RECORD: Darwin, C. R. 4-5.1834. Geological diary: Barometrical Obser: for measurement of Valley of St. Cruz. CUL-DAR34.93-98. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Kees Rookmaaker, corrections and editing by John van Wyhe 3.2011. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. This document, part of the largest scientific document composed by Darwin during the voyage of the Beagle, is written mostly in ink. Marginal notes are here integrated into the text.
Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.
See the introduction to the Geological Diary by Gordon Chancellor.
93
(1)
[barometrical measurements, not transcribed]
April 25th [1834]. — noon cliff. — 2d highest plain.—1
1 The measurements in this document relate to entries in Darwin's Banda Oriental notebook, pp. 49ff taken in April and May 1834 during the expedition of the Santa Cruz river. The barometric measurements were used by Darwin to determine the altitude of successive parts of the team's ascent of the Santa Cruz valley. See the introduction to the Banda Oriental notebook.
(2)
[barometrical measurements, not transcribed]
April 26th [1834]. — (B) Low Lava cliff. there was one near it higher
(3)
[barometrical measurements, not transcribed]
April 26th [1834] (C) [high] plain back of (B
same height with north cliffs?
278 + 141 = 419
noon cliffs being 418
93 verso
Barometrical Obser: for measurement of Valley of St. Cruz & St. Cruz
94
(4)
[barometrical measurements, not transcribed]
April 26th [1834]
(E) high marine lava plain ∴ feet higher than (B) lava plain & 55 feet lower than great noon cliff plain
(5)
[barometrical measurements, not transcribed]
April 26th [1834]
Difference between lava plain (E) & line of springs probably showing thickness of lava 117. feet
(6)
[barometrical measurements, not transcribed]
April 26th [1834]
In order to verify thickness of lava, me measurement between its base & waters edge
262 + 117 = 379
High main lave plain being 383 feet. (only error of 4 feet)
94v [blank]
95
(7)
[barometrical measurements, not transcribed]
April 27th [1834]. —
Main lava plain supposed to be the same height as 383 plain, but turns out 49 feet. (+ rise in river higher)
measurement not good
(8)
[barometrical measurements, not transcribed]
April 27th [1834]
A little oval hill on lava plain, no doubt good measurement. As the hill represent a plain, its altitude will be 65+ 432 = 497.
(Yet I thought it same with with 383 plain!)
(9)
[barometrical measurements, not transcribed]
April 27th [1834]
From little hill to waters edge descending.. makes the lower plain lower by 38 feet! — —
(10)
[barometrical measurements, not transcribed]
April 27th [1834]
From little hill to waters edge (ascending)
Perhaps the mean will be most correct
479 feet little hill or plain ∴ 96 above noon cliff &c &c
95v [blank]
96
(11)
[barometrical measurements, not transcribed]
April 28th [1834]
(Z plain (But with captain)
(12)
[barometrical measurements, not transcribed]
April 28th [1834]
Hill called "Crater hill" elevation above (Z) plain 215 feet.
215 + 525 = 740 above the level of river
(13)
[barometrical measurements, not transcribed]
April 30th [1834]
Apparent height of oyster bed. & line of springs. in the cliffs. of the "section".
96v [blank]
97
28th [1834] + noon
[barometrical measurements, not transcribed]
May 3d. [1834] noon
Good measurement within half a day of highest point. —
[barometrical measurements, not transcribed]
97 verso
[barometrical measurements, not transcribed]
April 25 [1834] noon
[barometrical measurements, not transcribed]
[April] 26th [1834] sunset
allowing a difference of 10 degrees in A thermometer gives 27 feet +: (adding the (B) to log ß)
98
(14)
[barometrical measurements, not transcribed]
April 30th [1834]. —
Alluvial hill on lava. —
(15)
[barometrical measurements, not transcribed]
April 30th [1834].
Superior edge of lava ∴ 212 = thickness of alluvium & (1122—212)—587 (V 13) = thickness of lava = 323 feet
(16)
[barometrical measurements, not transcribed]
May (1st) [1834]
Old alluvial plain. Near head of river.
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022