Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 102
pan, I have tosupport it every five feet, and this will necessitate an additional lengthof rope equal to 21 feet and costing $2.84, bringing the total cost ofrope to $24.84, while the No. 6 wire cost only 87 cents. If it is con-sidered that the post economized by the 20-foot span cost only 20cents,… … greater, and the advantages of my invention in using wires instead ofwire ropes or cables, unless compelled to do it, and in reducing thespans to 10 feet, are self-evident. I will now give a brief description of my elevated railroad or tram-way applied to mines. (Fig. 7.) It is built with only one…
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