4 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 c, 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. 



THE VERTICAL ATTACHMENr. 



It is often very desirable to project such phenomena 

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



