Make a solution of Rochelle salt, 1 grain to the ounce of distilled water. Clean the plate of glass thoroughly with a little wet rouge and polish dry with a piece of chamois leather. Warm it before the fire or in the sun to about 70 to 80 deg. Fahr., and lay it on a perfectly level surface. Then mix 1 ounce of the silver solution with half an ounce of the Rochelle salt solution and pour the mixture on the glass so that every part of the surface will be evenly covered with it.
FIG. 7.—CURIOUS EFFECT OBTAINED WITH A CONVEX MIRROR.
Allow this to stand in the warm sunshine from half to one hour, when the reduced silver will be deposited as a fine film over the surface of the glass. When this is done wash off the glass with distilled water and wipe the entire surface very gently with a little wet wadding, which will take off the roughness and render it easier to polish. When perfectly dry the silver should be polished by rubbing with some smooth, hard surface. The plate is then varnished by pouring over it a suitable varnish and is ready for use.
[THE PHOTO-ANAMORPHOSIS.]
The name anamorphosis has been given to two kinds of pictures distorted according to a certain law, and which are of such a grotesque appearance that it is often impossible to recognize the subject of them; while viewed with proper apparatus they appear as perfectly correct images. One kind is designed to be viewed by reflection and the other is reconstituted by means of a special rotary apparatus.
FIG. 8.—ANAMORPHOSIS VIEWED IN CONVEX CYLINDRICAL MIRROR.[1]
[1] From "Experimental Science." Published by Munn & Co., New York.