Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 84
logarithm of a number multiply Its common logarithm by 2.3026.= In circular measure 3G0° = 2 IT r which for r = 1 becomes 6,28318; 180° = 3.14159; 90o = 1.5708; 60 =0..J236 ; 1 ° = 0.0174533. . 1.0472 ; 45 o = 0.7854 ; 30 ° : TEE HYPERBOLIC SPIRAL.—THE L ITU US. 77 radius vector, a some nmiierical… … To construct the spiral fi-om its equation take 0 as the pole (Fig. 126): OQ as the initial line: a for convenience, some fi-action, as -: and as our unit some quantitv. say half an inch, that will 4 make - of convenient size. Then taking Q 0 as the initial line make 0 P = - = 2 and draw PRa a…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
