[Clarke, William], 1800-1838 · Boston, Munroe and Francis · leaf 118
g the side, a b, upward, look through atd, and you will have a brilliant symmet-rical repetition of the objects which areplaced between the two glasses and visibletlirough the angular aperture, ab c. Turnrotmd the cap, more or less, m which the objects are so placed, and youwill perceive a change… … 1 16 OPTICAL AMUSEMENTS. it in double and opposite oscillations. Standing still, however, the draughts-man may cop}^ oflf upon paper the shapes that present themselves, if hecannot hope to equal the varied tints, which are developed in succession jeach new one delighting the eye by the perfection…
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-102-239.webp)
