Do It with Tools and 

 Machines— a Baker's 

 Dozen of Efficiency 

 Devices for the Mecha- 

 nic and Factory Man 



An especially constructed frame 

 for holding canvas which pro- 

 tects persons from flying bits 

 of pavement blocks or other stone 



.iV9 '<% KM •.'■■.»* 



This counter attach- 

 ed to a machine ac- 

 curately records the 

 parts turned out 



In the upper circle, an ar- 

 rangement which enables a 

 one-armed man to pick up 

 nails with a magnetic hammer 



Below, a clamp to hold 

 a diamond cutter for 

 truing emery wheels 



This model maker's lathe 

 which is driven by motor, 

 is fitted with necessary 

 attachments for making 

 fine phonograph needles 



Device for forcing 

 a steel ball into 

 metal to test the 

 hardness of steel 



A chain drag used by an industrial 

 school for rimning shucks and ensi- 

 lage into a silo. It is run by a belt 

 from a motor or a gasoline engine 



At the left, n trnilcr factory truck in 

 which the front wheel attached to 

 a handle, disconnects and can be 

 used on any number of trailers 



