160 FOREST PRODUCTS 



lassed " by power which consists of throwing a wire rope over the loose 

 ends and drawing them together until the head truss hoop can be thrown 

 over them. The power is then released and the barrel rolled or conveyed 

 to the trusser after leveling the staves by slamming the barrel on end on 

 the floor. When steamed, the barrels, after windlassing, are sometimes 

 sent to the heaters to dry them out. The function of the trusser is to 

 force the hoops well down on the barrel. The barrel next goes to the 

 crozing machine which crozes, chimes and howels the staves in one oper- 



FIG. 41. Method of heating the staves preliminary to placing them in a power windlass for 



final assembling. 



ation, finishing both ends at the same time. To accomplish this, the 

 three tools are placed in one head, which, revolving at high speed inside 

 of the package insures a uniform thickness and depth of chime. Mean- 

 while stationary cutters level the barrel. The bung hole is then bored 

 and the barrel goes to the heading-up machine, where the heading is 

 inserted by releasing the head truss hoops. Many of the tight barrels 

 are inserted in a lathe and turned at a rate of from 100 to 150 R.P.M. 

 against a smoothing plane to give them a better finish. The barrels then 

 go to the thin hooper, where the steel hoops are driven down in final 

 shape. The last operation consists of testing the permeability of the 

 vessels, after which all cracks or leaks are repaired and it is inspected 

 and stored until needed. 



