Way back in the 1970's I visited the National Physical Laboratory (NPL) at
Teddington, West London.

I was priviledged to see, but not to touch, the National Standards of the
Ohm and of the Volt. There were a number of 4-terminal resistors submerged
in a temperature-controlled oil bath. There was about a dozen Western Cells
with connecting wires submerged in another temperature-controlled oil bath.
There were small fans in the oil to ensure a very slow circulation.

I asked my guide, the physicist responsible for maintaining these vital
standards of measurement on which the Commercial, Industrial, Engineering,
Scientific life of the Nation is supported, what special sort of oil was
used in the baths?

He said it was the same stuff, without the perfume, as young men used for
hair oil and came from a tree in Malaya.
----
Reg, G4FGQ

Reg Edwards wrote:
Way back in the 1970's I visited the National Physical Laboratory (NPL) at
Teddington, West London.

I was priviledged to see, but not to touch, the National Standards of the
Ohm and of the Volt. There were a number of 4-terminal resistors submerged
in a temperature-controlled oil bath. There was about a dozen Western Cells

Is that something like a Weston Cell?

On a serious note, don't overlook refrigeration oils, they are high
quality, light, dry oils for immersed motor windings, and available in
smaller sealed tins (around 5 litres).

Owen

Jav...

I've had one for about 30 years, run everything from an 80m Kallyfornia Kilowatt
to a 1 watt aircraft transmitter into nothing more than K-mart automatic
transmission fluid. Excellent results.

BTW, read your local paper when it lists the 150+ people running for governor.
Expecially read the last names beginning with W {;-)

Jim


Javier Henderson
shared these priceless pearls of wisdom:

-I got a Heathkit Cantenna recently, sans oil.
-
-Where do I find transformer oil? The few industrial suppliers in my
-area (Monterey, CA) want to sell me drums of the stuff. I only need
-a gallon...
-
-Is motor oil OK to use?
-
-73,
--jav w6vms

Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup

Jim Weir writes:

I've had one for about 30 years, run everything from an 80m Kallyfornia Kilowatt
to a 1 watt aircraft transmitter into nothing more than K-mart automatic
transmission fluid. Excellent results.

Excellent. I -may- have to make-do with WalMart's brand, but we'll see.

BTW, read your local paper when it lists the 150+ people running for governor.
Expecially read the last names beginning with W {;-)

I already sent in my dollar.

Go Jim!

-jav