Dept. Bull. 1500, U. S. Dept. of Agriculture 
Plate 7 
Screw-Type Presses 
A.— Large hand-screw press at the Forest Products Laboratory. The instruments under the 
jackscrews are used to measure the loads. This special equipment was used to study the effect 
of pressure on the strength of joints in thick stock. 
B.— A revolving clamp carrier used in gluing edge joints. The pieces are coated with glue on the 
edges by a roll-type spreader. 
