SHEEP SCAB. 35 



HE WOODEN VAT. 



As shown in the phms for the Avooden vat, one side of the running 

 chute is made of portable panels so they may be shifted and the 

 space converted into a legging pen. Two styles of framing are 

 shown. In the cedar-groAving sections the cedar-jjost frames are 

 preferable because tlie}^ do not decay rapidly, while the sawed white- 

 pine timbers do. Where hardwood is nsed instead of white pine the 

 frame timbers need not be so heavy ; 4 by -i inches is heavy enough 

 for framing in hardwood. The frames are set from 2| to 4 feet 

 apart, depending on the character of the soil and the material used; 

 2| feet apart is a safe rule, as the closer the frames are to each other 

 the less tendency there is for the sides of the vat to bulge in between 

 the frames. Two-inch tongued-and-grooved planks should be used 

 in making the vat, and they should be beveled so all joints and seams 

 may be properly calked with oakum or similar material. 



THE CEilENT VAT. 



In the plan for the cement plant the corrals and chute are very 

 conveniently arranged. The portable panels can be shifted to form 

 either a running chute or a legging pen. The settling and screening 

 wells shoAvn can also be constructed as a part of any vat by changing 

 the slope of the draining pens so the dip will run into the wells in- 

 stead of down the runway. In making the forms for a draining 

 well, the groove into which the removable screen is to sit should be 

 provided for, as Avell as the 4-inch opening into the vat. 



The trench for a cement vat should be excavated so the inside 

 dimensions correspond Avith the outside dimensions of the vat when 

 completed. If the sides of the trench are smooth and reasonably 

 firm, they can be used as the outer wall of the form, but in all cases 

 where the vat is extended above the surface of the ground it is 

 necessary to build forms extending from the surface of the ground 

 to the top of the vat. If the soil is sandy, it wnll be necessary to 

 build outer forms, in Avhich case the trench should be wide enough 

 to alloAv for these forms. The drain and other pipes shoAvn in the 

 draAving should be placed in the form and should all be threaded 

 and capped so proper connections may be made. Three pairs of 

 ^-inch bolts should be embedded in the concrete of the incline for 

 attaching the false floor or runway. This floor is made of 1 by 6 

 inch boards laid lengtliAvise Avith cross cleats, as shown in draAvings. 

 Tavo pairs of bolts also should be embedded for attaching the slide 

 board. Steam pipes should not be molded into the concrete Avails, 

 as the vibration of the pipes Avill crack the cement. They should 

 pass OA-er the top of the vat and doAvn the side in a grooA^e formed 



