RECORD: Darwin, C. R. n.d. Imaginary angles. CUL-DAR51.A15. (John van Wyhe ed., 2002-. The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed and edited by John van Wyhe. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library & William Huxley Darwin.
A15
Imaginary Angles
3/4 / 1/4. = 90° /— 1/5 = 72°
1/6 = 60° / 2/7 = 108°.86' /
3/7 = 154.285 &c /
4/9 — protracted = 160°
real singles
all drawn
1/2 1/3 2/5 3/8 5/13 8/21 13/34 21/55
not drawn 34/89 not drawn 55/144
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 28 November, 2025