The Simms=Bosch High=Tension Magneto.

Progress, Volume III, Issue I, 1 November 1907, Page 28

The Simms=Bosch High=Tension Magneto.

[By W. H. Trkngrovj-.]

The Simms-Bosch high-tension magneto is so rapidly growing in popular tavour that the following description and rotes on the care of the invention will be read -with interest. The apparatus combines the functions of an induction coil with those of a low -tension magneto and contact breaker. One end of the primary wire is earthed while the other end is m connection with the secondary A\ire and also with the insulated side of the contact breaker. The other side of the contact breaker being earthed The primary currert is complete only while the platinum points are in contact The condenser is connected across the contact breakei asm the ordinary accumulator method of ignition. This system prevents destructive sparking across the platinum points when they are parted by the action of the bell-crank lever that revolves inside the recessed fibre ring. The secondary wire is connected to ore end of the primary and then to earth. The other end, which i' is necessary to have extremely well insulated from the body of the machine, is connected to the sparking plug, which should be one of the best quality plugs specially made for the magneto ignition When the platinum

magneto and worry to the owner. The armature shaft must certainly be well lubricated with thick oil of high quality. It is of the utmost importance that after e\ery two or three weeks running the oil reservoirs should be washed out with kerosene and then filled up cgam with oil until it runs cut of the overflow pipes. By strict attention te this matter one will be rewarded with better results from the magneto.

Setting the Magneto. Ihe correct setting of the magneto m relation to the engine is a simple matter. As soon as the piston has reached the top of the compression stroke the tuning lever with gunmetal strap and fibre ring should be taken off A line -will always be fotmc cut on the edge of the contact-breaker disc, and a similar line on the right side of the front bearing the two lines must be set to coincide exactly, then the connection between magneto and motor, either by chain or gear wheels, can be connected up. The Smims- Bosch magneto can be easily adapted to work in the opposite direction of rotation by fitting another fibre ring with the recess differently placed. The life of the fibre ring, from writer's experience, is about 3,000 miles.

points are mechanically separated the primary current stops flowing The lints of force fall m upon the armature core, cut the secondary coil producing a current of high voltage, and at once a spark is produced at the plug 'I he distance between the points of the sparking plug should be as near as possible one fiftieth part oi an inch to obtain the best results

Locating Faults. If theie is a failure of the ignition system the sparking plug should be first suspected as the most likely cause, provided that the contact breaking mechanism has been kept thoroughly clean from dust and oil V key spanner or piece of wire will help to find a fault It should be placed on the secondary terminus when the secondary wire has been removed, and the end placed close up to the field magnets so as to leave a gap of about one-twenty-flfth of an inch It then the armature is quickly revolved a spark should flash across the gap at regular intervals If the spark is uneven 01 does not pass at all, the fault is m the magneto and is probably caused through a bad contact dae to oil or dirt The point on the Hat spring that presses on the centie of the brass cover and the carbon brush on the screw should be yen, thoroughly cleaned Other causes of stoppage art the failure of the bell-crank lever to make and break contact, or misfiring, through the hbre ring being woin out which should be replaced with a new fibre ring

Lubrication. 'I his is one of the very senous items that is far too often overlooked or neglected, causing rum to the