Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 500
cir-cuit, passing up through onewire and one blade of theplough to the motor; thence itreturns through the other bladeand wire to the power house.None of the current returnsthrough the rails or escapesthrough the ground. The pulleys shown (Fig.1133) are those belonging tothe cable traction, see… … Nfia Fig. 1139. ROOFS AND BRIDGES. At pages 490 and 1:91 will be found illustrations of the trussing of woodenbeams. These are simple forms, which may be used in roofs or bridges, andrules are given for the proportion of parts. Eolled I-beams or plate-girderswill serve also for floor-beams and…
Mechanical drawing
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