36 BULLETIN 246, U. S. DEPARTMENT OF AGRICULTURE. 
17. The initial collective weight of the 10 brick composing the charge and 
their collective weight after rattling. 
18. The loss calculated in per cents of the initial weight : and the calculation 
itself. 
19. The number of broken brick and remarks upon the portions which were 
included in the final weighing. 
20. General remarks upon the test and any irregularities occurring in its 
execution. 
21. The date upon which the test was made. 
22. The location of the rattler and name of the owner. 
23. The certificate of the operator that the test was made under the specifica- 
tions of the American Society for Testing Materials and that the record is a 
true record. 
24. The signature of the operator or person responsible for the test. 
25. The serial number of the test. 
In event of more than one copy of the record of any test being required, they 
may be furnished on separate sheets and marked duplicates, but the original 
record shall always be preserved intact and complete. 
ACCEPTANCE AND BEJECTIOX OF MATERIAL. 
Item 15. Ba&is of acceptance or rejection. — Paving brick shall not be judged 
for acceptance or rejection by the results of individual tests, but by the average 
of not less than five tests. Where a lot of brick fails to meet the required 
average it "shall be optional with the buyer whether the brick shall be definitely 
rejected or whether they may be regraded and a portion selected for further 
test as provided in Item 16. 
Item 16. Range of fluctuation. — Some fluctuation in the results of the rattler 
test, both on account of variation in the brick and in the machine used in 
testing, are unavoidable, and a reasonable allowance for such fluctuations 
should be made wherever the standard may be fixed. 
In any lot of paving brick, if the loss on a test computed upon its initial 
weight exceeds the standard loss by more than 2 per cent, then the portion 
of the lot represented by that test shall at once be resampled and three more 
tests executed upon it. and if any of these three tests shall again exceed by 
more than 2 per cent the required standard, then that portion of the lot shall 
be rejected. 
If in any lot of brick two or more tests exceed the permissible maximum, 
then the buyer may. at his option, reject the entire lot. even though the average 
of all the tests executed may be within the required limits. 
Item 17. Fixing of standards. — The percentage of loss which may be taken 
as the standard will not be fixed in these regulations, and shall remain within 
the province of the contracting parties. For the information of the public the 
following scale of average losses is given, representing what may be expected 
of tests executed under the foregoing specifications : 
For brick suitable for heavy traffic. . . 
For brick suitable for medium traffic. 
For brick suitable for light traffic 
