. The railroad and engineering journal . fires, and beltercombustion can be attained. For marine engines, how-ever, they are impracticable, as the rolling of a vesselmakes the regulation ot the quantity of oil that shouldoverflow from one step to the other impossible. 3. Drip fires were first tried in 1S65, and a system in-vented by M. Audouin (fig. 2) was shown at the Paris Ex-position of 1867. M. Audouin, who was a gas engineer,attached particular importance to the use of the heavy taroils, and placed a pipe of pottery-ware, irom 30 to 40 , in the grate, with a view to keep up a suffi
. The railroad and engineering journal . fires, and beltercombustion can be attained. For marine engines, how-ever, they are impracticable, as the rolling of a vesselmakes the regulation ot the quantity of oil that shouldoverflow from one step to the other impossible. 3. Drip fires were first tried in 1S65, and a system in-vented by M. Audouin (fig. 2) was shown at the Paris Ex-position of 1867. M. Audouin, who was a gas engineer,attached particular importance to the use of the heavy taroils, and placed a pipe of pottery-ware, irom 30 to 40 , in the grate, with a view to keep up a sufficientlyhigh temperature to disperse and consume the oil. Inplace of a door to the fire-box, a plate was attached, to Vol. LXII, No. 4.] ENGINEERING JOURNAL. 165 which were affixed at the top and in the center rows ofsmall iron pipes. Each pipe had a tap, and could be cutoff from tlie supply pipe leading from the oil tank. Tothe mouths of the pipes a vertical groove was fitted, downwhich the ignited oil was conducted. In the case of sta-. tionary boilers, Audouin allowed the oil to flow from thesupply pipe in a canal along the plate, from which it over-flowed into the vertical grooves. This, of course, neces-sitates only one supply pipe and one regulating tap. Theplate that takes the place of the door has openings between the grooves for admission of air. Theair supply is regulated by a valve, movable in sections,and fitted in front of the openings. The chimney draft isequal to an air pressure that would raise a column ofwater in., and Audouin claims to have evaporatedabout to 33 lbs. of water wilh lbs. of heavy tar oilin a longitudinal boiler walled in, with internal firing anda wheel draft, which did a duty of about 20 Drip fires invented by MM. St. Claire-Deville and Dupuyde Lome, whose plans were based on the system ofAudouin, were applied in 186S to the boilers (fig. 3) of theimperial yacht Pucbla, the fire-door and fire-bars of whichwere takg
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