Page:Popular Science Monthly Volume 92.djvu/803

 �Q AmatGur ■ Electrician

��^d Wii-eless Operator

���A Clip for Removing Insulation from Wires Quickly

IN thf- accompanying sketch is shown a handy device for making the opera- tion of removing the cotton or other insulation from electrical conductors easy and efficient. The clip is very simple to make as it mere- ly consists of a piece of steel 1/16 in. thick and '^/i in. wide, bent into the required shape, as shown, then ground and tempered at the cutting edge. Triangular notches are ground or filed in the cutting edge before tempering, make the operation of pulling the insulating material from the wire easier. As a protection to the hand, it is ad\isable to cement or rivet a piece of leather to the strip. — Peter J. M. Clute.

��The sharp edge re- mo ves insulation quickly and evenly

��A Depth Indicator for a House Water Tank

THIS depth indicator was built to automatically gage the depth of water in a small house tank and was built entirely of odds and ends of the kind found about any work bench or household.

A drum was made of a cylindrical piece of wood 2 in. in diameter furnished with two rims of cigar-box wood 23-2 i^i- i^i diameter. The top rim was then cut down to the diameter of 2 in. except at one point where a tooth was left project- ing out 3<4 in. and about the same width, as shown at A.

A second disk 2^^ in. in diameter was then cut from cigar-box wood and its cir- cumference serrated with 13 teeth similar in size to that on A, and the space between

��them sufficiently wide to fit well over it.

The drum was then drilled through the center and mounted as shown on a solid base so to revolve easily about the screw in the center. The toothed disk was then glued to a length of a large spool to bring it in line with the tooth on A and mounted on a pivot so the teeth would engage readily without binding. The tooth disk was pivoted in the center of the base.

A card-board disk was then glued over the toothed disk, their centers being placed concentrically. This card-board disk was then pointed off with 13 equi- distant marks, each mark lying directly over a tooth of the gear underneath. They were then numbered from to 12,

���Dnun and float with an indicating wheel to

show the water level within a small tank

��the tank being 12 ft. in depth. A metal pointer was fastened to the top of the base so it pointed down and over the card- board dial as far as the numbers.

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