RECORD: Darwin, C. R. n.d. [Notes on using the mountain barometer] Barometer fall. CUL-DAR196.2.3. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed and edited by John van Wyhe 7.2022. RN1
NOTE: See Jones, Thomas. [1802]. A companion to the mountain barometer, consisting of tables, whereby the operation of computing heights with that instrument is rendered extremely simple and easy, whilst its accuracy is inferior to no other mode; together with a description and use of the englefield mountain barometer. 2d ed. with additions. London: Author. Text [Darwin's copy is in CUL-DAR196.2.2] Darwin took this with him on the voyage of the Beagle.
Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.
[3]
Barometer fall
When going up hill deduct, what Barom. has fallen from difference
When going down add difference what Barometer has fallen to difference
Vice Versa if Barometer is rising —
The apparent fall is different going up & down a hill
[3v]
(b) 29 when at 29
a 30 29.9
You start at 29 & find lower ones 29.8
When you start at (a) lower Barometer is 30. and upper one 29.1, but when you arrive it is 29.
When you start at (b) upper one 29. 29.9
29.1
29.9
30.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022