PROJECTIONS FOR THE SCHOOL-ROOM. 7 



pieces of equal length, and having the selvedges sewed 

 together, will make such a screen with but one seam. 

 That these edges may come together, but not lap, let 

 the sewing be done with what is called the carpet stitch. 

 Some loops of tape or small rings may be sewed into 

 the corners, and it may be- hung upon nails driven into 

 the wall at the proper places. 



It is often convenient to have the screen so mounted 

 as to permit it to be rolled up when not in use, and 

 various devices have been invented to effect this. Per- 

 haps the neatest is to have a roller at the top contain- 

 ing a strong spring, which is wound up when the screen 

 is pulled down, a large curtain fixture. A wooden 

 roller sixteen feet long is likely to sag in the middle, 

 unless it is made so large as to be cumbersome. It is 

 best to have one made of tin tube about three inches in 

 diameter. 



A screen can quickly be put up in any room by pro- 

 curing two strips of board, two or three inches broad, 

 and long enough to reach from the floor to the ceiling. 

 Fasten the sides of the screen to these, and then wedge 

 them tightly between the floor and the ceiling. A 

 portable frame which can be adjusted to various heights 

 may be made by having two such strips for each side : 

 one of them to be provided with a collar at its end for 

 the other to slide through, and to be made fast together 

 by a thumb-screw through the collar, as in the figure. 



This will permit one to adjust it to different heights to 

 its limit of eighteen or twenty feet, while by resting the 

 foot upon chairs or tables a still higher room would be 

 provided for. 



