Popular Science Monthly 



551 



CIvjkh 

 inside 



Slotted' 



plate / joint 

 Drive -shaft 



5. The labor-saving device submitted 

 must be clearly shown in one or more 

 views. The drawings need not be made 

 by a skilled draftsman. It is sufficient 

 that they should be intelligible. While 

 pencil sketches will be considered, con- 

 testants are requested to make their 

 drawings in ink on bristol board. The 

 views should be sufficient in number 

 to set forth the construction and general 

 arrangement of the parts clearly. The 

 contestant's name and address should ap- 

 pear on each sheet of drawings. 



6. Thedraw^- 

 ings must be 

 accompanied 

 by a descrip- 

 tion, preferably 

 typewritten, in 

 which the con- 

 struction and 

 operation of the 

 device is clearly 

 given. It must 

 be written on 

 one side of the 

 paper only, and 

 it should not be 

 more than five 

 hundred words 

 in length. The 

 name and ad- 

 dress of the con- 

 testant should 

 appear in the 

 upper left-hand 

 corner of the 



first sheet of the written description. 



7. The drawings and description en- 

 tered by contestants must be received by 

 the Popular Science Monthly not later 

 than 5 P. M. on April 10th. 



8. The judges of the contest will be 

 the editors of the Popular Science 

 Monthly. 



9. The following de\dces and processes 

 are barred from the contest: 



All compounds to be mixed with the 

 fuel in an attempt to obtain more power. 



All auxiliary air devices and similar 

 equipment designed to save fuel by mak- 

 ing the mixture leaner. 



All parts of the engine, clutch, gear set, 

 transmission mechanism, rear axle, steer- 

 ing wheel and any other part of the 

 chassis, unless a reduction in the amount 

 of muscular energy at present expended 



Tooth control ling 

 Chanqe -speed "^ovenr^eritot 

 qear change -speed 



gear 



This illustration also shows a clearly detailed 

 drawing of a device that enables a driver to 

 change speeds without expending energy to throw 

 the clutch in and out. It consists of three gears 

 arranged on the surface of a cone and parallel to 

 the base. Spiral gears connect the three main 

 gears and allow one gear, driven from the main 

 shaft to be slid from the smaller of the gears on 

 the frame to another and back again without 

 throwing out the clutch as is usually necessary 



to drive the average automobile is ob- 

 tained. 



10. A first prize of $100 will be awarded 

 to the contestant who, in the opinion of 

 the judges, has produced the simplest, and 

 most desirable labor-saving device. 



A second prize of $50 will be paid to the 

 contestant who submits the device next 

 in order of merit. 



11. The wiimers of the contest will be 

 announced in the June issue of the Popu- 

 lar Science Monthly. A description 

 of the device which won the first prize will 



appear in the 

 same number, 

 together with 

 the name of the 

 winner. In the 

 July issue of the 

 Popular Sci- 

 ence Monthly 

 a description of 

 the device which 

 wins the second 

 prize will be 

 published to- 

 gether with the 

 name of the 

 wunner. 



12. The ed- 

 itors of the Pop- 

 ular Science 

 Monthly shall 

 have the right 

 to publish meri- 

 torious devices 

 which do not 

 win a prize. The regular space rates will 

 be paid to the contestants who submitted 

 the drawings and descriptions of devices 

 thus selected. 



13. Each contestant retains full property 

 rights in the invention that he submits. 

 The only restriction is that imposed by 

 Rule 12. 



14. When a contestant submits more 

 than one device the description and draw- 

 ing of each device must be sent as a 

 separate unit. 



15. No manuscripts or drawings will be 

 returned to contestant unless return post- 

 age is enclosed on submission. 



16. Address your drawings and specifi- 

 cations to the Motor Contest Editor, 

 Popular Science Monthly, 225 West 

 39th Street, New York. 



Please follow the above rules carefully. 



