RECORD: Darwin, C. R. 'Cell from opposite angle to angle' (nd) CUL-DAR48.B15-17 Transcribed by Kees Rookmaaker (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Kees Rookmaaker, corrections and editing against the manuscript by John van Wyhe 7-11.2010. RN1

NOTE: Editorial symbols used in the transcription:
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Text in small red font is a hyperlink or notes added by the editors.

Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.


[15]

cell from opposite angle to angle measures 50/200 = 5/20 = 1/4 of inch.

including 1/2 thickness of walls of 2 angles. —

From edge of base [sketch]

42.5/200

Thickness of walls of prism 1/400 of inch of pyramidal basis 1/200!

giving edge of comb about 10/200 or fr 7/200 to 15/200

ink on cream coloured paper, verso blank.

[16]

1 6/10 & have breadth tube drawn out with 2 inch glass [2 words illeg]

Each division of 1/100 micrometer equal 1/200 of inch — so the

20/200 = 1/10 of inch.

The edge of pyramidal basis = 31/200 of inch.

Edge of one side of Hexagon eque 28/200. but these proportions makes measures & the arms for lens with section difficult

10/200

Weak eye piece. 2 inch object but drawn at t.5 (sharing line of 5 with 1/100 minute) equals 1/200 of inch.

page in pencil, grey blue paper.

Weak...1/200 of inch.] in ink.

[16 verso]

1 inch onject 2 eye piece

tube-diam at 3 inch & 1/10

with 1/100 micrometer, I

I find 10 of this micrometer = 5/200 of an inch or 1/40. = [crossed out] . = = 25/1000 of an inch

Hence 5 of the dimensions will equal 5/100 = 1/20 of an inch

1/20 5/100

20/200 10/100 1/40 x 3/100

page in pencil.

[17]

As thickness of well included may be too small

Radius of Hexagon . . 125
Add for radius of spheres . 028
[totals] .153 x

Induction of 2 spheres 1.4142 [x] .153 [=] 42426 70710 14142.. [=] .2163726

Distance of space is [illeg] Bee cells by calculation = 42/200

page in pencil on grey blue paper, verso blank.


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

File last updated 2 July, 2012