It was a small drawing of a suspension bridge:
The 1873 letter accompanying the drawing reads: "Enclosed please find rough sketch, which will give you an idea how to construct a cheap susp. bridge. The price of 2" diameter steel rope is 15 cents per foot. If you conclude to build, and should want more information, we will gladly give it."
I have no idea why Crane & Co. would have been considering building a suspension bridge, but if they had they would have gotten their information from the best in the business: John A. Roebling's Sons. If you don't know the Roebling story, have a look here.
they had line, ruled notebook paper back in 1873???
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