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 406
ds in frontof the Shield. 2. The Jack-screws. 3. The Top Staves, securingthe upper part of the excavationuntil the substitution of the brick-work : the sides of each divisionof the Shield were similarly de-fended. 4. Screws, to raise or depressthe top staves. 5. The Legs, being Jack-screws, fixed… … Section of the Thames-Tunnel Shield. GEOEGE STEPHENSON, THE EAILWAYENGINEEE. I:n- this practical age of physical comfort, it is scarcelypossible to overestimate the value and importance of therailway, and the services of its far-seeing originator,George Stephensois. It is not too much to say…
Inventions · Inventors
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
