fflpoaapii^r '.;..;'; ' ; ~~~~y . jp.' : pJfl^Pi 



An Automatic Automobile Jack An Alarm Watch That Pinches 



Vise With a Swivel Base 



cushioned jacks with all wheels free to 

 be turned. To remove the car from the 

 jack, a foot trip is depressed, and the 

 car is gently backed down under its own 

 power. The weight of the car backing 

 out automatically resets the jacks. This 

 contrivance is of unusual interest when 

 it is remembered that only a fraction of 

 a second is required to jack up all four 

 wheels a feat accomplished with no ef- 

 fort on the part of the driver whatso- 

 ever. 



Ingenious Vise for Drill Presses 



A vise mounted on a swivel base, 

 which particularly adapts it for use in 

 connection with drill press and shaping 

 work, is one of the latest entries into the 

 hardware market. A swivel base of this 

 sort is a new feature in vises and one 

 that should be quickly appreciated by 

 tool makers and machinists. The swivel 

 base is easily locked into the desired po- 

 sition. The weight of the vise and swivel 

 is about thirteen and a half pounds. 



A Silent Alarm Clock 



Alarm watches that signal the time 

 for which they are set by a shrill ring- 

 ing are common, but a "noiseless" alarm 

 watch which accomplishes the same re- 

 sult is entirely new. 



The story has been told of a married 

 man who possessed a ringing alarm 

 watch and who, with his wife, was awak- 

 ened every morning by the silvery tinkle 

 of the watch under his pillow. It took 

 this man's wife five years, so the story 

 goes, to discover that the alarm watch 

 and not the neighbor's alarm clock was 

 really awakening her every morning. The 

 noiseless alarm watch, however, per- 

 forms its early morning task differently. 

 The noiseless alarm consists of a cord 

 which tightens about the wrist, the pres- 

 sure gradually increasing until released 

 by the wearer of the watch. This^ is 

 accomplished by pushing a small slide 

 and twisting the stem of the watch a 

 half turn. 



New Projecting Machine Averts 

 Rewinding 



The lost motion and the danger from 

 fire which are present in the usual mo- 

 tion picture projecting booth are entirely 

 eliminated in a new projecting machine 

 recently placed on the market. Rewind- 

 ing is unnecessary. The film, as it flows 

 past the condensing lenses, is wound in a 

 reel as usual. This results in the begin- 

 ning of the film being at the center of 

 the reel. Instead of rewinding, the film 

 is placed in a metal canister above the 

 shutter and the machine "threaded" 

 from the center of the reel. The ad- 

 vantages claimed for this new method, 

 aside from the labor saved in banishing 

 the task of rewinding, are that the op- 

 erator can give more attention to the 

 operation of his projector, the life of the 

 film is prolonged and the chances of a 

 film breaking because of tension are 

 greatly lowered. 



346 



