Practical perspective : being a course of lessons, exhibiting easy and concise rules for drawing justly all sorts of objects : adapted to the use of schools (1776)

Clarke, Henry, 1743-1818, Nourse, Charles, 1713 or 1714-1789, Murray, John, 1737-1793 · London : Printed for the author, and sold by Mr. Nourse, in the Strand, and Mr. Murray, no. 32, in Fleet-Street · leaf 73

An illustration from Practical perspective : being a course of lessons, exhibiting easy and concise rules for drawing justly all sorts of objects : adapted to the use of schools, 1776, leaf 73

Perspective · Mechanical drawing

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$An illustration from Perspectiva horaria sive de horographia gnomonica tum theoretica, tum practica libri quatuor : in quibus gnomonices antiqui fines latius protenduntur: traditurque ratio, & delineatio geometrica expeditissima non solum communium, quae radio directo vel umbra pariter directa; sed etiam aliorum novae inventionis solarium horariorum, quae radio vel umbra tum reflexis tum refractis horas, aliaque ad coelestium motuum notitiam pertinentia indicant : in his vero praecipuam admirationem habet thaumantias catoptrica atque dioptrica, id est reflexus, ac refractusa speculo cylindrico solaris radius, omnes, qui in sphaera cogitari possunt, circulos gnomonice reddens iridis modo ac specie : lux quoque secundum propriam naturam sumpta suas ibi habet partes, ubi e principiis eius physicis ratio redditur reflexionum, ac refractionum eiusdem consequitur vero methodus certissima telescopium efficiendi non modo sphaericum sed etiam hyperbolicum atque ellipticum (1648)$