fi8<S 



VnpiiUir Science Montlih/ 



Recording 



The paint is first vaporized and then forced thniu^li h-^^ 

 and sprayed on the cars by means of compressed an 



the Vibrations of a Motor- 

 Truck Spring 

 THE novel device illustra- 

 te<l was recently designed 

 to enable a truck manufactur- 

 ing company U) judge what 

 springs are best adapted for 

 its vehicles. 



The device consists of a 

 hollow drum mounttxl on a 

 ^■ertical axis and carried 

 in an oix-n-siiied box 

 attached to the truck 

 body at the rear of the 

 driver's cab. It is re- 

 volved by gearing from 

 the front wheels of the 

 truck through a flexible 

 cable. A blank strip of 

 paper is fed around the 

 outer circumference of 



I 



The Hose Is Mightier and Quicker 



Than the Brush 

 F KIPLING had only waited long 



enough before saying it our picture 

 might have given him his idea abcut 

 painting with a comet's tail for a brush 

 and the sky for a canvas. However, the 

 painters shown in the accompanying 

 illustration are not artists and their 

 canvas is not the sky but two brand-new 

 steel box-cars which ha\e just 

 emerged from the shop 



This is the fastest and 

 most economical 

 method of painti 

 yet devised. Th 

 paint is first vn- 

 ])orized and then 

 forced throutili 

 the hose and 

 sprayed on the 

 cars by com- 

 pressed air. 



While the ' 

 photographer 

 was adjusting 

 his camera for 

 a snapshot the 

 ends of both 

 these cars were 

 painted, which 

 gives an idea 

 of how rapidly 

 t h e work is 

 ac<(inii)li-'hcd. 



\ H9 1 iPfJMG UXVDE D 



N92 SPRING lOAOeO 



Inscription of a record on the 

 strip of paper around the drum 



The device is carried in an open-sided frame attached 

 to the body of the truck at the back of the driver's cab 



the drum from 

 a roll beside it. 

 While the 

 truck is run- 

 ning the spring 

 \i brat ion is 

 proportional to 

 ilu' motion be- 

 t w c e n t h e 

 body, to which 

 the device is 

 fixed, and the 

 axle. This 

 record is in- 

 scribed on the 

 sheet around 

 the drum by 

 m e a n s of a 

 pencil carried 

 on a .swivel by 

 a spring-arm. 



