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 298
HHscherZch. Instrument lor plotting points by their rectangular co-ordinates. Mayalso be employed for the construction of curves with given ordinates. (2) The Payne-Coradi Parabolograph. Exhibited by G. Coradi, Zurich. … (Designed by Professor Henry Payne in Melbourne.) 270 SECTION G (3) A Roller Protractor. By A. Ott, Kempten, Bavaria. This protractor consists essentially of a graduated rule, which may berotated about one extremity on the drawing board, and further, of a measur-ing roller running on the paper.…
