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Civil engineer and architect's journal (1837)
London : Published for the proprietor · leaf 374
pon, a circular holeis generally dug in the ground, about six or eight feet deep, and five or sixfeet wide. In the centre of this bole the boring is carried on by two work-men below, assisted by a labourer above, as shown in Jig. 27. The handle [Jig. 28) having a female scr. w in the bottom of its… … : A.:- .. 33 34 28 © ^n_f attached. A chisel (Jig. 29) is first employed, and connected to this handleby its screw at top. If the ground is tolerably soft, the weight of the twoworkmen bearing upon the cross bar, and occasionally forcing it round,will soon cause the chisel to penetrate ; but if the…Civil engineering · Architecture
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