936 



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. 



