Page:Popular Science Monthly Volume 92.djvu/162

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��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

��A J-

�N JJi

�1 IJ}^} eiJJJJ

�D iJJ^J*

�JJi

�a iJiJJ 7 iJJJj

�c JJJJ

�P JiJ,J

�3 iJ^JJJ 8 iijjj

�D iiJ

�Q iJJJ

�4 JJ-JJJ 9 JJJ'JJ

�£ J

�R JJJ

�SJJJJJ J J JJJ

�F jiJi

�' \i

�iTART 0FME55A6E J

�6 JJ

�7 ii

�END OF WORD. PAU5E

�H iJj

�u JiJJ

�CL05E OF ME55A0E J Hl(3f1 NOTE

�1 JiJ

�V JiJJ

� �J JJJJ

�w iJJJ

� �K Jii

�t iiiJ

�Code for use in

�L jJ '

�Y JiJj

�sending signals

�MiJJ

�Z JJJJ

�by tjugle call

��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.

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