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



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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



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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



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Cecil,

Could you clarify the dimensions of your column? Because the only
portion of a cylinder of Hg that would lengthen is the tiny portion at
the tip of the cylinder. Let's say the inner diameter of the tube was 1"
(kind of thick for a tube of Hg, but makes for really easy math here...
If the column of Hg was 4'long by 1" diameter, tilting it to a 45
degree off vertical would only allow the volume residing at the very end
to tilt (occupying 1" of cylinder length) and yes, it would (begging the
question it had no surface tension) find level again and the bottom
edge, effectively lengthening the metallic column by (1.414 * n) where
'n' is the affected volume. (roughly a length of column equal to the
diameter of the column) Our 4' column would only lengthen to about 4'
plus approx 1/2 an inch. The rest of the column is effectively captive
to the inner dimensions (and volume) of the vessel containing it.

Bob.




Cecil Moore wrote:

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



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Cecil Moore wrote:

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.

I saw a further explanation in your later post. Important point - the
resevoir, open to air or a source of constant pressure for example. As
you tilt the vertical section, the height above ground remains constant
because it is balanced by the pressure on the reservoir. In order to
maintain the height above ground as the column is being tilted, the
column must increase in length.

It works beautifully by the way, Cecil. I just tried it with a mercury
barometer.
73, Jim AC6XG

On Wed, 21 Apr 2004 14:17:14 -0700, Jim Kelley
wrote:

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?

Pascal's law.

wrote:

On Wed, 21 Apr 2004 14:17:14 -0700, Jim Kelley
wrote:

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?

Pascal's law.

Are you implying that any and every column of mercury must obey Pascal's
law?

73, ac6xg

On Mon, 26 Apr 2004 09:57:59 -0700, Jim Kelley
wrote:

How so?

Pascal's law.

Are you implying that any and every column of mercury must obey Pascal's
law?

Any column of any liquid should. Would you care to cite a
counter example?