74 THE TESTING OF ROAD MATERIALS. 



J 



FORMS FOR REPORTING RESULTS OF TESTS, ETC. 



INSTRUCTIONS FOR SELECTING AND SHII'PIN<; SAMPLES. 



In order to have road materials tested in the laboratory of the Department of 

 Agriculture, the instructions below must be carefully followed: 



1. All samples should be selected to represent as nearly as possible an average <>f 

 the material. 



2. A sample of rock for laboratory test must consist of stones which will pass 

 through a 3-ineh but not through an inch and a half ring excepting one piece, which 

 should measure, approximately, 4 by 6 inches on one face and be about 3 inches 

 thick. The whole sample should weigh not less than 30 pounds. It is desin-<! that 

 samples of rock be shipped in burlap bags. 



3. A sample of gravel must weigh not less than 25 pounds, and should not contain 

 stones over 1 inch in diameter. Such samples must be shipped in boxes, sufficien 

 tight to prevent the finer material from sifting out. 



4. A sample of paving brick must contain 36 whole bricks, or 24 blocks, w 

 must be securely packed in a box for shipment. 



5. A blank form and addressed tag envelope will be supplied by the Department 

 for each sample. The blank form must be filled and placed in the tag envelo 

 which must be used as the address for the sample. It is essential that these 1 

 forms be filled with the utmost care, as they are filed as records of the samples. 



i). The Agricultural Department desires to keep a record of the actual wear 

 mads built of the materials tested. If the material which this sample rep 

 has been, or is about to le. used on roads, this laboratory desires to be informed of 

 the addresses of those in charge of the construction and maintenance of such roads. 



7. Samples must be shipped, freight or expressage prepaid, and bills of lading or 

 express receipts forwarded by mail to the Road Material Laboratory, Bureau of 

 Chemistry, I". S. Department of Agriculture, Washington, D. C. 



SHIPPING BLANK. 



1. The sample about to be shipped is from the State of . County 



Town or city . 





2. It comes from the property of 



'.'>. If mck, about how many cubic yards are available? . 



-I. Name and address of per.-on sending sample: - . 

 hate of -hipment: - ,19 . 



6. Is test desired by a private person, municipality, or company? . 



7. Name of peiron, municipality, or company : - . 



B. [a material intended for general sale to the public? . 



9. Has material l.een used <ui roads? Jf so, where? . 



If a judgment of sample's litnrss for :i particular road is desired, further del 

 must l>e '.riven, and Form No. ."> will be mailed to yon for this purpose. 



I'M M'T UlUTi: UKI.OW THIS LINK. 



Mate received at laboratory: , 19 . Sample No. . 



Tests made on siniplr: - . Abrasion No. . Result:- . Cementation 



. . Result:- . Toughness No. . Result: . Hardn. No. . 



Result:- . Density No. - . Result:- . 



Name of material: - . 

 Other tests: - . 



Condition of sample: . 



KKMAKKS: . 



