Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 494
Fig. 3070, weighing 3 qrs. 22 lbs., shows the sha])e adapted for railway signal-posU; and fig. 3071,weighing 2 qrs. 4 lbs., that for tiie supports for the wires of the electric telegraph. For these pm-posesthe screw-points must be very useful, as independent of the economy of labor in putting them…
Mechanical engineering · Mechanics · Engineering
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