306 ANNUAL REPORT 
5% feet in diameter and made one revolution in one minute and 30 
seconds. Each sample was analyzed. The results are given in the 
accompanying table: 
) ae g aE 
S eas e 5 ne Remarks. 
4 a =| 3 
Z a =< § is = Se 
Per cent | Per cent | Per cent | Per cent | Per cent 
1 B32 6.00 ADP? Qe BO) BO) I) 
| 
2 13.65 5.58 41.95 1.96 35.04 | > Bluish gray in color. 
3 14.38 5.70 41.63 1.88 34.84 
4°\ 13.55 6.30 } 41.98 Dr 33.46 | ) 
| 
5 14.33 Fi, Ze 44.05 OS 32.76 | } Yellowish color. 
| 
6 | 14.46 6.36 | 44.67 15895) 130256.) 
a 14.90 6.55 46.19 2.30 28.38 |) 
| 
8 16.44 6.99 49.25 2.23 29.94 | |} Yellow to brown, balls 
| soft. 
9 17.03 7.80 53.04 2730 18.44 | ) 
10 17.94 8.50 56.20 2.35 13.04 Bet. 10 and 11 mass 
hardens. 
11 18.60 9.04 59.00 2.70 8.82 Vitrified on outside. 
128 alSE6G 9.75 62.68 2.80 4.34 Brown, partially vitri- 
fied. 
13 19.90 10.76 63.38 QNSS 1.08 Decided difference, near- 
ly black. 
14 20.36 10.78 63.76 2 81 0.86 Black well burnt clinker 
It is thus seen that the vitrification proper must take place very rap- 
idly, being confined to the lower 12 feet of the kiln. 
Utilizing the Heat of Clinker,—3. The heat from the cooling 
clinker is an item which deserves some attention. Ina kiln of a capacity 
of 200 barrels per day, the clinker leaving at a température of 1220° C., if 
cooled down to 20° C. would represent an amount of heat equal to 
(380X 0.2 1200 X 200--2.2==8,304,000 ke. calories per day, theoretical- 
ly, which is equal to 1,186 kg. of coal with a calorific power of 7,000, or 
2,609 pounds of this coal. Where coal is cheap, say $1.00 per ton, as in 
Southeastern Ohio, where the cement company generally owns its own 
coal mines, the heat item is not an important factor and it is doubtful 
whether it would pay to install an expensive apparatus for saving any of 
this heat, especially since probably not more than 50 per cent. of it would 
be made useful. The extra cost of installment, the inconvenience of the 
