Excerpt from The Botanical Gazette, Vol. 34: July-December, 1902
The capacity of the electrolytic cell must first be determined. This is done by introducing in the cell a solution of known spe cific conductivity. For this purpose a normal solution of potassium chloride was used, and the thermostat was kept at a temperature of 25 C. This was the temperature at which all subsequent measurements were made, the uniform temperature being necessary, since the conductivity of electrolytes varies with the temperature. After closing the circuit and starting the coil, the movable contact (jig. I, d) is pushed along the gradu ated resistance ab until the minimum for the telephone is found. The resistances are then in the following rati0'
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