SCREENS AND LANTERN ACCESSORIES 131 



lacing is required, but it may be advisable to tie the ends of 

 the bottom roller by pieces of twine to the floor. The ring 

 at one end of the top roller should always be tied with twine 

 to the line, to prevent the screen slipping about in raising or 

 lowering. Care is necessary in lowering, to let the two sides 

 down alike, a third person in the middle rolling up the screen 

 tightly as it descends. If the screen has to go on a wall, 

 three nails will be all that is required. 



A water-tight wrap of oil -cloth or macintosh should 

 always be provided for a screen of any kind, unless a sheet 

 packs in the lantern-box. 



Portable frames for erecting screens can be procured of all 

 opticians, but are most suitable for the smaller sizes (say 10 

 feet and under) in private rooms. A common form is shown 

 in fig. 70, the poles being built of three short pieces connected 

 by tubular sockets on the ends, so that 

 the stand for a twelve-feet screen will 

 pack into a case about 4^ feet long by 

 six inches square. These stands are 

 to be had fitted with pulley-rollers 

 at each corner, when they are equally 

 suitable for either a sheet or a paper- 

 faced screen ; the latter being simply 

 hung, while a sheet is first strained 

 over the pulleys, and then laced to the 

 poles by twine or tapes. FlQ . 70 



Another simple plan for elevating 



a roller screen, is to provide four pieces of pine-wood, each 

 7 feet or more long, and about 3x1 inches in section. Quarter- 

 inch holes are bored every three inches for a couple of feet from 

 each end, and four bolts with flange nuts are provided. Then 

 two of the pieces can be clamped together by two of the bolts, 

 so as to make one prop, and these props can either be simply 

 stood on end and secured by guy-ropes, or may be fitted into 

 base-pieces, or may be furnished with buttress pieces at the 



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