10 BULLETIN 472, U. S. DEPARTMENT OF AGRICULTURE. 
shown in figure 8. A circular metal disk, or plate, upon which the 
test kettle rests when in place, is clamped on the upper side of the 
grating in such a position that the center of the plate coincides with 
the center of the opening in the base. Two metal guide pins, about 
3 inches apart, are fastened to the edge of the plate and then ex- 
tended upward about half an inch higher than the surface of the 
Fic. 5.—Side view of the special apparatus for testing the weight per bushel, showing the 
beam swung to the right and the hopper and test kettle in place ready for filling the 
kettle. 
plate. These guide pins are placed here to center the quart test 
kettle when it is in place on the plate. The two guide pins are con- 
nected by a strip of metal of the size and shape illustrated in figures 
7 and 8. This strip of metal is free swinging, and when swung over 
on the plate forms a guide for centering the pint test kettle. 
Fitted into metal sockets sunk into the after part of the base are 
two tubular metal posts 19 inches long and connected with a casting 
