134 



TRANSACTIONS OF THE 



in proportion to their thickness. The transverse curvature of the 

 stave is given by the concavity of the upper and the convexity of 

 the lower series of rollers, and can be varied to any required 

 extent by changing the rollers for those of greater or less con- 

 vexity or concavity. The longitudinal curviture of the staves 

 may be increased or diminished by operating on set screws before 

 mentioned. 



A and B are the staves passing in through the rollers, from 

 which they receive their shape, as shown by a stave leaving the 

 machine at C ; the stave is shown more plainly at D, Figure 2. 

 The belts, D D, Figure 1, drive the machine, and require about 

 two-horse power. 



Fig. 2. The Jointer. 



A is the outside clamp, B the inside clamp, C the handle, by 

 which the clamp B brings the stave D in the position it holds in 

 the barrel, cask, or hogshead, when set up. The connected parts, 

 A and B, holding the stave D, then are made to pass by the saws, 

 E E, by which the staves are cut the right length, and also cham- 

 fered, crozed, and howelled. The clamp is then pressed towards 

 the jointer F, which brings the stave in contact with the knives 

 finishing that side of the stave. It is then passed back to the 

 other side of the jointer G, which finishes the other side; and then 

 by raising the handle, C, the stave is released, and passes through 

 an opening in the floor. 





Fig. 3. The Head Cutter. 



