Placed in the Hands of the Mechanical Workers 



Above: A soldering 

 apparatus in which the 

 current employed 

 passes through the sol- 

 der being used. The 

 circuit is broken when 

 the solder is removed 

 so that none is wasted 



Below: Flexible sheet- 

 metal belting made up 

 of a series of sheets 

 linked together. They 

 are easily detached 



At left: A machine- 

 tool which cuts dupli- 

 cate keys from originals 

 in a minute or less. 

 The key to be duplicat- 

 ed is placed in the lower 

 vise and the blank 

 key in the upper vise 



Below: A tool which 

 can be adjusted to cut 

 round holes of various 

 sizes. It is operated 

 by a ratchet-wrench 



A six-pronged rack 

 which enables a man 

 to elevate a barrel in 

 three different po- 

 sitions for drawing the 

 contents. It is also 

 used in loading and 

 unloading freight 



381 



