Year: 1896

page_text: We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, of Holderness Foundry, in
the Town and County of Kingston-upon-Hull, Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to means for igniting the working charges employed in
operating hydrocarburetted-air engines where a tube open at one end to the motor
cylinder or combustion chamber is exposed externally to the heat of a lamp-flame and
thereby maintained at a high temperature.
The tube, to the interior of which the inflammable charge has access, is arranged
across the chimney of the heating lamp; and we have found that, in order to ensure
the best effect, the lower portion of the chimney which encloses the heating tube
should assume the form of a hollow truncated cone, having its larger diameter at the
base. After diminishing in diameter for some distance above the heating tube the
chimney again expands and may finally terminate in a parallel portion. In this
section is arranged a loose perforated baffle plate, the upper extremity being closed by
a loose perforated cover. Surrounding that portion of the conical part which encloses
the heating tube is a casing or shield, arranged to rotate and provided with a hole
about the level of the heating tube. The conical portion of the chimney is also
formed with a hole at the same level; the two holes when brought opposite one
another being so disposed and of such a size as to permit of the heating tube being
readily cleaned. Other ineans may, however, he employed for shielding the flame
from wind whilst permitting ready access to the heating tube.
In mounting the heating tube in the motor cylinder or combustion chamber and
across the lamp chimney, we form the inner extremity of the said tube with a collar
which fits a recess in the face of a plug which is screwed into the cylinder. The side
of the chimney is formed with a flange which, on being bolted to the plug, engages
with the collar of the beating tube and secures the latter in position gas-tight.
If preferred, a distance-piece may be introduced between the cylinder-plug and the
chimney-flange, the neck of the distance-piece being provided with a cock for
controlling the passage of the working charge to and from the heating tube.
Portions of the chimney are furnished with asbestos linings to protect them from
the effects of excessive heat.

page_text: COMPLETE SPECIFICATION.
Improvements in Igniting Devices for Hydrocarburetted-air Engines
We, WILLIAM DENT PRIESTMAN and SAMUEL PRIESTMAN, of Holderness Foundry, in
the Town and County of Kingston-upon-Hull, Engineers, 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 :-
This invention relates to means for igniting the working charges employed in
operating hydrocarburetted-air engines where a tube open at one end to the motor
cylinder or combustion chamber is exposed externally to the heat of a lamp-flame and
thereby maintained at a high temperature.
An ignition tube, arranged according to our improved method is illustrated in the
accompanying drawings, whereof Fig. 1 is a vertical section and Fig. 2 a side eleva-
tion.
The tube A, to the interior of which the inflaminable charge has access, is arranged
across the chimney B of the heating lamp C; and we have found that, in order to
ensure the best effect, the lower portion of the chimney which encloses the heating
tube should assume the form of a hollow truncated cone, having its larger diameter at
the base. After diminishing in diameter for some distance above the heating tube
the chimney again expands and may finally terminate in a parallel portion as shewn
at B. In this section is arranged a loose perforated baffle plate b, the upper
extremity being closed by a loose perforated cover b¹. Surrounding that portion of
the conical part which encloses the heating tube is a casing or wind-shield, 62,
arranged to rotate, and provided with a hole about the level of the heating tube.
The conical portion of the chimney is also formed with a hole at the same level; the
two holes when brought opposite one another being so disposed and of such a size as to
permit of the enclosed parts being readily cleaned. Other means may, however, be
employed for shielding the flame from wind whilst permitting ready access to the
lamp and heating tube.
In mounting the heating tube in the motor cylinder or combustion chamber and
across the lamp chimney, we form the inner extremity of the said tube with a collar
which fits a recess in the face of a plug which is screwed into the cylinder, or a
distance-piece may be introduced between the collar and the plug as illustrated in the
present design; the neck of the distance-piece being provided with a cock for
controlling the passage of the working charge to and from the heating tube. a is
the collar upon the extremity of the heating tube, d is the plug for screwing to the
cylinder, e is the distance-piece fitted with a plug e¹. The side of the chimney is
formed with a flange 64 adapted for being bolted to the flange e2 or to the plug d, as
the case may be, thus securing the heating tube in position gas tight.
Portions of the chimney are furnished with asbestos linings to protect them from
the effects of excessive heat.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we claim :-
For use in hydrocarburetted-air engines, the improved igniting device constructed
substantially as herein described and comprising a tube, open at one end to the motor
cylinder or combustion chamber, and arranged across the chimney of a heating lamp,
the portion of the said chimney enclosing the tube being formed as a truncated cone

page_text: having its larger diameter below the level of the said tube whilst its smaller diameter,
above the level of the tube, communicates with an expanded chamber.
Dated the orth drow of trust 1907
For the Applicants,
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent.