Trap. -The trap is 8 feet long, 30 inches wide, with 4x6 inch sills, which should 

 be dressed to about 3| x 5| inch and 2x6 inch cross ties, planked on top with 

 smooth, hard /umber. This vat is 48 inches wide at the top, 18 inches wide at the 

 bottom, and shaped as shown in the diagram. The tank will contain 5 to 5 feet 

 of dip liquid when in use, and should be fitted with splash boards made of 2 x 12 

 inch plank. For economy in filling, this tank can also be made narrower at top, 

 except at trap end. Construct the trap 30 inches wide, 8 feet long. Trap should 



FIG. 13. Showing front view of spring trap and vertical section of swimming tank. 



swing on a l|-mch steel bar or a l-mch gas pipe by holes bored through sills, 3 

 inches from their ends, as shown in figure 10. To prevent these holes from break- 

 ing out, a 2 x 6 inch crosspiece may be used, with strap irons i x 1| inch spiked 

 over both ends, as a means of strengthening. Two staples may also be used to pass 

 around the 1^-inch pipe or steel bar to take part of the strain and prevent the pipe 

 or bar from bending. 



159 



