BULLKT1V 1216. r. S. DEPARTMENT OF ACRKTT.TrRK. 
Samples 
from cars. 
Shipment 
of samples. 
Storage of 
samples. 
should l»e selected as in the case of samples taken from kilns, 
each sample to represent about 10,000 brick. When the surface 
appearance of the brick docs not furnish any indication of their 
uniformity, samples are to be taken at random representing ap- 
proximately 10,000 brick. 
(c) Samples from cars. — When a sample is taken from a carload 
if shall be selected in the same manner as previously described 
to represent three approximate degrees of burning. 
29. Shipment of sample*. — Samples winch must be transported 
long distances by freight or express shall be carefully put up in 
packages holding not more than 12 brick each. When more than 
6 brick are shipped in one package, it shall be so arranged as to 
carry two parallel rows of brick side by side, and these rows shall 
be separated by a partition. In event of some of the brick being 
cracked or broken in transit, the sample shall be disqualified if 
there are not remaining 10 sound, undamaged brick. 
30. Storage and care of samples. — Samples shall be carefully 
handled to avoid breakage or injury. They shall be kept in the 
dry so far as practicable. If wet when received, or known to 
have been immersed or subjected to recent prolonged wetting, 
they shall be dried for at least six hours in a temperature of 100° 
F. before testing. 
VII. GENERAL DIRECTIONS FOR SHIPPING AND MARKING SAMPLES. 
Shipment 
of sample. 
Information 
with sample. 
The machine. 
Test sample. 
31. Samples of ledge stone, crushed stone, and slag shall be 
shipped in a secure box or bag. 
.">:i. Samples of stone block shall be securely crated. 
33. Samples of run-of-bank gravel, sand screenings, and other 
fine material shall be shipped in a tight box or closely woven 
bag so there shall be no loss of the finer particles. 
34. Each sample or separate container shall be accompanied 
by a card or regular form, preferably in the container, giving 
the following information: By whom taken; official title or rank 
of the sampler; by whom submitted; source of supply; proposed 
use of the material; and in case of commercial supplies, daily 
production; geographic location; shipping facilities (name of rail- 
road, canal or river, or other common carrier) ; and price of the 
material. 
ABRASION TEST FOR BROKEN STONE. 
(A. S. T. M. standard method, serial designation D 2-08, slightly modified.) 
(1) The machine shall consist of one or more hollow iron 
cylinders, closed at one end and furnished with a tightly fitting 
iron cover at the other; the cylinders to be 20 centimeters in 
diameter and 34 centimeters in depth inside. These cylinders 
are to lie mounted on a shaft at an angle of 30° with the axis 
Of POtal ion of the shaft. 
('_') The rock to be tested shall be broken from large pieces 
to as nearly uniform size and shape as possible, and as near to 
50 pieces as possible shall constitute a test sample. No pieces 
with edges or faces that have been rounded by wear shall be in- 
cluded The total weight of rock in a test shall be within 10 
grams of 5 kilograms. All test pieces shall be washed and 
thoroughly dried before weighing. Ten thousand revolutions, at 
the rate of between 30 and 33 per minute, shall constitute a test. 
Only the percentage of material worn off which will pass through 
a 0.10 centimeter ( <>no-si\teonth inch) mesh sieve shall be con- 
sidered in determining the amount of wear. This shall be ex- 
pressed as the percentage Of the 5 kilograms used in the test. 
(3) "When the material has a specific gravity below 2.20 the 
quantity used for the test shall be adjusted on a weight basis, 
retaining the specified number of pieces. For such materials a 
weight of 4,000 grams of the broken stone or broken slag shall 
be used. 
(4) The results shall be reported as per cent of wear. 
