Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 637
Fig. 302^5,—Bells Musical Telephone. in both cases, the reader will find his advantage in following the observa-tions we have to make on the earlier instrument. This consisted of whatwas virtually two sets of electric tuning forks, each set being acted uponTsy one electro-magnet. Fig. 302^ will…
Inventions
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