30 BULLETIN 23, U. S. DEPAETMEXT OF AGBICTILTOTK. 
Item 5. Storage and care of samples. — Samples must be carefully handle! 
breakage oar injury. They must be kept dry so far as practicable. If wet when 
received, ot known to hare been immersed or subjected to n aged \ T:dng. 
they shall he dried for at least six hours in a temperature of 100° Fahrenheit before 
testing. 
ffiE CONSTRUCTION OT THE BATTLES. 
Item 6. The machine shall he of good mechanical construction, self-contained, and 
shall conform to the following details of materials and di m ensions, and shall consist 
of barrel, frame and driving mechanism as herein described. Accompanying these 
specifications is a complete drawing (PL X; of a rattler which will meet the require- 
ments, and to which reference should be made. 
Item 7. The barrel. — The barrel of the machine shall be made up of the heads and 
headliners, and staves and stave-liners. 
The heads may be cast in one piece with the trunnions, which shall be 2§ inches 
in diameter, and shall have a bearing 6 inches in length, or they may be set with 
heavy hubs, which shall be bored out for 2 T V-inch shafts, and shall be keyseated for 
two keys, each | inch by f inch and spaced 90 degrees apart. The shaft shall be a 
snug fit and' when keyed shall be entirely free from lost motion. The distance from 
the end of the shaft or trunnion to the inside face of the head shall be 15§ inches in the 
head for the driving end of the rattler, and llf inches long for the other head, and the 
distance from the face of the hubs to the inside face of the heads shall be 5§ inches. 
The heads shall be not less than f inch nor more than § inch thick. In outline, each 
head shall be a regular 14-sided polygon inscribed in a circle 28f inches in d i a m eter. 
Each head shall be provided with flanges not less than f inch thick and extending 
outward 2 J inches from the inside face of the head to afford a means of fastening the 
Bb " ■ r = . The surface of the flanges of the head mn sfcl e smooth and must give a true and 
uniform bearing for the staves. To secure the desired true and uniform bearing the 
surfaces of the flanges of the head must be either ground or machined. The flanges 
shall be slotted on the outer edge, so as to provide for two 1-inch bolts at each end of 
each stave, said slots to he ft inch wide and 2f inches, center to center. Each slot 
shall be provided with a recess for the bolt head, which shall act to prevent the turning 
of the same. Between each two slots there shall be a brace § inch thick, extending 
down the outward side of the head not less than 2 inches. 
There shall be for each head a cast-iron hea d l in er 1 inch in thickness and conform- 
ing to the outline of the head, but inscribed in a circle 2Sf inches in diameter. This 
headliner shall be fastened to the head by seven f-inch cap screws fchi . ugh the head 
from the outside. Whenever these headliners become worn down J inch below their 
initial surface level at any point of their surface, they must be replaced with new mm 
The metal of these headliners shall he hard mach in ery iron and should contain not less 
than 1 per cent of combined carbon. 
The staves shall be made of 6-inch medium steel structural cha n nels 27 J inches long 
and weighing 15.5 pounds per lineal foot. The staves shall have two holes ^| inch 
in diameter, drilled in each end, the center Line of the holes being 1 inch from the end 
and If inches either way from the longitudinal center line. The spa ; - - - ai the 
staves shall be as uniform as practicable, but must not exceed ^ inch. 
The interior or flat side of each stave shall be protected by a liner § inch thick by 
5§ inches wide by 19f inches long. The liner shall consist of medium steel plate and 
shall be riveted to the channel by three J-inch rivets., one of which shall be on the 
center line both ways and the other two on the longitudinal center line and spaced 
7 inches from the center each way. The rivet holes shall be countersunk on thr 
of the liner and the rivets shall be driven hot and chipped off flush with thr s .. 
of the liners. These liners shall be inspected from time to time, and if found loose 
shall be at once reriveted, but no liner shall be replaced by a new one exce": I - 
the whole set is changed. 
