The Complete Work of Charles Darwin Online

RECORD: Darwin, C. R. [Materials with Darwin's achromatic microscope]. Whipple-Wh.3788.3. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the the Whipple Museum of the History of Science, University of Cambridge and William Huxley Darwin. With thanks to Tim Eggington.

An eye-piece micrometer is a glass disc that fits in the eye-piece of a microscope in order to measure the size of objects.

[1]

DESCRIPTION

OF THE

IMPROVED ACHROMATIC MICROSCOPE,

MADE BY

JAMES SMITH.

[2]

Directions for using the 1/8 in obj glass [...]

[3]

[4]

Micrometer

When 2 inch object glass is used pull out tube 2 inches & use either 1/100 or 1/200 of inch micrometer. It makes no difference which of its 2 eye-pieces are used

If 2/3 inch object glass is used pull out tube 3 1/2 / 10' of an inch.—

[5]

Micrometer

When 2 inch object glass is used pull up tube 2 inches & use either 1/100 or 1/200 of inch micrometer. It makes no difference which of the 2 eye-pieces are used

If 2/3 inch object glass is used pull out tube

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)