Illuminated Prospects





Provide yourself with some of those prints that are commonly used in

optical machines, printed on very thin white paper; taking care to

make choice of such as have the greatest effect from the manner in

which the objects are placed in perspective. Place one of these on the

borders of a frame, and paint it carefully with the most lively

colours, making use of none that are terrestrial. Observe to retouch

those parts several times where the engraving is strongest,[D] then

cut off the upper part or sky, and fix that on another frame.









The prints being thus prepared, place them in a box, A B C D, Figs. 14

and 15, the opening to which, E F G H, should be a little less than

the print. Cover this opening with a glass, and paint all the space

between that and the prints, which should be about two or three

inches, black. The frame that contains the sky should be about an inch

behind the other. In the back part of this box, which is behind the

prints, and which may be about four inches deep, place four or five

small candlesticks to hold wax lights, and cover that part entirely

with tin, that it may be the more luminous.



When the print is placed between the wax lights and the opening in the

front of the box, and there is no other light in the room, the effect

will be highly pleasing; especially if the lights are at a sufficient

distance from each other, and not too strong, that they may not

occasion any blots in the print. Those prints that represent the

rising or setting of the sun will have a very picturesque appearance.

Such as represent conflagrations have also a striking effect.



There should be two grooves for the print next the glass, that you may

insert a second subject before you draw away the first; and that the

lights in the back of the box may not be discovered.



You must not, thinking to make the print more transparent, cover it

with varnish; for that will prevent the gradation of the colours from

being visible. The frame should enter the side of the box by a groove,

that a variety of subjects may be introduced.



[D] When you colour a print, place it before you, against a

piece of glass, in a position nearly erect, that it may be

enlightened by the sun. You may also colour both sides of the

print.









EXPERIMENTS IN MAGNETISM.





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