Popular Science Monthly 



315 



How to Make a Snow-plow to 

 Clean the Sidewalk 



THE plow is built on a lawn mower. 

 the blades of which have been re- 

 moved. In the drawing the plow is made 

 from a shovel. One of the halves is put 

 on each side and brought to a point in 

 front. The frame is made of one board 

 about V X 12" or two boards 1" x 6". 



This snow-plow is made from a lawn mower 

 from which the blades have been removed 



As the sizes of lawn mowers vary, so 

 will the plow have to vary to fit. The 

 cross-bar is the width and thickness of 

 iho. handle of the mower, and can be ad- 

 justed. It keeps the nose of the plow 

 on the ground. 



A Clock Light for Dark Mornings 



A BOY of fourteen, who has had 

 no instruction in electricity, and 

 whose home in a little Iowa town has 

 no electric service, invented the device 

 illustrated. In this home, early rising- 

 is the rule, partly from necessity and 

 partly from choice. In the winter time, 

 when the days are short, he must rise 

 before there is much daylight. This 

 arrangement enables his father or 



mother to illuminate the dial of a clock 

 and to see what time it is without get- 

 ting up. 



As the diagram shows, tw^o dry bat- 

 teries are connected in series and put 

 into a little wooden box, on top of 

 which the clock rests. To the back of 

 the box is fastened a light bracket 

 made of strips of soft wood. This 

 bracket overhangs the clock, and to 

 its underside is fastened a three-volt 

 searchlight bulb in a minature base. 

 From one pole of the battery a wire 

 is run down behind the dresser, under 

 the carpet to the bed, up one of the 

 bedposts, to a height about a foot above 

 the mattress. Here a push-button is 

 attached. The return wire goes back 

 over the same route, up behind the dress- 

 er to the lamp, and from the lamp to the 

 other pole of the battery. Hanging in 

 front of the lamp is a little piece of tin 

 bent so as to make a crude reflector, r.t 



When the lid is lowered the switch automatic- 

 ally closes the circuit and lights the desk lamp 



A push button beside the bed allows the boy to 

 see what time it is without getting up 



the same time that it serves to keep the 

 light of the lamp out of the observers' 

 eyes. By pushing the button the dial is 

 illuminated, and the occupant of the bed 

 can read the time without rising. 



An Automatic Desk Lamp 



A CONVENIENT automatic desk 

 light may be easily constructed 

 from two pieces of thin brass, a small 

 light bulb with socket, and a dry battery. 

 A piece of brass is screwed to the desk 

 lid, as shown, and the other piece is fast- 

 ened underneath it, so that when the lid 

 is lowered the two pieces close the cir- 

 cuit to light the lamp. A switch may 

 be placed in circuit so that the lid may 

 be lowered without lighting the lamp. 

 The wires are placed as illustrated. 



