16 BULLETIN 347, U. S. DEPARTMENT OF AGEICULTUBE. 
EQUIPMENT. 
Small jaw crusher. 
Balance (same as used in abrasion test). 
100 c. c. graduate. 
Several 1-pint jars, with metal screw caps. 
Ball mill. 
The ball mill shown in figure S consists essentially of the cast-iron 
casing (AB), split into the two unequal segments (A and B). It 
revolves in a vertical plane on the shaft ((7(7) bearing in the pillow 
blocks (DD) and driven by the pulley (E). The steel shot used for 
grinding measure 5 inches in diameter and weigh 20 pounds each. 
Two shot are used in each mill. 
Briquette-forming machine. 
This machine is shown in figure 9 and consists fundamentally of a 
hydraulic cylinder (A) supporting an iron platform (B) through the 
piston rod ((7). The cylindrical metal die (D) is provided with a 
closely fitting plug (E) supported by guide rods (KK). The supply 
pipe shown in the cut admits water to the cylinder. The lever arm 
(G) is provided with an adjustable weight (H) consisting of a hollow 
cylinder partially filled with shot. Details of the metal die are 
shown in figure 10, in which a small metal stand (A') shaped in the 
form of a half circle is used in removing the compressed material. 
Small balance weighing to 100 grams and sensitive to 0.1 gram. 
Millimeter scale. 
Drying oven. 
The oven should be equipped with a thermometer and regulating 
device for maintaining a constant temperature of 100° C. for several 
hours. 
Desiccator and calcium chloride. 
Shellac dissolved in alcohol. 
Page impact machine for testing cementing value. 
The machine as shown in figure 11 consists essentially of the 
motor (A) driving the cam shaft (E) by means of a worm gear at the 
rate of 60 revolutions per minute. The plunger (H), weighing 
one-half kilogram, is held in position on the briquette (7) by means 
of two spiral springs, one on each side of the sleeve in which the 
plunger slides. The lever (L) is pivoted on the plunger through a 
slot cut in the sleeve. It carries a brass pencil at one end, while the 
other is provided with means for adjusting the height of the pencil 
with reference to the drum (M). The hammer (G), weighing 1 kilo- 
gram, is raised by the pin (F) which slides upon the face of the cam 
(E). The pin is provided with a thumbscrew and locknut (F) for 
adjusting and maintaining its vertical position. The cam (E) is also 
provided with means for imparting at each revolution a slight motion 
to the drum (M), so that the drum makes one complete revolution for 
each 100 blows of the hammer. 
