88 PRELIMINARY REPORT ON OOAL-TESTING PLANT, [bull.* 
ing before beginning the official records of the tests. This is due 1 
the fact that each test is made on a new coal, whose working qualith 
in the producer are entirety unknown. The operation of the g\ 
engine upon gases from different coals requires careful study in ord« 
to secure the best mixture, proper point of ignition, etc. It has ther 
fore been decided, should the operation of the plant be continue* 
that seventy-two consecutive hours shall be allowed for each tes 
During the first eight to twelve hours the operators of the produc< 
and engine will devote their entire attention to securing the best po 
sible manipulation of the plant, thus insuring sixty hours for obtainir 
results of high economy as well as testing the endurance of the plan 
RESULTS OF THE TESTS. 
The first official producer-gas test began October 3, 1904, and betwe( 
that date and December 22 eighteen coals were tested. The resul 
are given briefly in the following pages. 
The brief notes appended to the reports of each test give an idea 
the operating qualities of the coals from the standpoint of the expe 
in charge of the producer. 
COAL, ALABAMA NO. 2; PRODUCER-GAS TEST NO. 2. 
[Coal from mine No. 5 of the Galloway Coal Company, Carbon Hill, Ala.; tested October 10, 11, 12, 
14, 1904.] 
Duration of test hours . . 43 
Total coal consumed in producer pounds. . 13, 350 
Moisture in coal per cent. . 3. 
Dry coal consumed in producer pounds.. 12, 848 
Refuse from dry coal per cent. . 9. 
Total refuse from coal pounds. . 1, 315 
T< >tal combustible " consumed in producer do 12, 035 
Coal consumed, pounds per hour. 
Coal consumed in producer 310 
Dry coal consumed in producer 299 
Combustible consumed in producer 280 
Equi valent coal & used by producer plant 341 
Equivalent dry coal used by producer plant 328 
Equivalent combustible used by producer plant 306 
Britisli thermal unit*. ' 
Per pound of coal 12,86£ 
Per pound of dry coal 13, SGI 
Per pound of combustible 14, 82C 
Per cubic foot of standard gas 141 
From standard gas d per pound dry coal burned in producer 9, 00( 
From standard gas per hour per brake horsepower 11, 42( 
a " Combustible " is dry coal minus refuse. 
&" Equivalent coal" is coal actually consumed in producer plus the coal equivalent of the si 
-used in operating the producer. 
'■ A " British thermal unit" is the heat required to raise 1 pound of water from 62 v. to U3° F. 
<!■■ Standard gas " is gas at 62° F, and 14. 7 pounds pressure. 
