278 



Popular Science Monthly 



Switch 



so that in the event of engine failure at 

 night, the riding lights may be connected 

 directly with the storage battery. 



There are three methods by which the 

 magneto may be connected with the 

 engine. They are as shown at K, L 

 and M of the sketch showing the com- 

 mon methods of connecting the magneto 

 to the flywheel of the engine. The one 

 shown at K is termed a "friction drive," 

 wherein a beveled leather-faced pulley is 

 held tight to the 

 flywheel by 

 means of a spring 

 or governor. A 

 belt drive is 

 shown at L. The 

 belt is merely 

 passed around 

 the magneto pul- 

 ley and the fly- 

 wheel. Sketch M 

 shows a gear- 

 driven type. 

 This latter type 

 is undoubtedly 

 the most practi- 

 cal for use in an 

 open boat or 

 where the bilge 



lowing instructions are closely followed. 

 To start the motor, open the valves in 

 the gasoline line, and the needle valve on 

 the carburetor. One turn with the thumb 

 nut is sufficient with most carburetors. 

 Next, close all the switches and flood the 

 carburetor by pressing down the priming 

 cap until a few drops leak out of the bottom 

 of the carburetor. Now open the throttle 

 about one-half or three-quarters and set 

 the timer at commutator so that the engine 

 « .. , will not back-fire. 



Quad, coils 



Magneto 

 Ground to engi 



Four-cylinder jump 

 spark using 

 single coils 



Magneto_ 

 Ground to engine frame • 



Four-cylinder jump spark 

 using quad, coil 

 Battery 

 Coil 



Four-cylinder "make and 

 break 



Three wiring diagrams for a four-cylinder marine en- 

 gine, one for the jump spark, with single and quad- 

 ruple coils and the make and break type connections 



About three or 

 four notches from 

 the end of the 

 quadrant is a safe 

 position. Then 

 grasp the handle 

 with the fingers 

 and take hold in 

 such a way that 

 if the motor 

 should back-fire 

 the end will slip 

 off the handle; 

 but never close 

 the thumb 

 around the han- 

 dle, as a broken 

 arm or shoulder 



water may be splashed on the flywheel; 

 for either type K or L will slip more or 

 less if the flywheel gets wet. All of these 

 magnetos are equipped with a governor 

 to prevent them from being driven too 

 rapidly when the flywheel is revolving at 

 excessive speed. High tension magnetos 

 are always geared to the engine. 



Practically all gasoline motors, especially 

 marine engines, can be readily started 

 whether or not the operator is familiar 

 with his special type of engine, if the fol- 



may result. Rock the balance-wheel back 

 and forth and give it a quick pull over 

 center the way you wish the motor to go. 

 The rocking operation draws the gasoline 

 charge into the cylinder and if the proper 

 charge is taken in, the motor will start. 

 It is also good practice to prime the motor 

 through the priming cock before attempting 

 to start it, and a little oil mixed with the 

 gasoline used for priming will be of great 

 assistance. 



After the motor is under way, advance 



THREE -TERMINAL COIL 



FOUR-TERMINAL COIL 



FIVE^TERMINAL COIL 



SEPARATE COILS 



Wiring diagrams for connecting up a single cylinder as well as a double cylinder marine engine 

 with ba tte ries, spark coil and timer, also magneto and timer using single and double coils 



