FOR PRACTICAL 

 WORKERS 



ifitfti 



Dynamo Lighting System for 

 a Motorcycle 



Winner of Third Prize in Contest 



THE modern automobile with its self- 

 contained electric plant is much envied 

 by the motorcyclist, but electric lights are 

 equally possible for the motorcycle, with 

 the dynamo in the illustration. Take a 

 rim of an old bicycle wheel and bolt it on 

 the rim of the motor- 

 cycle to make a belt 

 drive for the dynamo, 

 which is fastened on 

 the luggage-carrier 

 supports. The dy- 

 namo used on the 

 motorcycle illustrat- 

 ed was a discarded 

 one taken from the 

 ignition system of an 

 automobile. The 

 headlight used car- 

 ried an 8-volt, 12 

 candlepower bulb. 

 In running from 4 to 

 40 miles per hour a 

 good light is pro- 

 duced. When not 

 running, a switch is 

 used to turn the cur- 

 rent on from the battery. The battery 

 consists of 4 cells of dry battery placed in a 

 box that is bolted on the braces of the lug- 

 gage carrier. — David W. Freve. 



The dynamo mounted on the luggage-carrier 

 supF>orts is driven by a belt from the rear wheel 



Things to Know About Your 

 Motorcycle Clutches 



THE clutch, the intermediary between 

 engine and rear wheel, has been to 

 many motorcyclists more or less of a 

 myster>'. Indeed, some of the early 



clutches were weird and wonderful. How- 

 ever, modern motorcycles are equipped 

 with clutches which if properly used and 



cared for will give excellent service. In 

 principle, a clutch consists of a number of 

 disks contained in a circular casing. 

 Every alternate disk is secured by projec- 

 tions around the periphery which fits in 

 grooves in the casing. On the outside of 

 this casing is mounted a sprocket connected 

 with the motor sprocket by means of the 

 short drive chain. The counter- 

 shaft, by means of 

 which power is trans- 

 mitted to the rear 

 wheel, extends with- 

 in the clutch casing 

 and carries the other 

 alternate disks by 

 means of projections 

 on the central hole 

 of these disks. 

 Strong springs are 

 used to clamp the 

 disks integrally to- 

 gether when driving, 

 and a screw-opera ti- 

 ed thrust bearing is 

 used to compress the 

 springs and free the 

 diskswhen theclutch 

 is thrown out. Two 

 general types of 

 clutches are in use — the dry plate employ- 

 ing steel surfaces in contact with raybestos 

 linings, and the grease or oil lubricated 

 steel on steel clutch. 



With proper usage, the dr>' clutch should 

 not require new raybestos linings oftener 

 than once a season. When polished and 

 dry, the linings may be improved by the 

 application of glycerine. As the linings 

 wear down, the copper rivets should be 

 insp)ected carefully to see that they do not 

 project above the surface of the linings. If 

 the rivets do project too far, they will come 

 in contact with the steel plates and cause 

 the clutch to become harsh and jerky. The 



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