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The microscopic cabinet of select animated objects : with a description of the jewel and doublet microscope, test objects, &c. to which are subjoined, memoirs on the verification of microscopic phenomena, and an exact method of appreciating the quality of microscopes and engiscopes by C.R. Goring (1832)

Pritchard, Andrew, 1804-1882, Goring, C. R., 1792-1840, Kelsall, W.H., fl. 1834-1860, engraver ill · London : Whittaker, Treacher, and Arnot, Ave-Maria-Lane · leaf 229

An illustration from The microscopic cabinet of select animated objects : with a description of the jewel and doublet microscope, test objects, &c. to which are subjoined, memoirs on the verification of microscopic phenomena, and an exact method of appreciating the quality of microscopes and engiscopes by C.R. Goring, 1832, leaf 229
C F its axis,directed so far on one side of a candle A, placed at afew yards distant, that the light of it shall bisect thefield of view vertically, leaving half of it dark : thenC being the focus of the object-glass, is to form a pivot,round which the body is to revolve horizontally to theother… … and the axis of the body into the line C G. The spacetravelled over by the body from F to G is the angle ofaperture j in the present case equal to 60°, for it isevident by construction that the angles DCE andE C H are equal to the angle F C G made equalto 60°. MICROSCOPIC CABINET. 223 DESCRIPTION…

Microscopy

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