The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 56
ium,is the one mostly used; butthe No. 1, or largest size, is frequently employed for the working of transmitters withmuch advantage, as they are heavily worked, and a greaterbody of depolarising material is desirable, and more solutionto keep up its strength. A stronger current is also obtained,as… … WW Fig. 17 34 PRACTICAL TELEPHONE HANDBOOK porous pot and its resistance, a mixture of carbon and bin-oxide of manganese is solidified by being crushed and mixedwith a proportion of gum-lac resin. The resulting compoundis put into moulds, and subjected to a great pressure, afterbeing heated to 212°…
Telephone
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