Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 209
). 180 SECTION F (18) Exhibit of Slide Rules. By A. G. Thornton, Limited (Manchester). The case contains the following rules, which are all faced with celluloidand have aluminium glass cursors :— i. Perry Patent Slide Rule. No. 6957. 10 inches long, 1^ incheswide, with scale, inches, and fiftieths… … [To face p. 38. Section G OTHER MATHEMATICAL LABORATORY INSTRUMENTS I. Integraphs. By Charles Tweeuie, M.A. § I. An Integraph may be briefly described as an apparatus for solvinggraphically a differential equation of the type /(*•■* £)-° w dxJ The machines invented naturally furnish solutions only…
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