Petroleum as Fuel. 15 
New York, and the crude petroleum, without other fuel 
than the chips for kindling the fires, has been burnt under 
a marine boiler, in a course of experiments extending from 
the month of May last, and proves more manageable, more 
under the control of the fireman, and develops an amount 
- of heat greater than any fuel with which we are acquainted. 
Mr. George W. Quintard, of the Morgan Iron Works, 
having offered us the use of a Marine boiler for our experi- 
ments, we applied our apparatus to it, without regard to 
any disproportion which might exist between the two; 
further experiments being needed in order to determine 
their precise relative dimensions. The experiments thus 
far have not extended beyond the determination of the 
fact that Petroleum may be used with great facility as a 
fuel under steam boilers, by a single fireman of ordinary 
intelligence. No minute analysis has been made of its 
comparative economy—the results thus far being regarded 
as merely general; but from the results herewith shown, 
you will be enabled to determine how far our experiments 
sustain the claim we have advanced or having successfully 
applied this material to steam boilers. | 
The boiler used was an internal flue and return fire-tube 
boiler, the shell measuring thirteen feet and nine inches in 
length, by six feet in diameter, with a grate-surface of 
thirty-five square feet; contents about fifteen hundred 
gallons of water to the level of six inches above the upper 
line of tubes. There were three flues in the boiler, the 
centre one, P, of 16 inches diameter, and the other two, &, 
of 12 inches diameter. The boiler was not set as repre- 
sented in figures 1, 2 and 3, which is the method recom- 
mended; but rested merely on three walls of the dimensions 
of the furnace walls. There were five rows of 24 inch fire- 
tubes, as shown in figure 2, being 75 tubes in all; the back 
connection being 15 inches by 3 feet 5 inches, and the 
smoke stack 30 inches in diameter. The boiler was un- 
clothed. Fig. 1 represents the plan of the furnace, show- 
ing the arrangements of the retort or mixer, and the oil 
and steam-tubes. Fig. 2 is across section of the boiler 
through the furnace, and figure 3 is a longitudinal section 
through the centre of the boiler and furnac The same 
letters refer to the same parts in the several figures. 
The fire bars were removed, and in their place a coil of 
three-quarter inch wrought iron pipe, A, was inserted, the 
total length of pipe in the coil being twenty-three feet; at 
the back, directly across the furnace, a wrought iron. tube, 
