98 



A Miner's Safety Electric Lamp 



OWING to the hazardous nature of 

 work in gaseous mines, a demand 

 has been growing for a practical, port- 

 able electric lamp. That an electric 

 lamp would be safe to use has been well 

 recognized, because 

 it would be made 

 so that it would 

 not ignite inflam- 

 mable gases and 

 would produce a 

 uniform light re- 

 gardless of atmos- 

 pheric conditions. 

 The perfection of 

 the efficient tungs- 

 ten lamp in minia- 

 ture sizes and the 

 devel'opment of 

 small, efficient, 

 light weight stor- 

 age batteries has 

 resulted in the design of the long-desired 

 miner's electric lamp. 



The prime feature of this lamp is that 

 it has been made thoroughly safe to 

 use. By adequate insulation of the en- 

 tire circuit, placing all terminals and 

 contacts inside of locked and sealed steel 

 cases and providing automatic means for 

 extinguishing instantly the glow of the 

 filament, should breakage of the lamp 

 bulb expose it to the air, this lamp has 

 been made both safe and rugged. The 

 outfit complete 

 weighs but three 

 and three-quarters 

 of a pound, of 

 which three and a 

 half pounds arc 

 carried on the belt 

 and four ounces 

 on the cap. The 

 battery will light 

 tue lamp twelve 

 hours per charge 

 and can be relied 

 on to furnish light 

 at least ten and 

 three-quarter hours 

 per charge at the 

 end of one year's 

 service. 



The bulb is held 

 at the focal point 



A miner's safety electric lamp has long 

 been wanted. This one seems to fill the bill 



An attachment which 

 makes it possible for 

 an automobile to pull 

 itself out of the mud 

 with the assistance of 

 a pair of stout trees 



Popular Science Monthly 



between contact springs, which maintain 

 it constantly under stress, so that, in case 

 of a blow otherwise only sufficient to 

 chip or partly break the bulb, it will be 

 completely shattered by the springs and 

 will drop clear of the contact. Sufficient 

 space is provided 

 between the re- 

 flector and glass 

 cover to keep brok- 

 en lamp parts from 

 short-circuiting the 

 spring contacts. 

 This prevents the 

 possibility of igni- 

 tion even if the 

 cap lamp is seri- 

 ously damaged 

 amid explosive 

 gases. 



By means of this 

 improved lamp, a 

 miner may work 

 amid a steady white light, and feel se- 

 cure from devastating explosions. 



Using an Automobile as a Winch 



N attachment for the rear wheel of 

 an automobile, by which the au- 

 tomobile may be made to serve as a 

 winch has recently been brought out. 

 Four hooks are attached by straps to the 

 tire. The hooks are bent at their inner 

 ends, and a coiled spring passed through 

 the loops thus formed, so that the hooks 

 point towards the 

 hub. A cable is 

 wound about the 

 loops and securely 

 fastened. 



When the motor- 

 ist finds himself 

 mired, it is a sim- 

 ple matter to pass 

 one end of the 

 rope about the 

 nearest tree or tel- 

 ephone post and 

 then to start the 

 car on the first 

 speed. The revolu- 

 tions of the wheel 

 wind up the rope, 

 and act as a very 

 powerful winch. 

 The car is soon out. 



A 



