146 



Popular Science Monthly 



Meeting ra 



A Simple Cold -Weather Ventilator 

 for the Window Sill 



FOR very cold days, when drafts would 

 be objectionable, the simple ventila- 

 tion device shown in the drawing will be 



appreciated 

 by everyone. 

 Yit a board 

 1 in. thick, 

 13^^ in. wide 

 and 4 in. long 

 by hinges to 

 the stool of the 

 window, re- 

 bating the top 

 so that when 

 the board is 

 set vertically 

 it will hold 

 the lower sash 

 of the window 

 up. This per- 

 mits the air 

 to come in be- 

 tween the up- 

 per and lower 

 sash without 

 at the bottom 

 The bottom 

 also 



Hinged board under 

 lower sash to raise 

 window for ventilation 



IS 



draft, while the opening 



is closed with the board. 



of this board, as will be seen, 



rebated to fit over the stool. 



When the window is to be closed the 

 board is pulled over into the flat position 

 on the window stool. The hinges should 

 not be set flush into the stool and board, 

 because extra play is needed for it to fall 

 into position. The ventilation afforded 

 between the two sashes is sufficient for 

 ordinary purposes on cold and windy 

 days. — Harold V. Walsh. 



Joining Pieces of Rubber by the 

 Use of Heat and a Glass Rod 



IN the chemical laboratory small 

 pieces of tubing are often discarded 

 because a satisfactory method of uniting 

 them to form a larger piece is not known. 

 With a glass rod which fits the tubing a 

 very good joint can be made. The rod 

 should first be wound around with paper 

 and then inserted in the tubing. Before 

 applying the tubing to the flame, pow- 

 dered soapstone or talcum should be 

 sifted through the tube to prevent the 

 rubber from adhering to the rod or paper. 



Using a Bugle to Transmit 

 Telegraph Signals 



Almost every person is familiar with 

 l\. the idea of sending messages by 

 the wigwag system of flags, but here 

 is a code by which messages may be 

 transmitted within the range of a bugle 



sound by quarter and half notes. There 

 is not anything difficult about the code 

 and it can be learned almost as quickly 

 as the bugle calls. — Thomas McHugh. 



A Waterproof Mounting for a Circular 

 Piece of Glass 



AVERY good method of securing a 

 circular piece of glass in a metal 

 frame, and at the same time making it 

 waterproof, is shown in the illustration. 



The circular piece of glass is shown 

 at A, and at B is shown a rubber band 

 stretched around the glass, dividing it 

 evenly on both sides. At C the iron case 



A rubber band stretched over the edge 

 of the glass ai\d pressed in the metal rim 



in which glass is set is shown, and D 

 shows the metal rim, screwed down by 

 machine screws, which exerts a pressure 

 on the rubber band, thereby securing 

 and waterproofing the glass. The rubber 

 band surpasses putty, felt, etc., in neat- 

 ness and durability.— Walter B. Weber. 



