Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 333
be, of which the telescope body is formed,is such as is commonly used for rolling engravings for mail-ing. It is 3 inches external diameter and 32 inches long(about 4 inches shorter than the focal length of the objective).The exterior of the tube is covered with Java canvasattached by means of… … Easily Made Telescope. THE TELESCOPE. 3II The focusing tube, G, which is of brass, i^ inches inter-nal diameter and 11 inches long, is guided by a turnedwooden piece, H, fitted to the end of the pasteboard tube,D, and held by three or four ordinary round-headed wood-screws. The piece, H, has a…
Physics · Lantern projection · Electric apparatus and appliances
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep02muss-193-46.webp)
