SHOP EQUIPMENT 



477 



supposed, as nearly as possible, to keep pace with the 

 increased expense. In this connection, however, a special 

 exception may be made with reference to the lathe which is 

 the most important hiqh-priced piece of machinery that the 

 shop can possess. Tims if the funds permit the purchase 

 of a lathe at all this is perhaps best done immediately 



Detail of- valve 

 const ruction 



Worm gear wheel 

 fixed to inner 

 rotating tube 



\-Outlet tube 

 .Outer fixed tube 

 ]_ ^ Inner, rotating tube 



Washer flush 

 with standard, 

 not moveable 



-Inlet tube 



To animal 



Fig. 366. Special interrupting valve driven by a small (1/10 horse power) motor. 

 The details of the construction of the valve are shown in the upper part of the illustra- 

 tion. This valve is essentially like one devised by Cannon, Martin and Mendenhall. 

 Gates has also used a principle like this in connection with a pump and motor combined in 

 one apparatus. A valve of this form should be used close to the animal, since if the air 

 is piped a long distance the slow turning on and off of the air permits compression in the 

 tubes and a prolonged, wave-like blowing at the outlet faucets. 



after the first thirty items in the list have been provided 

 for. On the other hand if a lathe cannot be bought then the 

 items may very well be bought in approximately the order 

 in which they appear in the list. It is to be noted, of course, 

 that each mechanic will have manv small items to add to 



