254 



THE BOOK OP THE LANTERN. 



My slide-carrier consists of a piece of wood 7 inches long 

 and 4 inches wide, with a square opening in the centre to 

 receive the glass picture of the standard size, 3^ by 3 J 

 inches. This is faced on each side with a piece of card- 

 board, the opening of which is so much smaller as to form 

 a rebate in which the picture rests, and from which it 

 cannot fall out. 



And now to describe the method of manufacture. First 

 procure two pieces of sheet zinc, each measuring 7 by 4 inches 

 outside, but having openings of slightly different areas. 

 These are indicated in the annexed cut (fig. 66), the opening 



- *7J * 



FIG. 66. 



in one piece of zinc being shown by unbroken lines, and in 

 the other by dotted lines. It is best to make these patterns, 

 in the first instance, in thin card, and to hand them to a good 

 workman to copy in zinc. (I may mention in parenthesis 

 that here I found my chief difficulty. The average British 

 working man who has been brought up in the zinc industry 



