The conductivity apparatus is a display of ten panels of diodes which light up from left to right with increasing degrees of conductivity of the solutions, and is very effective in the lecture setting ...

The conductivity apparatus is a display of ten panels of diodes which light up from left to right with increasing degrees of conductivity of the solutions, and is very effective in the lecture setting ...

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he therefore proceeded to ascertain what alteration in conductivity took place when the water was rendered air-free. For this end he employed a glass apparatus resembling in construction the so ...