314 



Popular Science Monthly 



An Electric Gas. Lighter for the 

 Kitchen Range 



THE illustration shows the necessary 

 parts and a wiring diagram for 

 making an electric lighter for the gas 

 range. A >^-in. spark coil A is con- 



Spark coil and its connection for 

 lighting the gas by electricity 



nected in line with the battery B and to 

 an old telephone hook C, for the primary 

 coil; the secondary is connected to a 

 piece of fiber tube D, which is 3<C in. 

 inside diameter with a piece of /^-in. 

 brass or iron rod driven into it, allowing 

 one end to extend M in. A heavy 

 insulated flexible wire is soldered to the 

 other end and the space filled with 

 paraffin or other insulating material. If 

 this wire is properly fastened to the end 

 of the tube, the handle piece thus formed 

 can be suspended from the telephone 

 hook when not in use. 



The other end of the secondary wire E 

 is fastened or grounded to any metal 

 part of the stove and a >^-in. gap is 

 made at F on the coil. When the fiber 

 tube is taken from the hook it will close 

 the primary circuit and a spark will 

 jump the gap F, but when the end of the 

 rod is placed near the burner on the 

 stove a spark will issue therefrom and 

 the gas will be lighted. The whole outfit 

 can be inclosed in a neat box with the 

 telephone hook extending, the box being 

 placed on the wall near the stove. 



A Reliable Radiation and 

 Tuning Indicator 



THIS arrangement acts as a radiation 

 indicator and serves the same pur- 

 pose as the hot wire meter, except that 

 it is less delicate. It does not interfere 

 with the oscillations, and can be left 

 in circuit continuously. The connections 

 are shown in the drawing. The coil is 

 constructed like a helix, and contains 

 about a dozen turns of No. 8 wire wound 

 on a form 3 in. in diameter and spaced 

 3^ in. apart. A movable contact is pro- 

 vided as shown. The lamp used is a 



small four or six-volt carbon filament 

 bulb, which may be obtained from any 

 supply house. When the transmitter is in 

 operation the lamp lights up. The coil 

 is connected in shunt around six or more 

 feet of the ground wire from the trans- 

 mitter. The proper length must be de- 

 termined by experiment. Only a small 

 part of the high frequency current is 

 passed through the coil by this arrange- 

 ment. 



To find the adjustment for maximum 

 radiation at a desired wavelength, place 

 the slides of the in- 

 dicator coil so that 

 all the turns are in 

 circuit and adjust 

 the antenna circuit 

 inductance until the 

 lamp lights up the 

 highest. Now de- 

 crease the number of 

 turns on the indi- 

 cator coil, thus de- 

 creasing the bril- 

 liancy of the lamp, 

 and re-adjust the 



transmitter circuits for the brightest 

 light. Continue this process until the 

 lamp lights up brilliantly with the least 

 possible number of turns on the indi- 

 cator coil. The transmitting station will 

 then have a maximum radiation for the 

 given wavelength. 



This will be welcomed by those wire- 

 less amateurs who could not make, or 

 who had not the means to purchase a 

 hot-wire meter. 



Substitute 

 for a hot 

 wire meter 



An Electric Gas Lighter Operated 

 with a Push-Button 



HAVING one of the single pull chain 

 electric gas lighters I decided to 

 change it into one that would work with 



^j^^CONTACTS 

 ~"^-" ELECTRO MAGNET 



An electro-magnet to operate the con- 

 tact points for making spark on gas tip 



a push-button, and I accomplish my pur- 

 pose by making the simple arrangement 

 illustrated. The single chain type, as is 



