Q Amateur ■ 

 Eloctrician 



-koA Wii-eless Operator 



A Cleat for Holding Temporary 

 Electric Wires 



THE accompany illustration shows a 

 simple means for holding temporary 

 wiring in place. The cleat is nothing 



Glass push pins used as temporary cleats 

 for electric light and telephone wires 



more than the handy little glass push pin 

 that can be purchased at any stationery 

 store. It is very easy to attach, does not 

 mar the surface of the wall and, being 

 glass, is of course an insulator. The pin 

 is first forced into the wall and then the 

 double conductor cord is slipped over the 

 head. — Edward R. Cullen. 



An Electrically Driven Toy Tank 

 That Goes "over the Top" 



THIS caterpillar tank will crawl along 

 the ground, go "over the top" of 

 miniature trenches, plunge through wire 

 entanglements, and push aside or climb 

 anything that is in its path. It is a small 

 model of the latest machines that the 

 British Army has been using so success- 

 fully. 



Two side pieces cut from 3 4 -in. pine 

 wood in the shape of a diamond 12 in. 

 long, constitute the frame. At each cor- 

 ner of the frame a roller is placed. These 

 should be 6 in. long and 2 in. in diameter. 

 A small nail driven through the frame 



corner and into the center of the end of 

 the roller makes a shaft that is good 

 enough for the purpose. 



Now for the construction of the interior. 

 Between the bottom edge of the frame- 

 pieces a shelf should be nailed and upon 

 this fastened the batteries and an electric 

 motor, which will furnish the power. These 

 should be secured with screws so that 

 in case the tank tips over they will not be 

 jarred out of place. Belt the pulley of 

 the motor to the nearest roller and wire 

 the batteries to the motor. 



Over the four rollers a canvas or leather 

 belt is laced snugly. To keep from slip- 

 ping this belt should have several narrow 

 wood cleats nailed upon it. A small door 

 in the frame makes a convenient place to 

 get to the motor in order to turn on the 

 power, etc. It is evident that when the 

 current turns the motor that the rollers 

 will revolve, and, as the belt grips the 

 ground securely because of the cleats it 



A toy tank made of wood and inclosing a 

 motor and batteries for the power plant 



carries, the caterpillar tank will crawl 

 slowly along. The motor is of the small, 

 toy size; from 4 to 6 in. high being plenty 

 powerful enough. — F. E. Brimmer. 



947 



