Popular Science Monthly 



CAl 



A Watch- Carrier for the Motorcycle 

 Handlebar 



EVERY motorcycle owner desires to 

 have a watch placed on his handle- 

 bar, but the cost of a good watch-holder 

 is entirely too expensive for the service 

 it gives. 



A thoroughly practical and easily con- 

 structed holder is made by removing the 

 back of the watch and boring two small 

 holes in it. A piece of nickel-plated 

 brass or tin is then cut in a strip I in. 

 wide and from 6 to 7 in. long, depending 

 on the diameter of the bar. Two small 

 holes are bored in the center of this 

 piece, coinciding with those bored in 

 the back of the watch, and out at each 

 end to receive a bolt and nut when bent 

 in a circular form. 



This piece is then united to the watch- 

 back and securely soldered. The watch- 

 back is then pressed back on the watch 

 and the metal strip curved around the 

 handlebar and a bolt run through the 

 two ends and tightened up, fastening it 

 securely. 



This makes a very attractive orna- 

 ment on the machine, as only the watch 

 itself is seen from the rider's seat. A 

 little shellac or solder should be used 

 when the watch-back is pressed on again 

 to insure its safetv. — N. S. Mc Ewen. 



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Operating the Oil-Pump of an 

 Automobile by Valve Action 



IT is seldom that the valves of an auto- 

 mobile engine are called upon to per- 

 form more than their usual function of 

 admitting the mi.xture to the cylinder 

 on the intake stroke and releasing the 



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The upward movement of the valve stem 

 and a strong spring operate the piston 



burnt gas on the exhaust stroke; but the 

 manufacturer of a new sight-feed oiler 

 for a well-known light car has made use 

 of one of the valves to actuate an easily- 

 applied oil-pump. 



The pump is operated directly from 

 the valve through a rocker-arm which is 

 raised with the \alve travel. The rocker- 

 arm is slotted to fit against the \alve- 

 stem between the valve-tappet and a 

 special washer, and is pivoted. The 

 upper end is in contact with the end of 

 the pump-piston, and the reciprocation 

 of this piston forces the oil to the en;^'ine. 

 The upward movement of the Naive- 

 stem causes the rocker-arm to mo\'e the 

 pump-piston outward, thus forcing oil 

 out of the little pump chamber. A 

 strong spring forces the piston back on 

 the downward valve-travel to suck oil 

 into the chamber and force it out on the 

 upward stroke of the vaK'e. Two simple 

 ball-valves direct the flow of the oil to 

 and from the pump. 



A metal strip is soldered to the watch 

 and then curved around the handlebar 



How to Make a Mallet from a Piece 

 of Broomstick 



A MALLET can be very easily 

 made by utilizing the remains of 

 an old broomstick. The stick of the 

 broom should be cut off to the length 

 desired (about the size of an ordinary 

 hammer). The head of the mallet is 

 cut from 4 in. square lumber, such as 

 oak or maple, or in fact any hard wood. 

 Drill a i-in. hole through the head. 



