The Viaduct Works' Handbook
Forfatter: Henry N. Maynard
År: 1868
Forlag: E. And F. N. Spon
Sted: London
Sider: 108
UDK: 624.3
Being A Collection Of Examples From Actual Practice Of Viaducts, Bridges, Roofs, And Other Structures In Iron; Together With Tables Of Prices, Weights, And Other Information Useful To Engineers In Design And Estimating Wrought And Cast-Iron Work
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driven through the lot, at any hole, with a light hand hammer. In
the bridge before referred to, for which Messrs. Kennard made these
machines, the flanges of the girders have as many as six thicknesses
of -inch plates; and all the diagonal bars are drilled, some of them
requiring very intricate patterns, and special machines were made for
each different pattern.
Crabs, Pulley Blocks, and Lifting Tackle. The accom-
panying illustration represents a double-purchase crab. The prices
of single and double purchase crabs are approximately as under :—
DOUBLE PURCHASE CRAB
Jawau
=
Each.
0
0
10
10
0
0
0
0
£8
12
3
6
Double purchase, 3 tons
» » 6 »
Single purchase, 1 ton
„ 2 ,, •
Best make Pulley Blocks, with turned pins, and pulleys all
turned and bored :—