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A series of experiments relating to phosphori and the prismatic colours they are found to exhibit in the dark (1775)

Wilson, Benjamin, 1721-1788 · London : Printed for J. Dodsley ... T. Becket ... and G. Kearsley; Mess. Dollond ... and Mr. Smith ... opticians · leaf 144

An illustration from A series of experiments relating to phosphori and the prismatic colours they are found to exhibit in the dark, 1775, leaf 144
we obferve, fliould be conveyed from the full light into the dark place of obfervation with the utmoll fvviftnefs ; which cannot be performed unlefs the place of obfervation be very clofe to the full light. But in this cafe, how diall we avoid admitting fome portion of dight fufficient to difturb… … which was perpendicular. To the borders of the window were fixed two wings, and to the upper and lower borders were fixed two lifts : all of which were of fuch breadth, and fo adapted to the curvature of the drum, as to intercept fuch portion of the external light, as would otherwife have

Phosphors -- Early works to 1800 · Color · Phosphors

Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.

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