Improvements in Vertical Tubular Boilers.
Year: 1894

page_text: Date of Application, 3rd May, 1894
Complete Specification Left, 13th Nov., 1894-Accepted, 15th Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in Vertical Tubular Boilers.
I, ELLIS FREEMAN EDGAR, of Woodbridge, in the County of Middlesex, and.
State of New Jersey, United States of America, Engineer, do hereby declare the
nature of this invention to be as follows :-
:-
The present invention relates to improvements in vertical tubular boilers, and it
consists in interposing in each tube a retarding wall substantially at the water line
of the boiler, so as to partially obstruct the draft through such tubes, with each of
which is combined a surrounding circulating tube starting from a point slightly
above the tube sheet at the furnace end and proceeding up to slightly above the
water line.
A priming plate is arranged a short distance above the top of the circulating
tubes and has an annular clearance all round at the outer shell for the passage of
the steam into the steam space, so that the steam passes into the latter in a dry
condition.
The construction of tubes with retarding walls described enables much larger
tubes than hitherto to be employed, and a more efficient boiler is produced.
A single vertical boiler of the construction described may be employed, or a
"bench of same may be fitted to a single or divided furnace.
Dated this 3rd day of May 1894.
ALLISON BROS.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Vertical Tubular Boilers.
I, ELLIS FREEMAN EDGAR, of Woodbridge, in the County of Middlesex, and
State of New Jersey, United States of America, Engineer, do hereby declare the
nature of this invention, and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
The present invention relates to improvements in vertical tubular boilers, and it
consists in interposing in each tube a retarding wall substantially at the water line
of the boiler, so as to partially obstruct the draft through such tubes, with each of
which is combined a surrounding circúlating tube starting from a point slightly
above the tube sheet at the furnace end and proceeding up to slightly above the
water line.
A priming plate is arranged a short distance above the top of the circulating
tubes and has an annular clearance all round at the outer shell for the passage of
the steam into the steam space, so that the steam passes into the latter in a dry
condition.
The construction of tubes with retarding walls described enables much larger
tubes than hitherto to be employed, and a more efficient boiler is produced.
A single vertical boiler of the construction described may be employed, or a
"bench" of same may be fitted to a single or divided furnace.
The invention is illustrated in the accompanying drawings in which
Fig. 1 is a vertical section of a single boiler, and
Fig. 2 a horizontal section on a larger scale through one of the boiler tubes.

page_text: A are the fire tubes in each of which a plug or retarding wall B is arranged at
substantially the water line of the boiler, a draft area being left round its edge
between such edge and the interior of the fire tube. In a 5 inch tube such draft
area will be about of an inch. The fire tubes are spaced on the tube sheets
about 2 inches apart.
A circulating tube C surrounds each fire tube, same extending up as high as or a
little above the water line, down to about 1 inch from the tube sheet D at the
furnace end.
The priming plate E is placed about 3 inches above the top of the circulating
tubes C, and has an annular clearance e all round at the outer shell F of the boiler
for the passage of the steam into the steam space G.
The priming plate E has openings e in it which are fitted with annular covers or:
washers H, such openings e¹ serving to permit of the insertion and withdrawal of
the circulating tubes C.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I'
claim is :-
In a vertical tubular boiler the combination of a noncombustible plug located in
the fire tubes, substantially at the water line, with a circulating tube around said
fire tube, and a priming plate, all substantially as shown and described.
Dated this 13th day of November 1894.
ALLISON BROS.,
Agents for the Applicant.