Popular Science Montkhj 



84.'J 



The doors of large public garages have 

 to be opened very frequently and at all 

 hours of the day or night. This neces- 

 sitates constant attendance upon them. 

 The device shown 

 in one of the illus- 

 trations enables t he 

 clerk or stenogra- 

 pher in the garage 

 office to open or 

 close the heavy gar- 

 age doors without 

 leaving her desk, 

 simply by pressing 

 a button. The de- 

 vice consists of a 

 small electric mo- 

 tor geared to a 

 cable-drum. The current is controlled 

 through a set of push buttons and a relay. 

 When the starting button is pressed, 

 the current is sent through the motor 

 which operates the drum and, by winding 

 up the cable, pulls open the door 

 until a metal contact on the door 

 itself comes into play against a 

 switch-bar, supported by the small 

 overhead frame that carries the 

 motor. This shuts oflf the 

 current and leaves the door 

 open. To close it, a second 

 button is pushed and the 

 door is closed in the 

 reversed order, with a simi- 

 lar switch to shut off the 

 current when the door is 

 closed. 



It is self-evident that the 

 ease with which large doors 



This garage has folding doors that slide in 

 grooves and require little "elbow room" 



may be operated depends primarily upon 

 the nicety with which all parts are fitted 

 and upon the quality of the materials 

 used. An ounce of prevention being worth 

 a pound of cure, it 

 would be poor 

 economy to resort 

 to inferior labor or 

 material to save a 

 few dollars on the 

 initial expense, 

 only to have to 

 pay a repairman a 

 more or less heavy 

 bill after a short 

 time. 



This sliding garage door swings around the 

 comer and requires very little inside space 



An Automobile that Got Its Power 

 from the Street Mains 



AN automobile provided with a com- 

 ^ pressing plant by means of which 

 gas could be taken from mains 

 in the streets and compressed 

 into the cylinders, in which it 

 was stored as fuel 

 for the machine, is 

 the work of W. H. 

 Dunkley of Bir- 

 mingham, Ala. The 

 plan included the 

 employment of 

 charging stations 

 erected in the 

 streets. Payment 

 for the gas could 

 have been made by 

 means of slot me- 

 ters and gas pass 

 keys. 



The Dunkley 

 automobile was 

 made in the early 

 days of the use of 

 coal-gas as a fuel 

 for machines. It 

 had a twin-cylinder 

 opposed horizontal engine and the port- 

 able gas compressor was made up of two 

 water-cooled cylinders at right angles 

 to and above the power cylinders. The 

 cylinders in which the gas was stored 

 were of the standard type used for oxygen. 

 An idea for fitting hollow disk wheels 

 as auxiliary reservoirs for gas was also 

 evolved by Mr. Dunkley. 



D i f f er ent 

 styles of roll- 

 ers that are 

 used for the 

 sliding doors 

 of garages 



