Stories of inventors and discoverers in science and the useful arts. A book for old and young (1860)
Timbs, John, 1801-1875 · New York, Harper & Brothers · leaf 119
PAEACHUTES. 115 scopic proportions: the rich combination of rays bursting throughclouds, and having the suns disk for their focus, contrasted withshadows upon the earth which radiate from a vanishing point on thehorizon, the narrow shadows of clouds and eminences, such as Harrowand Richmond, being…
Inventions · Inventors
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
