|
|
JJ wrote:
Richard Clark wrote: On Tue, 13 Apr 2004 01:52:22 +0000 (UTC), wrote: Utter nonsense. Hi Jim, I've performed work with Battelle Centers for Public Health Research & Evaluation and this very matter has been studied to record and verify every statement I've offered. 73's Richard Clark, KB7QHC Well, I used to play with blobs of mercury a lot when I was a kid and it has never eeefffffecttted (snort)mmmmeee a (slobber) biiiittt. Good one, JJ! 8^) Mercury isn't very harmful by that route of exposure. You could polish quite a few dimes if you like, and not suffer much if any damage through skin absorption. But! Inhaling the fumes is another thing entirely. Mercurey poisoning has been known about for a long time now. Daggureotypists in the early 1800's often suffered from mercury poisoning as they purposely fumed the image plates to develop the images, producing a silver amalgam on the surface in accordance with how much it had been exposed to light. A beautiful but deadly process. The feltmaking process used to use mercury as a preservative, and the saying "mad as a hatter" was coined for a reason. And yet we still have people today that think that caution in handling mercury is some kind of "liberal" plot or something. - Mike KB3EIA - |
On Tue, 13 Apr 2004 15:34:36 -0400, Mike Coslo wrote:
Inhaling the fumes is another thing entirely. Mercurey poisoning has been known about for a long time now. Daggureotypists in the early 1800's often suffered from mercury poisoning as they purposely fumed the image plates to develop the images, producing a silver amalgam on the surface in accordance with how much it had been exposed to light. A beautiful but deadly process. The feltmaking process used to use mercury as a preservative, and the saying "mad as a hatter" was coined for a reason. And yet we still have people today that think that caution in handling mercury is some kind of "liberal" plot or something. Over time, it is a self-correcting problem. Holding it in your hands is more of an issue if A) you have some sort of wound, and some could contact your bloodstream, or more likely B) if you do not _thoroughly_ clean it off your hands before touching food, rubbing your eyes, smoking a ciggie, etc. Happy trails, Gary (net.yogi.bear) ------------------------------------------------ at the 51st percentile of ursine intelligence Gary D. Schwartz, Needham, MA, USA Please reply to: garyDOTschwartzATpoboxDOTcom |
None of this means you should get your panties in a wad because there is
a mercury wetted relay in the house. In the mid 80s I was involved in the start up of a 100KW photovoltaic demonstration project. I worked for an electric utility, and they wanted to show how great amorphous silicon solar cells were, so they could manufacture and sell them. The PV array was capable of 300VDC at around 350 amps at high noon on the 4th of July in the deep south. The array fed 4 25KW inverters which converted all that DC into 480 VAC 60HZ which was put on the power grid. The interrupters, or circuit breakers to the inverters were Mercury wetted contactors. The guy that designed the inverters used the AC interrupting rating of the contactors. The PV array was capable of more than double the DC interrupting rating of the contactors resulting in 4 exploded Mercury wetted contactors. The inverters had problems which resulted in full load rejection during start up. Well, the exploded contactors produced an abundance of mercury vapor as well as little blobs of the stuff all over the floor in the inverter building. This just about closed down the whole 1.4 million project, because a lot of folks got their panties in a wad. As for me, I went around sucking it up with a suction tube, putting it in a bottle for future use in antenna projects. 73 Gary N4AST |
On Tue, 13 Apr 2004 21:24:26 GMT, Gary S. Idontwantspam@net wrote:
Holding it in your hands is more of an issue if A) you have some sort of wound, and some could contact your bloodstream, or more likely Mercury can be forced through a solid plate of steel. Such is its ability to migrate through barriers. B) if you do not _thoroughly_ clean it off your hands before touching food, rubbing your eyes, smoking a ciggie, etc. Hi Gary, I just attended a Nanotech seminar presentation 4 hours ago on "The Collapse of Langmuir Monolayers" that showed the human body has roughly 2M² of skin surface area, OR 100M² of Lung surface area, OR 300M² of Gastro Intestinal surface area. The later two have a monomolecular air/water interface - the Langmuir layer. The decay products of nuclear breakdown (the electron emission) is no hazard due to its inability to puncture the dermal layer - inside the body it leads to chromosomal breakdowns that gives rise to cancerous growths. Same vector, two different paths separated by lack of caution in the errant belief about exposure levels leads to grief. [Another lesson learned in close proximity to the Boomers, and 24 Nuclear warheads stored within 10 feet of my workbench aboard ship.] 73's Richard Clark, KB7QHC |
"Richard Clark" wrote
Another point of toxicity. Because the nuclear "Boomers" contained a closed loop environmental system, ALL such batteries were banned from the boat irrespective of their need in ANY equipment. We had to make do with substitutes and jury rig our own holders or means to provide a voltage for key equipment that would work fine on surface craft. What are you talking about Richard? Just what kind of "jury rigging" did you do on "your" boomer? Jack Launch Operations Supervisior, Weapons Power PO, QA Inspector USS Andrew Jackson SSBN 619 (Gold) 1983-1987 |
On Tue, 13 Apr 2004 19:58:17 -0400, "Jack Painter"
wrote: "Richard Clark" wrote Another point of toxicity. Because the nuclear "Boomers" contained a closed loop environmental system, ALL such batteries were banned from the boat irrespective of their need in ANY equipment. We had to make do with substitutes and jury rig our own holders or means to provide a voltage for key equipment that would work fine on surface craft. What are you talking about Richard? Just what kind of "jury rigging" did you do on "your" boomer? Jack Launch Operations Supervisior, Weapons Power PO, QA Inspector USS Andrew Jackson SSBN 619 (Gold) 1983-1987 Hi Jack, They were ALL my Boomers (COMSUBLANT Charleston). USS Holland AS-32 Fleet Electronics Calibration Laboratory (Repair Services division). Battery holders for test equipment that took only one particular shaped coin cell (the mercury cells in commercial gear). They were usually bias voltages for specialized test equipment (maybe torpedo sonar test sets, but recollection is hazy in the particulars; coulda been crypto gear with RAM). I am well aware that mods were frowned on, but our shop had special dispensations from the Pope. No one argued authority with us who wanted to ship out (and we did get our quota of those who "just had to" lose a fight). I do know it wasn't for the nuclear pile sensor. They hauled me outa the rack at midnight to take over measuring at least 10 GigOhms because all they could muster up was a reading of 20X10^9 Ohms. I was puzzled why they needed less and they explained "their" dictionary described Billion as a million, million. I told them that was the british Billion but only after proving it to their Captain - the sub wasn't going to cast off without that check item and there was a lot of brass looking over our shoulders as I balanced the bridge. As it was in the common passage way to Sherwood Forest, someone invariable had to clamber past and would peg the meter for a minute or two. After about an hour I got back to my rack. I really did like the Diesel Boats better. 73's Richard Clark, KB7QHC, ET1, HMFIC, Uncle Sam's Canoe Club, 1968-1975 |
Salt water is a better idea,
not near as harmful, still a liquid, easy to mix one up at Home and extremely low cost, (at least the salt water) more transparent "Reg Edwards" wrote in message ... Why not use salt water. Anything will work. Loss resistance would not be too bad because skin depth increases with conductor resistivity relative to copper. |
"Richard Clark" wrote in message
... On Tue, 13 Apr 2004 19:58:17 -0400, "Jack Painter" wrote: "Richard Clark" wrote Another point of toxicity. Because the nuclear "Boomers" contained a closed loop environmental system, ALL such batteries were banned from the boat irrespective of their need in ANY equipment. We had to make do with substitutes and jury rig our own holders or means to provide a voltage for key equipment that would work fine on surface craft. What are you talking about Richard? Just what kind of "jury rigging" did you do on "your" boomer? Jack Launch Operations Supervisior, Weapons Power PO, QA Inspector USS Andrew Jackson SSBN 619 (Gold) 1983-1987 Hi Jack, They were ALL my Boomers (COMSUBLANT Charleston). USS Holland AS-32 Fleet Electronics Calibration Laboratory (Repair Services division). Battery holders for test equipment that took only one particular shaped coin cell (the mercury cells in commercial gear). They were usually bias voltages for specialized test equipment (maybe torpedo sonar test sets, but recollection is hazy in the particulars; coulda been crypto gear with RAM). I am well aware that mods were frowned on, but our shop had special dispensations from the Pope. No one argued authority with us who wanted to ship out (and we did get our quota of those who "just had to" lose a fight). I do know it wasn't for the nuclear pile sensor. They hauled me outa the rack at midnight to take over measuring at least 10 GigOhms because all they could muster up was a reading of 20X10^9 Ohms. I was puzzled why they needed less and they explained "their" dictionary described Billion as a million, million. I told them that was the british Billion but only after proving it to their Captain - the sub wasn't going to cast off without that check item and there was a lot of brass looking over our shoulders as I balanced the bridge. As it was in the common passage way to Sherwood Forest, someone invariable had to clamber past and would peg the meter for a minute or two. After about an hour I got back to my rack. I really did like the Diesel Boats better. 73's Richard Clark, KB7QHC, ET1, HMFIC, Uncle Sam's Canoe Club, 1968-1975 Richard, The Tender crews in Scotland hated all submariners, no exceptions. We thought they especially hated us but I think it was universal. Maybe because when it was time to get underway we used questionable tactics to separate the materials we needed from the Tender's inventory w/o always using the proper channels, shall we say. If they could've put mercury in our coffee they would've. 73's Jack 'slept three feet from a loaded bird and 30 feet from the teakettle. |
Mike Coslo wrote:
Good one, JJ! 8^) Mercury isn't very harmful by that route of exposure. You could polish quite a few dimes if you like, and not suffer much if any damage through skin absorption. But! Inhaling the fumes is another thing entirely. Mercurey poisoning has been known about for a long time now. Daggureotypists in the early 1800's often suffered from mercury poisoning as they purposely fumed the image plates to develop the images, producing a silver amalgam on the surface in accordance with how much it had been exposed to light. A beautiful but deadly process. The feltmaking process used to use mercury as a preservative, and the saying "mad as a hatter" was coined for a reason. And yet we still have people today that think that caution in handling mercury is some kind of "liberal" plot or something. - Mike KB3EIA - Umm, no, most people today think standing over a vat of heated murcury or chewing on something impregnated with mercury is not a very good idea. That doesn't mean you ignore the hazards or go screaming in terror just because you see mercury. -- Jim Pennino Remove -spam-sux to reply. |
Mike Coslo wrote:
wrote: Utter nonsense. Ever hear "The poison is in the dose"? There is some amount of every element in your body, including mercury, plutonium, arsenic and anything else you care to name. Hmmm, number 2 element shouldn't be in anyone's body. It is an artificially produced element, and if it does enter the body, it's characteristics make the consequences are particularly nasty. And it doesn't take much at all to produce that nastiness. - Mike KB3EIA - Want to bet if you can find an instrument that can see a single atom in a body you won't find at least one atom of every element in most people's bodies? -- Jim Pennino Remove -spam-sux to reply. |
Jim wrote, Mike Coslo wrote: wrote: Utter nonsense. Ever hear "The poison is in the dose"? There is some amount of every element in your body, including mercury, plutonium, arsenic and anything else you care to name. Hmmm, number 2 element shouldn't be in anyone's body. It is an artificially produced element, and if it does enter the body, it's characteristics make the consequences are particularly nasty. And it doesn't take much at all to produce that nastiness. - Mike KB3EIA - Want to bet if you can find an instrument that can see a single atom in a body you won't find at least one atom of every element in most people's bodies? -- Jim Pennino It's a mistake to conclude there is at least one atom of every element in most people's bodies without experimental proof. This is getting dangerously close to a you-cain't-prove-it-ain't type of argument. 73, Tom Donaly, KA6RUH |
Tdonaly wrote:
Jim wrote, Want to bet if you can find an instrument that can see a single atom in a body you won't find at least one atom of every element in most people's bodies? -- Jim Pennino It's a mistake to conclude there is at least one atom of every element in most people's bodies without experimental proof. This is getting dangerously close to a you-cain't-prove-it-ain't type of argument. 73, Tom Donaly, KA6RUH Since there 59 of the elements measurable with current (as of 1998) technology, I think this would be a pretty sure bet. See http://web2.iadfw.net/uthman/elements_of_body.html for a pretty good list. -- Jim Pennino Remove -spam-sux to reply. |
Dave Platt wrote:
There was a running gag over in rec.audio.high-end a few years ago, about the ultimate speaker cables: mercury-filled surgical rubber tubing. That's exactly what I thought of when I saw this subject line. For those who missed it in 1987: http://tinyurl.com/ywjd8 My favorite response in that 17-year-old thread: I can see the review by Anthony Cordesman now: "This wire lends a liquid transparency to strings. The fluid quality of horns has to be heard to be believed. There is a silvery quality to the brass, with no sign of the hard-edged, coppery sound normally associated with speaker cable... 73, John NU3E |
On Wed, 14 Apr 2004 21:28:07 -0400, John DeGood wrote:
Dave Platt wrote: There was a running gag over in rec.audio.high-end a few years ago, about the ultimate speaker cables: mercury-filled surgical rubber tubing. That's exactly what I thought of when I saw this subject line. For those who missed it in 1987: http://tinyurl.com/ywjd8 My favorite response in that 17-year-old thread: I can see the review by Anthony Cordesman now: "This wire lends a liquid transparency to strings. The fluid quality of horns has to be heard to be believed. There is a silvery quality to the brass, with no sign of the hard-edged, coppery sound normally associated with speaker cable... A fine example of what Herb Caen, in the SF Chronicle, used to refer to as "the prismatic luminescence school of wine critics". |
Has anyone actually tried it yet?
Considering only a drop in a neon sign or vapor lamp makes the difference between not working at radiating a tremendous amount of energy, it's worth a few careful experiments. |
|
On Thu, 15 Apr 2004 20:42:02 -0400, Bob wrote:
Has anyone actually tried it yet? Considering only a drop in a neon sign or vapor lamp makes the difference between not working at radiating a tremendous amount of energy, it's worth a few careful experiments. haha, good joke. Advertizing Yagi "Neon" tube arrays as STEALTH antennas. Your are beating my own inventions of crazy antenna designs. Won't work too well actually, at least not for reception, because the irregular flickering of the plasma will induce a very large amount of noise. w. -- On the Internet nobody knows that I am a dog. |
I was not suggesting using an entire neon sign or vapor lamp as an
antenna. I was pointing out 'the presence of a tiny drop of mercury' is required for these devices to work. A catalyst perhaps? Therefore, let's say our antenna was a piece of wire or metal tubing was inside another non-metallic tube, and a small amount of mercury was also in the tube. Would the mercury have a desirable effect? Remember, we're not talking about tremendous amounts of power here. Your typical 4' fluorescent tube is a 32 to 40 watt device, and there are much lower output tubes as well. The primary excitation inside the tube is due to high voltage, not high current. So, it may not be too far fetched to build a few designs and see what performance is observed. |
Bob wrote:
I was not suggesting using an entire neon sign or vapor lamp as an antenna. I was pointing out 'the presence of a tiny drop of mercury' is required for these devices to work. A catalyst perhaps? Therefore, let's say our antenna was a piece of wire or metal tubing was inside another non-metallic tube, and a small amount of mercury was also in the tube. Would the mercury have a desirable effect? Remember, we're not talking about tremendous amounts of power here. Your typical 4' fluorescent tube is a 32 to 40 watt device, and there are much lower output tubes as well. The primary excitation inside the tube is due to high voltage, not high current. So, it may not be too far fetched to build a few designs and see what performance is observed. Both neon and fluorescent lights work in basically the same way; something is ionized with high voltage and low pressure and glows. Neon lights produce light directly from the gas. The color is determined by the gas. Common gases are neon, argon and krypton. Fluorescent lights have mercury vapor in them which glows in the ultraviolet. The inside of the tube is coated with a phosphor which glows in the visible region when excited by the UV. Black lights are fluorescent lights without the phosphor. In either case, the voltage is high and the current is low, meaning the resistance is high; hardly a good canidate for an antenna element. Not to mention the small problem that your antenna would contain a spark gap... -- Jim Pennino Remove -spam-sux to reply. |
On Sat, 17 Apr 2004 15:21:14 +0000 (UTC),
wrote: Not to mention the small problem that your antenna would contain a spark gap... Hi Jim, 100 years ago they all did. And of course, the bands weren't as crowded then (and VHF started around 2 or 3 MC). Who would have thought.... 73's Richard Clark, KB7QHC |
First thought is that it would heat up and detune itself. But this would
only be a problem on transmission and if the tube holding the mecury was very thin. Conductivity of mercury is not so great compared to more traditionally used metals but this should not be significant compared to the radiation resistance of most antennas. "Cecil Moore" wrote in message ... Forget about the feasibility of this question for the moment. Could a column of mercury inside a tube of glass be used as an antenna? -- 73, Cecil, W5DXP -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
On Sun, 18 Apr 2004 18:04:22 GMT, "Jimmy"
wrote: First thought is that it would heat up and detune itself. But this would only be a problem on transmission and if the tube holding the mecury was very thin. Conductivity of mercury is not so great compared to more traditionally used metals but this should not be significant compared to the radiation resistance of most antennas. Hi Jimmy, There are so many things wrong with this sentiment.... For one, this "tube of mercury" (that everyone takes for granted) to be "tuned" by temperature would have an exceedingly small capillary (my lab models are easily less than 1mm). Second, constructions of wavelengths longer than for 2M are laughable (but then, so is the entire concept). You could never support the column within it as it would draw a vacuum in its collapse under the influence of gravity (AKA barometer). Try to counter that with a thinner capillary (anyone see where this is going in comparison to radiation resistance?) and almost any heat expansion will rift the enclosure. When do we get to depleted uranium elements that pre-ionize the æther around them for "matching?" Will it escape the notice of many that we would have to then abide by exposure rules from both the FCC and the Nuclear Regulatory Agency? Or even the NIH? 73's Richard Clark, KB7QHC |
Richard Clark wrote:
Second, constructions of wavelengths longer than for 2M are laughable ... For a horizontal antenna??? -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
On Sun, 18 Apr 2004 14:41:28 -0500, Cecil Moore
wrote: Richard Clark wrote: Second, constructions of wavelengths longer than for 2M are laughable ... For a horizontal antenna??? keep the chuckles comin' |
Richard Clark wrote:
wrote: Richard Clark wrote: Second, constructions of wavelengths longer than for 2M are laughable ... For a horizontal antenna??? keep the chuckles comin' You know I don't care for verticals. :-) -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
That IS funny!!!
Everybody knows vertical mercury antennas perform better than horizontal ones!!! ;-) |
Most certainly idle minds will play...
"Richard Clark" wrote in message ... Hi Jimmy, There are so many things wrong with this sentiment.... Well, since I have a rather large container of the stuff (a couple of lbs) looking at me all the time on top of my o-scope, it sure is tempting .... just to say it was done... ...You could never support the column within it as it would draw a vacuum in its collapse under the influence of gravity (AKA barometer). OOPS. Tilt... Er...uh. Don't build it like that. Cap the bottom to fix this. Leave a little air/vacuum/(a.k.a. mercury vapor) on top if you must use a glass tube. .... I wonder what kind of tubing I have around here... -- Steve N, K,9;d, c. i My email has no u's. |
Steve Nosko wrote:
Most certainly idle minds will play... "Richard Clark" wrote: ...You could never support the column within it as it would draw a vacuum in its collapse under the influence of gravity (AKA barometer). OOPS. Tilt... Er...uh. Don't build it like that. "Tilt" is very good advice for a variable mercury column. In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Cecil Moore wrote: Steve Nosko wrote: Most certainly idle minds will play... "Richard Clark" wrote: ...You could never support the column within it as it would draw a vacuum in its collapse under the influence of gravity (AKA barometer). OOPS. Tilt... Er...uh. Don't build it like that. "Tilt" is very good advice for a variable mercury column. In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. -- 73, Cecil http://www.qsl.net/w5dxp How much does the length change when you tilt it at 45 degrees? ac6xg |
On Tue, 20 Apr 2004 12:41:55 -0500, "Steve Nosko"
wrote: Cap the bottom to fix this. Leave a little air/vacuum/(a.k.a. mercury vapor) on top if you must use a glass tube. Hi Steve, It doesn't work that way. The mercury will create its own void - thing called gravity and the pressure of the atmosphere around us are in competition (even if the tube is sealed). Fill it to absolute capacity (no reservoir) and you will either pop the tube (thing called thermal expansion) or draw a vacuum. Pressure, gravity, temperature - all things mercury is sensitive to. It would be easier to herd cats. 73's Richard Clark, KB7QHC |
On Tue, 20 Apr 2004 13:05:32 -0700, Jim Kelley
wrote: In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. -- 73, Cecil http://www.qsl.net/w5dxp How much does the length change when you tilt it at 45 degrees? Hi Jim, Look at it from either end and it is only a millimeter long. More new physics of antennas (optics based too). 73's Richard Clark, KB7QHC |
Jim Kelley wrote:
Cecil Moore wrote: "Tilt" is very good advice for a variable mercury column. In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. How much does the length change when you tilt it at 45 degrees? By the factor of the square root of two. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Cecil Moore wrote: Jim Kelley wrote: Cecil Moore wrote: "Tilt" is very good advice for a variable mercury column. In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. How much does the length change when you tilt it at 45 degrees? By the factor of the square root of two. Sounds kinda like one of those mythical cable stretchers. :-) ac6xg |
Jim Kelley wrote:
Cecil Moore wrote: Jim Kelley wrote: How much does the length change when you tilt it at 45 degrees? By the factor of the square root of two. Sounds kinda like one of those mythical cable stretchers. :-) By Golly, I have been looking for a cable stretcher. A tilted mercury column will perform that function. Question is, what do I mix with the mercury column to make it more conductive? -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Cecil Moore wrote:
Jim Kelley wrote: Cecil Moore wrote: Jim Kelley wrote: How much does the length change when you tilt it at 45 degrees? By the factor of the square root of two. Sounds kinda like one of those mythical cable stretchers. :-) By Golly, I have been looking for a cable stretcher. A tilted mercury column will perform that function. How so? Question is, what do I mix with the mercury column to make it more conductive? Maybe it'll superconduct if it gets cold enough. :-) 73, ac6xg |
Jim Kelley wrote:
Cecil Moore wrote: By Golly, I have been looking for a cable stretcher. A tilted mercury column will perform that function. How so? The gravity vector remains constant while the tilted mercury vector varies with the angle of the tilt. Let's say theta is the angle of the tilt, i.e. the angle between the mercury column and the ground plane. At an angle of 45 degrees, the mercury column length will be 1.414 times the length at 90 degrees, At 10 degrees, the mercury column length will be 5.76 times the length at 90 degrees. That sounds like something worth patenting. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Cecil, are you thinking of an open ended tube of Hg with a variable
supply of Hg?? My days with Hg manometers comes to mind. If it's a closed tube then the length does not change with angle. So, you can have your variable length antenna and not have it too!! Deacon Dave Cecil Moore wrote: Jim Kelley wrote: Cecil Moore wrote: "Tilt" is very good advice for a variable mercury column. In fact, the tuning length of the column of mercury could be controlled simply by tilting the tube of mercury at an angle away from vertical in the direction of horizontal. How much does the length change when you tilt it at 45 degrees? By the factor of the square root of two. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
David.Shrader wrote:
If it's a closed tube then the length does not change with angle. I may be wrong, cuz I'm not very mechanical, but it seems to me that a column of mercury in a tube with a vacuum at the top and a reservoir of mercury at the bottom would change height of column depending on the angle of the column's deviation from vertical. It seems to me that when the column is horizontal, there would be no vacuum at all in the tube. -- 73, Cecil http://www.qsl.net/w5dxp -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
Cecil Moore wrote:
Forget about the feasibility of this question for the moment. Could a column of mercury inside a tube of glass be used as an antenna? -- 73, Cecil, W5DXP -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- It's probably been mentioned before, but there is a group that has covered liquid antennas in great detail. See - http://groups.yahoo.com/group/Live-Wire/ Most of the liquid antennas are salt water based, but the idea is the same. Tom K0TAR, ex WA2PHW lots_of_email_addresses@I_already_get_enough_spam. com |
| All times are GMT +1. The time now is 06:58 AM. |
Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
RadioBanter.com