A Process for the Manufacture of Heating Conductors for Thermic Telephones from Wires Manufactured by the Wollaston Process.

摘要

5835. Naamlooze Vennootschap de Nederlandsche Thermo - Telephoon Maatschappij. Feb. 9, [Convention date]. Reducing size by chemical action.-In method of producing filaments for thermic telephones by the Wollaston process, the shaped composite wire is subjected to the action of acid vapours instead of liquid to corrode the outer metal coating.