送話器用炭素粉について
1953 年 3 巻 3-4 号 p. 81-84
詳細
1953 年 3 巻 3-4 号 p. 81-84
Carbonization process of anthracite was studied and the velocity of gas evolution was found to be approximated very well by Bangham's formula for the velocity of adsorption. Accurate method of measuring contact resistance of carbon powder was devised, whose error being within 3%. Deterioration processes of carbon powder due to mechanical shock, electrical spark, humidity, oxidation etc. were studied and discussed.
