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Scientific American, Vol. 61, No. 15 (1889) (1889)
leaf 3
d in its normal position by means of a thumb dotting with this machine pencil, an exact outline may piece, and when this section is removed, and the fold- ing arms turned down, so that the pintles enter the be readily obtained of any sketch in perspective it is desired to make. sockets in the sash,… … © 1889 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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