Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 396
n can in a few hours learnto use the whole apparatus, while it is calculated that the expense of con-struction and working would not be above half of that incurred for theelectric system. For telegraphs in houses, ships, warehouses, and shortlines, this invention will doubtless prove very…
Inventions
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