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St John's Library/Balls/E contains:
<-- See earlier
E5 Department of Scientific and Industrial Research, 'Report of second conference of research organisations. 12th December, 1919' (London: HMSO, 1920)
E6 'The nature, scope, and difficulties of industrial research. With particular reference to the cotton industry'
E7 'The Egyptian cotton crop from 1898 to 1921'
E8 'The existence of daily growth-rings in the cell wall of cotton hairs'
E9 'Further observations on cell-wall structure as seen in cotton hairs'
E10 'The determiners of cellulose structure as seen in the cell-wall of cotton hairs'
E11 'Measurements of the reversing spiral in cotton hairs'
E12 'A simple apparatus for approximate harmonic analysis and for periodicity measurements'
E13 'Apparatus for determining the standard deviation mechanically'
E14 'The Mather Lecture. Current changes in the technology of cotton spinning and cultivation'
E15 'The practical application of agricultural research'
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Papers of William Lawrence Balls

Title 'Apparatus for determining the standard deviation mechanically'
Reference E13
Covering Dates 1922
Extent and Medium 9p; paper
Content and context

Communicated by G. Udny Yule. Received 6 March 1922. From 'Proceedings of the Royal Society' A. 101 (1922), 333-341.

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