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Re: adding a layer of some other fluid on top

Posted by 1973shovel (A) on May 13, 2007 at 02:16:15

In Reply to: A thought... posted by mosin on May 12, 2007 at 20:09:26:

Although your idea of topping the mercury with something like oil might work to keep the fumes in, it would also render the arm useless.

After the wells are filled with mercury, the arm wand is placed on top of the upward facing male pivot. The wand portion of the arm has four pins which are submerged into the four mercury baths. If the mercury had any type of oil floating on top, the moment you placed the wand in place, the pins would become coated with oil as they passed through it and would no longer conduct a signal.

I used to own one of these arms. Even the oxidation "scum" which formed on the surface of the mercury would eventually cause a loss of signal from one channel or the other. Cleaning would always restore the signal, but it was a pain, not to mention the health concerns.

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