RECORD: Darwin, C. R. n.d. Real [angle diagrams: 2/5 and 5/13]. CUL-DAR51.A22-A23. (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 and William Huxley Darwin.

A22

[sketch]

X

    10    9

8    7    6

   5    4

3    2    1

Real    2/5

A23

X

[sketch]

       14

   13    12

11    10    9x

   8    7    x

6    5    4

   3    2    1

1    X

    1

5/13    Real

A23

1/3    2/5 = 4/10

8/22

 

 3/10 x 360 [=] 108

 

2/7

Return to homepage

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

File last updated 28 November, 2025