Page:Popular Science Monthly Volume 90.djvu/952

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��Popular Science Monthly

��points on the base line E-F draw the Hnes up at right angles to the base line. Draw a line through the points on the bottom view and continue these lines up to the joint line at the top of the elevation "A." From the points where these lines touch the joint line draw lines at right angles the full length of the base line E-F. Now take a lead pencil and starting on point 9 on the bottom view follow the line up the eleva- tion, turning at the joint line, following it along until it crosses the line number 9, coming up from the base line. Make a cross at this point. Do the same for points 8 and 10, making a cross where the line crosses 8 and 10 lines coming up from the base line. Do the same for all the other points. Draw a curved line through all these crosses, and the pattern for section A is finished. Allow 3-16 in. extra stock for the seam at the edge. It will be noticed that the pattern for A is the same as for C. The curve is exactly the same for B and D, except that the seam is on the long part of the pipe. To get this pattern continue the number one lines from the base up to the points G and H. Connect these and you will have the pattern for parts B and D as indicated in the drawing. When the periscope is finished paint it a dull brown or other inconspicuous color.

��Large Paper Clip Used in Place of a Key Ring

WHILE it may not be quite as conve- nient as the circular key-ring for general use in the pocket, the pa- per-clip illustrated works very well and provides a very satisfactory means of holding keys together where they are to be hung up or kept in drawers. A box of them may be pur- chased for a few cents and in several sizes up to about 2 in.

The special kind of a clip shown makes an ex- ceedingly good key-holder for the reason that keys of different sizes may be kept separate on each end of the wire; or the latch key may be kept to itself on a separate section of the clip where it may be easily found in the dark. A small clip may be used to fasten the latchkey to the usual ring. — John D. Adams.

���Substitute for a key-ring

��A Telescoping Motorcycle Jack for Road Use

SOON after the purchase of my new motorcyle my tire went flat on the front wheel. It happened on a smooth stretch of state road. In looking about for

���Detail drawings of an easily made jack designed especially for use with the motorcycle

a stone large enough to place under the engine frame to raise the tire off the ground none was to be found. After a delay of about a half-hour I was under way again; but this taught me a lesson and I decided not to be caught in the same fix again.

I constructed a small telescoping jack, which I call the double lift. It fits very nicely in any of the tool boxes, measuring, when closed, 5^^ in. It has a maximum working height of 13 in. and weighs 2 lb. A small U-bolt is attached to the head of the jack for clamping it to the frame of the machine, directly under the engine. This clamping feature serves a double pur- pose; first, it keeps the machine from over- turning the jack, and second, when the machine is on an incline the jack can be locked to the machine at any angle.

The base of the jack is made solid so that it is dust and moisture-proof. This base part also serves as an emergency anvil for repairing a broken chain and the like. — ^JoHN F. Fetterly.

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