Studies on Carbon Powder for Transmitter

Onthe Surface Dirt of Carbon Powder

Abstract

This paper is concerned with the relation between the surface dirt of carbon powder and the properties of its for telephone transmitter.
The figure of deposited carbon and degree of surface dirt are tested with microscopic and suspended powder on ethylalcohol, and the coefficient of friction are measured with packing percentage of transmitter at constant vibration and time,
The results oftained are as follows.
1) The efficiency of carbon powder and its coefficient of friction are dependent on the degree of surface dirt and no dirt carfon is most desirable.
2) The degree of surface dirt are dependent on the volume of pyrolysis gas, carrier gas and its contents, the materials of vessel and its structure.
The carbon surfae is lesser dirt, if the heat treatment temperature of carrier gas, town gas, is higher.
3) The figure of deposited carbon become clear by the microscopic photograph.