How? or, Spare hours made profitable for boys and girls (1887)
Holbrook, Kennedy · New York, Worthington co. · leaf 152
remaining open space; the smaller part of the cover wasthen fastened on one side with small pieces of tape.When not in use, this little cover fell down over theglass, but when any object was to be viewed the little lidwas lifted into the position in the cut, and served as a … CAMERA OBSCURA. 149 shield to the ground glass beneath. A piece of blackcloth thrown over this cover, and allowed to fall over thetriangular side-openings, so as to still further preventoutside light from reaching the ground glass, is a greatimprovement. In the diagram, the dotted lines show the…
Handicraft · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The United States art directory and yearbook : [1st-2d year] : a guide for artists, art students, travellers, etc. (1888)](https://img.insideoutlibrary.com/img/200/ia-unitedstatesartd02koeh-330-59.webp)
