Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 129
Fig. iZ.—Pit-Saw. … -^■1&< Fig. 39.—Box Tunnel. RAILWAYS. TOWARDS the end of last century, tramways formed by laying downnarrow plates of iron, were in use at mines and collieries in severalparts of England, These plates had usually a projection or flange on theinner edge, thus— u, in order to keep the waggons…
Inventions
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