38 
BULLKTIX 1210, T T . S. DEPARTMENT OF AGRICULTURE. 
Brick charge 
Speed and 
duration of 
revolution. 
Record for 
For each now batch of spheres used the chemical analysis shall 
be furnished by the maker or shall be obtained by the user before 
Introducing into the charge, and unless the analysis meets the 
above specifications the batch of spheres shall be rejected. 
THE OPERATION OF THE TEST. 
5. The brick charge. — The number of brick per tost shall be 10 
for all brick of so-called "block size," whose dimensions fall be- 
tween S and 9 Inches in length, .'* and :V] inches in breadth, and 
3| and -11 inches in thickness. 12 No brick should be selected as 
part of a regular test that would be rejected by any other require- 
ments of the specifications under which the purchase is made. 
('.. Speed and duration of revolution. — The rattler shall be ro- 
tated at a uniform rate of not less than 29. 5 nor more than 30.5 
revolutions per minute, and 1,800 revolutions shall constitute the 
test. A counting machine shall be attached to the rattler for 
counting the revolutions. A margin not to exceed 10 revolutions 
will he allowed for stopping. Only one start and stop per test is 
jrenerally acceptable. If, from accidental causes, the rattler is 
stopped and started more than once during a test, and the loss 
exceeds the maximum permissible under the specifications, the 
test shall be disqualified and another made. 
7. The scales. — The scales must have a capacity of not less than 
300 pounds, and must be sensitive to 0.5 ounce, and must be 
tested by a standard test weight at intervals of not less than every 
10 tests. 
8. The results. — The loss shall be calculated in percentage of 
the initial weight of the brick composing the charge. In weigh- 
ing the rattled brick, any piece weighing less than 1 pound shall 
be rejected. 
9. The records. — A complete and continuous record shall be kept 
of the operation of all rattlers working under these specifications. 
This record shall contain the following data concerning each test 
made : 
til The name of the person, firm, or corporation furnishing 
each sample tested. 
(2) The name of the maker of the brick represented in each 
sample tested. 
(3) The name of the street, or contract, which the sample rep- 
resented. 
(4) The brands or marks upon the brick by which they were 
identified. 
(5) The number of brick furnished. 
(6) The date on which they were received for test. 
(7) The date on which they were tested. 
(8) The drying treatment given before testing, if any. 
(9) The length, breadth, and thickness of the brick. 
(KM The collective weight of the ten large spherical shot used 
in making the test at the time of their last standardization. 
(11) The number and collective weight of the small spherical 
shot used in making the test, at the time of their last standardiza- 
tion. 
(VI) The total weight of the shot charge, after its last stand- 
ardization. 
(I.".) Certificate of the operator that he examined the condi- 
tion of the machine as to staves, liners, and any other parts affect- 
ing the barrel, and found them right at the beginning of the test. 
(14i Certificate of the operator f the number of charges 
tested since flic last standardization of shot Charge and last re- 
newals of stave liners. 
(l:*i) The time of the beginning and ending of each test, and the 
number of revolutions made by the barrel during the test, as 
shown by the indicator. 
«* Where t»ri*-k of larger or smaller sizes than the dimensions riven 
above for Mock are to !»<• tested, the Bame number of brick per charge 
Bhould be used, but allowance for the difference in size should be made 
in setting the limits for average and maximum rattler loss. 
