70 BULLETIN 949, U. S. DEPARTMENT OF AGRICULTURE. 



(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 ] \ 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, vary- 

 ing 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 quarry 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 separately 

 to the laboratory immediately upon taking the sample . 



The conference, recognizing that in general slag is not a uniform product, recom- 

 mends that special care should be taken to get a representative sample. 



54. SAMPLING STONE BLOCK. 



(1) By whom taken. — Samples are to be taken by the engineer or his authorized rep- 

 resentative. 



(2) Whin 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 quany or from 

 cars, ad directed by the engineer. They shall be representative of the block which it 

 is proposed to use; and no samples 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, by whom submitted, source of supply, exact location 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. 



55. SAMPLING GRAVEL. 



(1) By whom taken. — Samples are to be taken by the engineer or his authorized rep- 

 resentative. 



(2 > When taken. — Samples are to be taken from the proposed source of supply at 

 least days before the gravel is to be accepted or rejected, also from every 



