Identifier: philtrans04725543 (find matches)
Title: Sketches and Descriptions of Three Simple Instruments for Drawing Architecture and Machinery in Perspective. By Mr. James Peacock; Communicated by Robert Mylne, Esq. F.R.S.
Year: 1785 (1780s)
Authors: Peacock, J. Mylne, R.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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are to move with moderate eafein a rebated or dove-tail brafs groove in the middle of theblade of the fquare; upon the back of the groove AD are to befixed two brafs pins QQ, to reft: in proper holes, fimilar tothe holes marked RR; and the fame kind of holes are to be madein the corner of the board whereon the copy is to be made. To ufc the Machine* Having placed the board ABCD in a truly vertical pofition,fix the fhifting groove AD in the rebate, on the moft conve-nient fide of the board, by means of entering the pins Qintothe holes R; then loofen the fcrew O, and move the ftockIK, and at the fame time turn the blade PL upon its center Pfuntil one of its edges fhall be coincident with fome originalline; then fix the ftock by turning the fcrew G j move thepoints M and N, till they exaftly include the apparent length ofthe faid line* then take off the fhifting groove AD, togetherwith the T fquare or bevil fixed thereto^ and apply the fame to the PtHlos.Ttwt*. Vo/.LXXV. Tab .XUI./a 370
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