94 



THE BOOK OF THE LANTERN. 



proper sockets, and the top portion of the sheet is tied on by 

 tapes. It is reared up a little higher by the addition of two 

 more side pieces ; and as this building-up gradually goes on 

 the sides of the sheet are secured by tapes to the frame. The 





Fig, 37. 



bottom pieces are finally attached a.nd the frame is com- 

 plete. If there is room enough this operation of mounting 

 the sheet on its frame is best performed when both are 

 lying flat on the floor, otherwise it must be done by 

 gradually building up the frame while it is in a vertical 

 position. At each top corner should be fastened guy 

 ropes, and these can be secured to staples screwed into 

 the floor. 



One advantage of a frame of the above description is 

 that, when, from the nature o'f the hall, it must be erected 

 on a platform at a higher level than that of the lantern, 

 the whole screen can be made to incline forwards, so as 

 to bring its surface square with the lens. With a strictly 

 vertical sheet the picture would, under such circumstances, 

 be thrown out of shape and out of focus. 



Whatever wood may be chosen for the material of the 



