An Elementary Course of Civil Engineering for the Use of Cadets of the United St
An Elementary Course of Civil Engineering for the Use of Cadets of the United St
J B Junius Brutus Wheeler
The book An Elementary Course of Civil Engineering for the Use of Cadets of the United St was written by author J B Junius Brutus Wheeler Here you can read free online of An Elementary Course of Civil Engineering for the Use of Cadets of the United St book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Elementary Course of Civil Engineering for the Use of Cadets of the United St a good or bad book?
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>, knotted part between draughts. c, iron bolts with eyes let into oblique holes cut in the block. d and e, chain and rope tackling. III. By a simple contrivance made of three pieces of iron, called a lewis (Fig. 118), which has a dove-tail shape, with the larger end downwards, fitting in a hole of similar shape. The depth of the hole depends upon the weight and the kind of stone to be raised. The tapering side-pieces, n, n, of the lewis are inserted and placed against the sides of the hole ; t...he middle piece, 0, is then inserted and secured in its place by a pin. The stone is then safely hoisted, as it is impossible for the lewis to draw out of the hole. FlG. 118 Represents the com- FlG. 119 A line attached to mon iron lewis B. The straight piece, , admits n, n, side pieces of the lewis. Of the latter being drawn 0, centre piece of lewis, with out, allowing the piece, n, eye fastened to n, n by a bolt. To be removed. P, iron ring for attaching tackling. Where it may not be convenient to reach the pin after the stone has been placed in position, a lewis of the form shown in (Fig.
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