76 MODERN SCIENCE READER 



that the metal is not burned on the sides of the cut are 

 plainly seen. 



The closeness with which the metal can be cut to a line 

 is best illustrated by the small slab in the upper right 

 hand corner. In the center of the slab it will be noticed 

 that there has been left a thin strip of metal. This is but 

 one eighth of an inch thick, while the cut is one and one- 

 fourth inches deep, and is practically no wider at the 

 bottom than at the top. 



Another appliance can be used in an ordinary brace for 

 cutting circles from two to twelve inches in diameter, and 

 yet another can be attached to a beam located in a trammel 

 point for cutting larger circles. The torch is fastened by 

 thumb screws to two U-shaped rods that are mounted on 

 wheels. Either of these rods, or both together, can be 

 raised or lowered so as to accommodate the torch to any 

 inequalities in the surface of the metal, or to locate it the 

 proper height above the metal for successful cutting. 



One of the most useful applications of this process is in 

 the cutting of steel tubes or pipe. A special attachment 

 has been made for this purpose. It is made in several 

 sizes to accommodate the different sizes of pipe. 



The pipe is inserted in the center of a ring and is 

 clamped there by three set screws. The torch is then 

 revolved around the pipe and cuts it with a good clean cut 

 and hardly any waste of metal. A small wheel, that runs 

 around the pipe back of the nozzles, locates their position, 

 and adjustment can be obtained by means of a spring in- 

 side of the apparatus. This apparatus is especially valu- 

 able in plants where power is not available. 



Another style of pipe cutting machine is built, which 

 can be used on pipe that has flanges on both ends, and it 

 is made so it can be adjusted to fit different diameters of 

 pipe. This machine can be used for cutting the openings 

 for branch connections Branch flanges can also be cut out. 



A manhole cutting machine is also made which will cut 

 oval, round, and square holes up to eight inches square. 



