Educational woodworking for home and school (1908)
Park, Joseph C. (Joseph Charles), b. 1872 · New York, The Macmillan company · leaf 311
Involute on a line. … Involute on a square. Constant (equable) spiral. (Spiral of Archimedes)AB ABetc=« radius vector. Variable (geometric) spiral. i. Circle in centre is the eye) Pitch-V- Fig. 259. — Curves and spirals.
Woodwork (Manual training)
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
