NEW JERSEY BRICKMAKING INDUSTRY. 257 



Comments on brick tests. — In studying the above tests a 

 number of interesting points are to> be noted. 



1. Taking the two largest groups of bricks as a whole, that is, 

 the stiff -mud brick and the soft-mud brick, we find that the crush- 

 ing strength in the former ranges between 1,694 and 13,873 

 pounds per square inch, with an average of 4,856 pounds, while 



LBS 

 6OOO 



550O 



So OO 



4500 



4-0OO 



3500 



3 OOO 



2500 



ZOOO 

 1500 



/OOO 



500 



SOFT MUD BRICK 



















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ng.z 



Z 3 4 5 6 7 8 9 10 II l 



*>8. Diagram showing Jack of close agree, 

 between crushing strength and trans ye 

 strength. 



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me/it 

 rse 



the latter range from 661 pounds to 5,909 pounds per square inch, 

 with an average of 3,703 pounds. Even if the two> exceptionally 

 high tests, Nos. 1 and 12, are deducted, the average of the stiff- 

 mud crushing tests still remains higher, being 4,055 pounds. 

 2. Comparing the transverse tests in the same manner, we find 

 17CLG 



