ells Professor Christlieb, of Bonn, gives the following statistics There are telephones and telephones, but in the host of showing the magnitude of the trade and its effects upon of gravity battery being connected with the transmitter. . If instruments so named the successful ones may be counted an… … long, and is made slightly convex and very smooth at the Fig. 1-SIMPLE TELEPHONE. upon the fingers of one hand. Of telephonic receivers it may as well be said there are but two, for there are only two principles involved in their construction. Of transmitters there are but two that have gained any…
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