40 



THE ART OF PROJECTING. 



inches in diameter, with a focus of from eighteen to 

 twenty-four inches, will be found best for the purpose. 



This may be held in the re- 

 tort-holder before mentioned, 

 and set at such a distance in 

 front of the hole that an ob- 

 ject <r, when strongly lighted,, 

 will be plainly projected upon 

 the screen s. The whole of 

 the back on the in side should 

 be covered with white paper. 

 Let a black cloth flap hang 

 over the hole at r, so that no 

 light will enter the room, save 

 what is reflected from the il- 

 luminated object. 



With these conditions a 

 dark photograph of an in- 

 dividual, upon a white background, will show quite 

 well. Objects held in the hand, such as a watch with 

 its movements, cameo pins, small flowers, surface of 

 half an apple or orange. The latter, if squeezed when 

 being shown, presents a very amusing appearance. 

 Minerals, crystals, shells, bright-colored beetles, bugs, 

 butterflies, etc., may all be exhibited, and appear, with 

 the shades and shadows, like real objects. This con- 

 stitutes the megascope. 



The accompanying cut ( Fig. 24 ) represents the 

 scenic effect of the human hand, as projected by the 

 megascope. it- 



Fig. 23. 



THE VERTICAL ATTACHMENT. 



It is often very desirable to project such phenomena 

 as the ripples upon the surface of water, the move- 



