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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
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