1 Retort badly coated with carbon.
2 Coal had been weathered 15 months but was approximately air-dry when charged.
3 The meter readings for 10 minutes of this test are interpolated.

Coal FROM HARRISBURG, ILLINOIS. This coal (U. S. G. No. A. A. 12) was from Harrisburg, Saline County, Illinois, and was given one test (No. 35) last year under very unfavorable conditions, the interior of the retort being badly coated with carbon and its temperature being very low. Three tests on charges of 500, 400 and 300 pounds each, made consecutively, were added this year. The average composition of the coal used for the various tests and the condensed data for each test are given in Table II. The average result of all the tests is given below: Coke, per cent. ...

........ 62.2 Gas, cu. ft. per lb. coal .....

... 4.63 Candle power .............

15.2 Candle feet ...................

... 69.5 B. T. U. per cu. ft. of gas ......

.. 618.0 B. T. U. in gas from one pound of coal ........2862.0 NH3, lbs. per ton of coal ..

..... 5.54 Tar, gallons per ton coal .....

..... 14.5

..

........

COAL FROM Scott HAVEN, PENNSYLVANIA. A carload of this Pittsburg coal (U. S. G. No. A. A. I) was received in October of 1909. It was used in tests 18, 19, 20 and 32 reported last year, and a portion which had been weathered two winters was used for the consecutive tests 43, 44 and 45, the charges being 500, 400 and 300 pounds respectively. The average result of the seven tests is as follows: Coke, per cent. ...

....... 67.1
Gas, cu. ft. per lb. coal ......

5.12
Candle power ............ ............ 15.2
Candle feet .......................... ... 77.9
B. T. U. per cu. ft. of gas .....

. . 626.0
B. T. U. in gas from one pound of coal ........3208.0
NH3, Ibs. per ton coal ....................... 5.0
Tar, gallons per ton coal ..........

ton coal .................... 14.5 The condensed data for the various tests forms Table III, which also gives the average composition of the coal. It is not safe to ascribe any of the changes in results to weathering.

COAL FROM LAFOLLETTE, TENNESSEE. This coal from Rex No. 2 mine, LaFollette, Campbell County, Tennessee (U. S. G. No. A. A. 10), was used for one test No. 31 of last year. It was given a series of three consecutive tests this year on charges of 298, 400 and 500 pounds. It yields a large amount of gas of good candle power and heat value, but gives a poor grade of coke which is physically weak. The average result of the four tests is as follows: Coke, per cent. ...........

... 64.5 Gas, cu. ft. per lb. coal .......

5.51 Candle power .....

... 15.7 Candle feet ........

...... 85.1
B. T. U. per cu. ft. of gas ......

... 645.0
B. T. U. in gas from one pound of coal ........3555.0
NH3, lbs. per ton coal ....................... 6.42
Tar, gallons per ton coal .................... 17.3

Table IV gives the data of the individual tests and also the average composition of the coal.

COALS FROM MONANGAH AND HOLDEN, WEST VIRGINIA,

Two West Virginia coals were tested this year, which were so closely alike in chemical composition that they are here treated together, and indeed were actually mixed together on two tests, when there was an insufficient amount of either one alone for the purpose. The coal from Monangah, Marion County (U. S. G. No. A. A. 14) was only given one successful test. The coal from Holden, Logan County (U. S. G. No. A. A. 13) was used on two successful tests. It is worth recording that the only genuine naphthalene trouble, which the experimental plant has ever encountered, came while running a test on a 300 pound charge of this coal. The trouble was serious enough to make it necessary to discard the results of the test. These two coals were also used mixed in approximately equal amount to secure material for two consecutive tests on charges of 600 and 500 pounds. It is hardly fair to average these tests, but the data of each test will be found in Table V, where also is given the composition of the coals.

TABLE II

DATA OF TESTS ON COAL AA12 FROM HARRISBURG, ILL.

Data on Tests:

Test Test | Test Test
No. 35 | No. 46 No. 47 No. 48

Coal charged, Pounds.........
Average Temperature, Exterior of Retort, °F.....
Yields per pound coal as charged-

Gas, cu. ft. corrected........
Candle power, average.....
Candle feet .......................
BTU per cu. ft. gross....

Total BTU in gas from one 1b. coal.......
Yields per pound coal, M & A free-

Gas, cu. ft. corrected.....
Candle feet.
Total BTU in gas per Ib. coal, M & A free...

4.4
15.2
65.3
632.
2780.

4.70
15.8
74.3
608.

......................................

68.8

14.4
69.7
611.
| 2950.

TOSS...............................................

623.
2860.

4.94 1
75.1
3120.

5.07 5.30

77.6 1 83.8
3160. / 3220.

5.45
78.5
3330.

NH3 pounds per ton coal as charged.......
NH3 pounds per ton coal, M & A free...

Yields per hour

Duration of carbonization, hours......
Total cu. ft. of gas from charge..........
Av. cu. ft. gas per hour from charge........
Av. cu. ft. gas per lb. coal per hour.....
Av. cu. ft. gas per 1b. coal, M & A free, per hr

4.67
1741.
373.

.93
1.05

5.08
| 2248.

444.

4.58
1880.
412.

1.03
1.16

| 1448.

415.

89

1.38

1.00

1.56