My only gripe with his procedure is the use of ice and salt as the cooling medium. Dry ice can be purchased at several places- - - -our local WalMart sells it. Its temperature is something like -70 degrees F., and when Methanol (shellac thinner) is used as the liquid, it does a lot better job of condensing the liquid in the sensing bulb. Be careful when handling dry ice- - -use heavy gloves or you'll get frostbite on your fingers.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!