latform re- to position, and the glass plate is lowered into this for about made of sheet zinc, and are controlled from both sides of the volves upon aline roller frame of 43 feet diameter. It stands ninety seconds. At the expiration of this period it is removed; apparatus by the strings, F, by… … The frame is then adjusted until a clear image of the object ter, the plate is finally lowered and washed. Nothing fur- 2 R ther remains to be done but the usual finishing treatment. Patented in the United States; Great Britain, France, and Belgium through the Scientific American Patent Agency. For…
Patents · Improved · Iron · Apparatus · Centennial · Scientific American · Address · York city · Mount washington · Horse power · Lightning rod · Find directions · American supplement · Sulphurous acid · Address munn · Ellis island
Internet Archive · Public domain (published before 1931). Free to use for anything.
