46 BULLETIN 555, U. S. DEPARTMENT OF AGRICULTURE. 
(3) Where and how taken. — 
(a) Sampling for quality: Samples shall be taken either from the deposit or 
from cars, as directed by the engineer, and shall be representative of that which 
it is proposed to use. Mixed samples may be taken if deemed necessary by 
the engineer. 
( b ) Sampling for size : Samples of the crusher product shall be taken either 
at the crusher or from cars as directed by the engineer. The samples shall be 
mixed from runs of the crusher on different days, or, if taken from cars, shall 
be taken from both ends and top and bottom of the car. 
(4) Amount and size of sample. — 
(a) Sampling for quality: A sample shall weigh between 25 and 40 pounds 
and shall consist of pieces of slag at least li inches in size, and one piece at 
least 3 by 4 by 6 inches. 
( b ) Sampling for size : A sample for size shall weigh not less than 10 pounds 
for material of three-quarters inch maximum diameter or less. Samples of 
materials of other sizes shall increase in weight to a maximum of approximately 
60 pounds, varying with the size and weight of the largest pieces represented 
by the sample. The sample shall be representative of the product as delivered 
for use. 
(5) Marking and shipping. — Samples shall be shipped in tight boxes or bags 
and shall be accompanied by a card in the container or securely attached 
thereto, stating date, by whom taken, by whom submitted, source of supply, 
exact location where sample was taken, proposed purpose to which the material 
is to be put, space for remarks, and, in case of source investigations, owner, 
quantity available, whether material from the same source has been previously 
used, where and for what purpose, and with what results, haul to nearest point 
on road, average haul to job, character of haul, initial cost of slag. 
Notification of sampling, containing the above data, shall be forwarded sepa- 
rately to the laboratory immediately upon taking the sample. 
Note. — The conference, recognizing that in general slag is not a uniform 
product, recommends that special care should be taken to get a representative 
sample. 
Sampling Stone Block. 
(1) By whom taken. — Samples are to be taken by the engineer or his author- 
ized representative. 
( 2 ) When taken.— Samples are to be taken at least days before the block 
is to be accepted or rejected, or when the quality or appearance of the block 
changes, and at such other times as may be directed by the engineer. 
(3) Where and how taken. — Samples shall be taken either from the quarry 
or from cars, as directed by the engineer. They shall be representative of the 
block which it is proopsed to use ; and no sample shall include blocks that would 
be rejected by a visual examination. 
(4) Amount and size of sample. — The sample shall consist of at least 10 
blocks. The bedding plane shall be marked on at least 2 blocks. 
(5) Marking and shipping. — Samples shall be shipped in tight boxes and 
shall be accompanied by a card in the container, or securely attached thereto, 
stating date, by whom taken, b^ whom submitted, source of supply, exact loca- 
tion where sample was taken, proposed purpose to which the material is to 
be put, whether material from same source has been previously used, where 
and for what purpose and with what results, initial cost of block, haul to 
nearest point on road, average haul to job, character of haul, and space for 
remarks. 
Notification of sampling, containing the above data, shall be forwarded 
separately to the laboratory immediately upon taking the sample. 
