326 



THE WORLD'S ADVANCE 



a bolt and nut for adjustments. It is 

 held in place before the front wheel of 

 the bicycle by two pairs of rods, one 

 pair being fastened to the stem of the 

 handlebars, the other to the ends of the 

 front axle. 



NOVEL BURGLAR ALARM DEVICE 

 AND HAND LANTERN 



The combination of a hand lantern, 

 call bell, photographic ruby lamp and 

 burglar alarm in a single device and all 

 so arranged that in no case is efficiency 

 sacrificed, affords an interesting example 

 of inventive genius. In the illustration 

 may be seen the outfit which combines 

 these many features in a perfectly prac- 

 ticable manner. 



On the top of the wooden container is 

 a pivoted arm carrying at one extremity 

 an electric lamp in a reflector and at 

 the other end a leather strap which is 

 slipped over the door knob when the 



device is to be used as a 

 burglar alarm. The piv- 

 oted arm makes contact 

 with a metal button 

 when the outfit is sus- 

 pended from the strap, and this contact 

 serves to light the lamp and ring the bell. 

 The reader will note that when the device 



is set the outfit is suspended from a bent 

 rod of metal which is tipped with rub- 

 ber in order that it may rest on the door 

 knob. The slightest turn of the knob, 

 should any one try the door, would serve 

 to let the rod slip from the knob, thus 

 'throwing the weight of the outfit on the 

 strap which, of course, closes the circuit. 

 The lamp may be used independently of 

 the bell if so desired and the reflector 

 is arranged on a swivel, so that the light 

 may be directed up or down as desired, 

 without moving the entire equipment. 



In replacing an exhausted battery, 

 there are no wires to connect. A spring 

 contact within the box makes connection 

 the moment the cover of the case is 

 closed. 



PULVERIZED COAL 



With the commercial advent of pul- 

 verized coal, many engineers, who made 

 preliminary tests with the substance, 

 drew conclusions that it 

 would never become an 

 important factor in power 

 development. At thai 

 time the remarkable abili- 

 ty of the internal com- 

 bustion engine became 

 known, and coal - power 

 engines, as a whole, were 

 given but a short period 

 of life. Investigations 

 have proved, however, 

 that coal as a power fac- 

 tor will live for many 

 years to come, at least 

 in this country, as the 

 United States contains 

 more than half the avail- 

 able coal deposits in the 

 world. 



Pulverized coal has one 

 decided advantage : It 

 burns almost smokeless. 

 Injecting the pulverized 

 material into the furnace 

 is accomplished by much 

 simpler means, also, than 

 with lump coal. Boiler 

 repairs are less frequent in factories 

 using pulverized coal than those where 

 lump coal is employed. 



The Slightest Turn 

 of the Door Knob is 

 Sufficient to Ring 

 the Bell of This 

 Combination Hand 

 Lantern, Call Bell, 

 and Burglar Alarm. 



