462 



three positions, one being "off," one 

 for battery and the other for the mag- 

 neto or second set of batteries. If but 

 one set of batteries was used, or if the 

 magneto was used without batteries, 

 it will be necessary only to use a 

 switch having two terminals, one "on" 

 and one "off." The switch selected 

 should be fastened to the dash or to 

 the box containing the master coil, 

 previously described. 



The system is then ready for wiring. 

 A good grade of primary wire should 

 be used, and the connections should 

 be made with regular brass or cop- 

 per wire terminals soldered on. The 

 switch originally used on the coil case 

 should be placed in one of the positions 

 formerly used for running and al- 

 lowed to remain there permanently. 



Popular Science Monthly 



^romognefo 



Wiring diagram showing connections for 

 master vibrator 



If the position selected is on the "mag- 

 neto" side, the following connection 

 will be made to the terminal which 

 formerly ran to the magneto ; if on the 

 "battery" side, to the connection which 

 ran to the battery. This terminal, either 

 battery or magneto, should now be con- 

 nected to either terminal on the master 

 coil. 



If a switch having but two terminals 

 was used, the remaining connection 

 from the master coil should be con- 

 nected to either switch terminal. If 

 a switch having three terminals was 

 used, this connection from the master 



coil will be made to the common ter- 

 minal on the switch. This common 

 terminal is the one that completes a 

 circuit through either of the other 

 switch terminals, depending on which 

 way the switch is thrown. 



If the switch having but two termin- 

 als is in use, connect the unused ter- 

 minal to the battery or magneto 

 through the wire which formerly ran 

 to the coil on the car. If the three- 

 terminal switch is used, run a wire 

 from the terminal that completes a 

 circuit when in the "battery" position 

 to the battery, and run another wire 

 from the terminal that completes the 

 circuit when in the "magneto" posi- 

 tion to the magneto. This can be ac- 

 complished by attaching the wires that 

 formerly ran to the car-coil terminals 

 to the new switch terminals. 



Provided the connections have been 

 made as directed and other wires have 

 not been disturbed, the system is ready 

 to operate when the master vibrator 

 has been properly adjusted. This is 

 done by turning the adjusting screw 

 until the contacts are seen to sepa- 

 rate. The screw is then turned in the 

 opposite direction until the contacts 

 just come together. Turn the starting 

 crank or flywheel with the new switch 

 in the "battery" position until the vi- 

 brator is heard to buzz; then turn 

 the switch of¥ without moving the fly- 

 wheel out of this position. The vi- 

 brator may be adjusted by removing 

 a spark plug wire about Vx'' from the 

 plug and again turning on the switch. 

 Turn the adjusting screw one way or 

 the other until a good strong spark is 

 secured, replace the spark plug wire 

 and start the engine as usual. 



Cutting Brass 



WITH a quill pin dipped in a strong 

 solution of alcoholic corrosive 

 sublimate, draw a line on the brass. Set 

 it dry and then go over it with the pen 

 dipped in nitric acid. The metal may 

 then be broken like glass cut with a 

 diamond. — John Schmelzeis. 



If you want further information about the subjects which are taken up in 

 the Popular Science Monthly, write to our Readers' Service Department. We 

 will gladly furnish free of charge names of manufacturers of devices described 

 and illustrated. 



