CEMENT---SET AT DIFFERENT TEMPERATURES,
578
COMPARISON OF RESULTS ON SPECIMENS WHICH SET IN AIR AT BOTH 39° AND 70° •F. WITH THOSE WHICH SET IN AIR AT 70° F. ONLY, EXHIBITING THOSE OF THE SERIES WHICH SET THE LONGEST INTERVALS OF TIME AT THE TWO TEMPERATURES MENTIONED.
	Compressive strength per square inch.	
Brand.	Intervals at 39° and 70° F.	Interval at 70° F.
Star		Pounds. 3 mos. +14 days. 4,280	Pounds. 3 mos., 14 days. 4,410
Storm Iting		3 mos. +1 mo. 2,700	4 mos. 2,380
Alsen		3 mos. +1 mo. 6,400	4 mos. 3,510
Josson			3 mos. + 8 days. 4,970	3 mos. 3,110
Austin		3 mos. -f 15 days. 1,480	3 mos., 15 days. 580
Bonneville Improved		2 mos. +14 days. 1,970	2 mos., 14 days. 1,070
Bonneville Improved		3 mos. +13 days. 2,060	3 mos. 1,720
Hoffman		3 mos. +14 days. 1,470	3 mos., 15 days. 1,090
Norton		3 mos. + 7 days. 1,190	3 mos., 7 days. 924
Norton		3 mos. +14 days. 1,440	4 mos. 950
Obelisk		3 mos. +13 days. 2,150	3 mos., 14 days. 1,480
Means		2,737	1,929