On the carbon piles for the automatic voltage regulator.

Abstract

The properties of the carbon pile are mentioned here. The resistance R is approximately given in the form R=nC/P^m; where n is the number of carbon piles C & m are the constants and P is the applied force. The resistance of the carbon pile having 1/N times the above area can be calculated by the formula R= (nCN^1-m) /P^m. If we decrease the compressive force from the maximum value P_max to the lower value P. then the car bon discs expand by the amount χ. There exists the following relation between them; P=P_max10^-χ/nk, where k is a constant. And the method of measuring the resistivity, perpendicular to the surface is mentioned.