Tubes of Guns Are Machined by Lathes 



In the near foreground of the picture above can be seen the barrel of a big gun that is 

 being bored or cut out hollow on its inside by a big lathe. Some of these lathes are very long, 

 in the section of the picture on page 42 one of the guns in a crude shape is beina carried by a 

 big electric traveling crane to a large lathe where the first paring or cutting is to be done 



43 



