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Scientific American, Vol. 41, No. 9 (1879) (1879)
leaf 7
two nuts. As the screw by this system travels rying a saddle for the support of the ledgers and framing, ranged in a circle around thearmature wheel. The construc- up With its scaffold, the same screws will do for any height from which the workmen’s platforms or scaffolds are suspend- tion is such… … 6 in. in height. way, N. J. SCREW SCAFFOLDING. . © 1879 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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