615
CEMENT EOCK,
Compression Tests of Cement Rook from which Newark and Rosendale Cement is made.
Samples dressed on a rubbing bed.
There were seams present in each sample before testing.
No. of test.	Description.	Dimensions.			Sec- tional area.	First crack.	Ultimate strength.	
		Height.	Compressed surface.				Total.	Per square inch.
10892 10393	Dark cement rock.. Light cement rock .	Inches. 2.44 2.18	Inches. 2.43 2.20	Inches. 2.42 2.18	. Sflinches. 5.88 4.80	Pounds. 56,000 166,000	Pounds. 182,000 196,200	Pounds. 30,950 40,875