Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 407
ing mounted on a platform which can slide right across thecarriage, and thus the machine can be brought to work on any point of aheading. It is secured in position by means of a jack-screw in the top ofthe column ; and as the carriage is mounted on wheels, it is easily movedto permit of blasting.… … Fig. 182.—Burleigh Rock Drills mounted on a Carriage. The supports for the machines, four of which may be mounted at once, aretwo horizontal bars, the lower of which can be raised or lowered, as maybe necessary. The two parallel sides of the carriage are joined only at theupper side, and there is…
Inventions
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