Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 77
Bridge of steel pipe. 42 FORM-ARCHES are spiral instead of longitudinal. An eager quest for combinedstrength and lightness in the bicycle has ended in the choice oftubes spirally welded. … Arch bridge of steel pipe,Sudbury River, near Saxondale, Mass. Spiral fire-lighter.
Inventions · Inventors
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
