sro 



Popular Science Monthly 



Below: Plan of 

 Interdependent 

 Sprockets and 

 Chains. One Sproc- 

 ket of Each Scries 

 Is Connected by a 

 Shaft to the Cor- 

 responding Sproc- 

 ket of the Other 



A Roller on Each 

 Clamp Runs on a 

 Track Placed Be- 

 neath the Chain 

 and into a Cam 

 Which Lowers It 



In "The Auto Maze" There Are Two Sets of Automobiles Speeding in Opposite Directions 

 on Two Intersecting Triangular Courses. The Cars are Operated by Two Chains Under the 

 Floor and Driven by Twenty-Foot Sprockets. A Collision Seems Almost Inevitable 



faithfully a town which actually under- 

 went several nocturnal raids. The 

 representation is so good that many, 

 familiar with the. town, would im- 

 mediately recognize it. 



The aiKeiit of tiie airships, which 

 drop murderous bombs on tiie inolTensi\'e 

 little town, makes the spectators feel 

 that they are really present at the raid. 



The other form of thriller, di'signed 

 for ])urely ])hysical thrills, is well 

 re|)resentcd by the next figures. 



Have you ever been in an automobile 

 smash-up? If you have, you know what 



it feels like, but if not you can get all the 

 excitement with none of the actual 

 danger. In this Icitest "thriller" the 

 impression gi\'en is that a serious smash- 

 up is inexitable. The s|)eeding cars 

 ai)proach each other at right angles, and, 

 just as a collision is about to take place, 

 the cars glide gently by with several 

 inches to spare. The safety of the 

 device is assurc-d by the very complete 

 yet simple njechanism |)ictured. Sim- 

 plicity is really the keynote of a device 

 of this nature; complication means 

 unrcliabilit)' and possible danger. 



