AN IMPROVED BLAST OR EXHAUST APPARATUS FOR LOCOMOTIVE ENGINES
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by William Robert Lake at the Office of
the Commissioners of Patents on the 31st March 1880. A communication from
abroad by John E. Martin, of the United States of America, now of Concepcion,
in the Republic of Chili, Engineer.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. AN IMPROVED BLAST OR EXHAUST APPARATUS
FOR LOCOMOTIVE ENGINES." [A communication from abroad by John E. Martin,
of the United States of America, now of Concepcion, in the Republic of Chili,
Engineer.]
This Invention relates to exhaust apparatus or blast pipes for locomotive engines,
and is designed to be applied to and used with the engine in the usual manner.
In carrying the said Invention into practice I employ two blast pipes, that is to
say, a double pipe combined with a single pipo of larger diameter, so that tho
double pipe discharges within the single pipe.
The lower end of the double pipe (two pipes coupled together) is connected to
the exhaust pipes as usual. The upper end is secured to and discharges within the
base of the single pipe, which may have a reducer at its mouth. The discharge
aperture of each part of the double pipe or nozzle may be 41%, inches in diameter,
and that of the single pipe or nozzle, say, 6 inches without reducer. The major
diameter of the single pipe at its base where the double nozzle enters will be more
than twice the major diameter of each part of the double pipe. The area of the
orifices of the double pipe are of a size proportionate to their duty; that of the
single pipe should be the same size or larger than those of the double pipe;
proportions will be varied to suit size of engine and duty to be performed.
This improved blast apparatus is usually made in two parts for convenience of
construction.
-
The advantages of the said Invention are as follow, that is to say:-
First. The steam will not "blow over" from one cylinder to the other and
produce "back pressure" as in the single form of nozzle.
Second. The effect of the blast on the fire is very mild, being much milder than
with the ordinary single or double form.
Third. The vacuum in the smoke box being constant and very low, the
locomotive will throw little or no burning coal from tho stack or chimney even
with heavy trains, and as a consequence a spark-arresting apparatus is not
required.

page_text: Fourth. By reason of the mild effect of the blast on the fire a longer period of
timo is given the gases to become more perfectly consumed in the fire-box than
would otherwise be the case, and the evaporation of water per pound of fuel is
greatly increased.
Fifth. By dispensing with spark-arresters and other obstructions to the draught 5
much larger exhaust nozzles of pipes can be used, the exhaustion of steam from the
cylinder being made perfect or nearly so, and the power of the locomotive much
increased.
Sixth. By decreasing the quantity of cinders drawn through the tubes and
thrown against the sides of the fire box (this is accomplished by a mild draught), 1
the need of repairs to these parts is materially lessened.