Popular Science Mouth ly 



A New Zinc Product Which Is 

 a Substitute for Tinfoil 



FROM Breslau, Germany, comes 

 a report of a substitute for 

 tinfoil which has been successfully 

 manufactured from zinc by a Ger- 

 man experimenter. The zinc prod- 

 uct is so similar in appearance 

 and general characteristics to the 

 tinfoil that the two are scarcely 

 distinguishable. The manufacturer 

 claims that the zinc foil will answer 

 every purpose for which tinfoil is 

 ordinarily employed. 



585 



This Tire Pump Gets Power 

 from the Engine Crankshaft 



AUTOMOBILISTS, take notice 

 l of the tire pump 

 illustrated. It fits any 

 make of car and particu- 

 larly cars which were not 

 originally fitted with power 

 tire-pumps under the en- 

 gine hoods. It is merely 

 slipped over the end of the 

 engine crankshaft extend- 

 ing out in front of the 

 radiator. By starting the 

 engine and attaching a 

 hose from the pump to the 

 nipple, the tire is inflated 

 in a few moments. This 

 done, the pump is removed just as easily 

 and put back in the tool box until required 

 again. 



It is impossible to pump oil into the tire 

 with the air. Oil rots rubber inner tubes. 

 No oil can find its way to the tire because a 

 tight, vibrating diaphragm is used. The 

 air is sucked in on one side of the diaphragm 

 and then forced out on the same side, in 

 which no oil is 

 used. There is 

 only one lubri- 

 cated part of 

 the pump, and 

 thatisthelower 

 end of the con- 

 necting rod 

 bearing which 

 causes the dia- 

 phragm to vi- 

 brate. This 

 bearing is oiled, 

 with grease 

 from an out- 

 side grease cup. 



At left: Part cross-sectional 

 view of the pump, showing the 

 cylinderlike casing with a rubber 

 diaphragm held between top and 

 cover. This diaphragm is vi- 

 brated up and down by means of 

 a lower semi-spherical cup fast- 

 ened to the top of an eccentric 

 connecting rod around the shaft 

 of the pump which is connected 

 with the engine crankshaft. The 

 air is sucked in through a small 

 valve in the cover on the down 

 stroke of the rod and forced out 

 on the upstroke as the diaphragm 

 is also forced up. A check valve 

 in the outlet valve prevents the 

 air from backing up. Above: 

 The pump in use on the car 



Moving Targets to Quicken the Eye 

 and Steady the Aim 



R! 1 



A hand pulley improvised from a bicycle wheel is 

 used to drive the target by means of a flexible cable 



lIFLE clubs are adopting the moving 

 field targets so popular in British 

 shooting ranges to quicken the eye and add 

 zest to rifle and revolver practice. 



The "deers" used are generally five feet 

 long and are constructed of heavy plaster- 

 board, painted 

 a light brown 

 and suspended 

 by two wires 

 which ride on a 

 trolley wire 

 which is 

 about thirty 

 yards in length. 

 The driving 

 power is fur- 

 nished by a 

 flexible cable 

 attached to the 

 front and rear 

 of the deer. 



