Petroleum as Fuel, 17 
into which the coil is inserted, to the furnace door, and 
thence to the steam space of a small auxiliary boiler; a 
branch, with proper valves, K, connects this pipe with the 
steam space of the main boiler—the flow of steam being 
also regulated by a stop-cork, H, placed in the vicinity of 
the furnace door, near the oil cock. 
13 ft. 9 ¢n. 
The water in the boiler being cold (sixty degrees), at 
fifteen minutes past two p.m., some billets of pine wood 
and shavings, weighing about twelve pounds, being placed 
pon 1 the coil, near the furnace door, were lighted and the 
door partially closed; after an interval of fifteen minutes 
the oil cock, MW, was gradually opened, which permitted a 
flow of oil from the reservoir through the coil ; simultaneous 
with which, or a little later, the steam cock, 17, was opened, 
which conveyed steam of about twenty pounds pressure 
from the auxiliary boiler, through the heated steam pipe, 
NEW SERIES.—VOL. I, ; Cc 
