Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 311
ose his efforts. Thequantity of matter to be shifted in excavating this trench of thirty-fivemiles long across the country was no less than sixty millions of tons. Thenumber of navvies employed at one time has been 15,000 ; but eventhis army of workmen would have made but slow progress with a… … Fig. 12)1 b. — 77/1? English Steam Navzry. navvies that were much used on the works. One (Fig. \2>7^) is similarto the dredgers used for clearing mud out of rivers and canals : it consistsof a series of scoops, or buckets, mounted on an endless chain, so as toscrape the material from an inclined…
Inventions
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