Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 397
Fig. 178.—The Sommeiller Boring Machines. ROCK BORING. A LLUSION has already been made to one great characteristic of our-^^ age, namely, the replacement, in every department of industry, ofmanual labour by machines. A brief notice of even the main features ofthe various contrivances which have…
Inventions
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