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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Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.
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]
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.
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
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.
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
20/200 10/100 1/40 x 3/100
page in pencil.
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