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Additional Plans for Aerial Ship Iron bridges with circular arc should have a rise of 1/10 the chord line, and a width of pier 1/10 of span Haswell p 474 Fig 1 [[image - drawing of bridge with circular arc]] [[solid line = 1 inch steel pipe [[dotted line]] = steel bracing wires Scale about 3/4 inch to 10 feet Base 70 ft, hight 12 ft, arch 74.24 ft long. Fig, 2 [[image - drawing of Floor, Same scale.]] Fig.3 [[image - drawing of Roof, Scale same.]] Fig 1 is a side elevation of the frame for the cabin. It is simply a very light bridge of 1 inch steel pipe, braced with 1/4 inch. ^[[Berlin June 5, 1883]]
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