Half-hours with the microscope; being a popular guide to the use of the microscope as a means of amusement and instruction (1863)
Lankester, Edwin, 1814-1874 · London, R. Hardwicke · leaf 35
d perforatedwith three or four cir-cular holes of varyingdiameter (^fig. 4), thelargest only being equalto the aperture in the stage. By turning the plateround, a succession of smaller openings is broughtinto the centre of the stage, and in one position ofthe diaphragm the light is totally… … Fiy. 4. Diaphragm. 10 THE STRUCTURE OF
Microscopy
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