IMPROVE- MENTS IN LAMPS FOR VARIOUS USES AND IN MANUFACTURING THE SAME
Year: 1884

page_text: I, THOMAS COOPER JOHN THOMAS of N° 54 Minories in the County of
Middlesex, Engineer do hereby declare the nature of said invention for "IMPROVE-
MENTS IN LAMPS FOR VARIOUS USES AND IN MANUFACTURING THE SAME," to be
as follows:
In the specifications of former Patents granted to me and being respectively
No 688 dated 19 Feb 1878 and N° 2604 dated 26 June 1880 are described various
constructions of lamps having metal chimneys and reflecting chambers of conical
parabolic or like form arranged with their axes horizontal and with their smallest
diameters or ends next the chimneys or within the lamp cases or bodies and their
largest diameters or ends (which are suitably glazed) outward, so as to give an
outward direction to light emanating from the flame of the lamp.
Now my present invention has reference to lamps of such or similar kinds.
In such a lamp in order to secure in place the chimney and the reflecting
chamber or chambers attached thereto in such a manner that the same can be
readily removed for any purpose from the lamp case or body I provide the
reflecting chamber (or in some cases each of them if there be more than one)
with a flange plate projection or projections at or near the outer or large end
thereof and in the lamp case or body, or in or on the door thereof I provide
grooves or guides wherein the said flange or plate or projection or projections or
portions thereof can slide:-the arrangement being such that when the chimney
with its attached reflecting chamber or chambers is in position for use in the lamp
case or body it, will be securely retained in place, and that if it be desired to with-
draw the chimney and reflecting chamber or chambers this can be readily done
by a simple upward sliding movement.
With this arrangement the lower end of the chimney can be used to lock the oil
tank in the lamp case or body, in such a way nevertheless that the said tank can
be released and taken out by slightly raising the chimney (and with it the
reflecting chamber or chambers attached to it) by sliding the same.
The arrangement described above may be modified by providing the reflecting
chamber or chambers with grooves and the lamp case or body or door with
projections to enter such grooves.

page_text: When two chambers are used they can conveniently be of parabolic form and be
joined together at their smallest ends and placed in the lamp case or body with
their axes horizontal and their largest diameters against opposite sides of the said
case or body as described with reference to the conical chambers illustrated in
Figs 1 and 2 of the drawings of the specification of my former patent No 688 of
1878 above referred to but so nevertheless that they and the chimney and burner
attached to them can be slidden out of the lamp case or body as hereinabove
described.
In order to cheapen the production of lamps such as hereinabove described or
referred to I make the metal chimneys and reflecting chambers as follows:-
I stamp out of one piece of metal one half or thereabout of the chimney and
one half or thereabout of the wall of the reflecting chamber or of each reflecting
chamber when there are two. I then join together two such stamped pieces by
any suitable means such as rivetting or brazing, it being understood that the joints
run lengthwise of the chimney and chamber or chambers. The joints may be lap
joints or butt joints. After the junction has been effected the inner surface or
surfaces of the chamber or chambers and also sometimes part of the inner surface
of the chimney is or are rendered highly reflective by any suitable means such as
nickeling or silvering as well understood.
The above process of manufacture in two main parts will present considerable
advantage as compared with the usual mode of making the chambers and chimney
each separately and afterwards joining them,

page_text: "
I, THOMAS COOPER JOHN THOMAS, of N° 54 Minories, in the County of
Middlesex, Engineer, do hereby declare the nature of my invention for "IMPROVE-
MENTS IN LAMPS FOR VARIOUS USES AND IN MANUFACTURING THE SAME and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:—
In the specifications of former patents granted to me and being respectively
No 688 dated 19 Feb 1878 and No 2604 dated 26 June 1880 are described various
constructions of lamps having metal chimneys and reflecting chambers of conical
parabolic or like form arranged with their axes horizontal and with their smallest
diameters or ends next the chimneys or within the lamp cases or bodies and their
largest diameters or ends (which are suitably glazed) outward so as to give an
outward direction to light emanating from the flame of the lamp.
Now my present invention has reference to lamps of such or similar kinds.
In such a lamp in order to secure in place the chimney and the reflecting chamber
or chambers attached thereto in such a manner that the same can be readily.
removed for any purpose from the lamp case or body I provide the reflecting
chamber (or in some cases each of them if there be more than one) with a flange
plate projection or projections at or near the outer or large end thereof and in the
lamp case or body, or in or on the door thereof I provide grooves or guides wherein
the said flange or plate or projection or projections or portions thereof can slide,
the arrangement being such that when the chimney with its attached reflecting
chamber or chambers is in position for use in the lamp case or body it will be
securely retained in place, and that if it be desired to withdraw the chimney and
reflecting chamber or chambers this can be readily done by a simple upward
sliding movement.
With this arrangement the lower end of the chimney can be used to lock the oil
tank in the lamp case or body, in such a way nevertheless that the said tank can
be released and taken out by slightly raising the chimney (and with it the reflecting
chamber or chambers attached to it) by sliding the same.
When two chambers are used they can conveniently be of parabolic form and be
joined together at their smallest ends and placed in the lamp case or body with
their axes horizontal and their largest diameters against opposite sides of the said
case or body as described with reference to the conical chambers illustrated in
Figs 1 and 2 of the drawings of the specification of my former patent No 688
of 1878 above referred to but so nevertheless that they and the chimney and
burner attached to them can be slidden out of the lamp case or body as herein-
above described.
.
In order to cheapen the production of lamps such as hereinabove described or
referred to I make the metal chimneys and reflecting chambers as follows:-
I stamp out of one piece of metal one half or thereabout of the chimney and one
half or thereabout of the wall of the reflecting chamber or of each reflecting
chamber when there are two. I then join together two such stamped pieces by any
suitable means such as rivetting or brazing, it being understood that the joints run
lengthwise of the chimney and chamber or chambers. The joints may be lap joints
or butt joints. After the junction has been effected the inner surface or surfaces of
the chamber or chambers and also sometimes part of the inner surface of the
chimney is or are rendered highly reflective by any suitable means such as
nickeling or silvering as well understood.
The above process of manufacture in two main parts will present considerable
advantage as compared with the usual mode of making the chambers and chimney
each separately and afterwards joining them.

page_text: In the accompanying sheet of illustrative drawings, Fig 1 is a vertical section of
a lamp embodying my improvements and Fig 2 is a side view of a lamp case
adapted to receive the same. Fig 3 is a vertical section of a modified form of lamp
and lamp case and Fig 4 is a view of the same opened. The remaining figures are
hereinafter referred to..
a is the lamp case, and 6 the lamp proper arranged to slide therein. c'is the
chimney of the lamp and d. d are the reflecting chambers which in the example
illustrated in Fig 1 are of parabolic form. The reflecting chambers are formed
with the chimney in the manner hereinafter set forth. e. e. are flanges or plates at
the outer or large end of the chambers d'and f. f. are grooves or guides on the lamp
case or body wherein the flanges or plates e. e can slide vertically and be securely
retained to hold the attached parts in position for use. If it be desired to remove
the chimney and chambers for any purpose these connected parts are simply raised
upward as indicated in dotted lines in Fig 1. the attached flanges or plates e. e
sliding within the grooves or guides f. f. b* is a burner cone secured to the
reflecting chambers d by soldering or otherwise; it fits over the burner g of the
lamp b when it and the attached chimney and reflecting chambers are in their
lowest positions the said burner cone 6* then serving to lock the oil tank or lamp
in its place within the lamp case. If it be desired to remove the tank it is only
.necessary for this purpose to raise the chimney and attached reflecting chambers
and burner cone a short distance so as to release the tank. 1. l are sheets of glass
suitably carried by and at opposite sides of the lamp b. When the reflecting
chambers are in their lowest position they form with the panes of glass closed
combustion chambers.
In the modification illustrated in Figs 3 and 4 the lamp proper is carried by the
door of the lamp case as seen clearly in Fig 4 which shows the door of the case in
its open position. One reflecting chamber only is here employed. It is of
rectangular form in transverse section. c. e are the flanges or projecting plates of
the chamber and f. f the grooves or guides wherein they slide secured to the door h
of the lamp case a. The lower end c*. of the chimney in this modification is
extended so as to fit over the burner of the lamp b and lock the latter in position
i is a shelf for carrying the lamp b; it is connected by brackets to the
door of the lamp case a. m is a chimney suspended in the head of the lamp.
7 is a pane of glass in the door.
for use.
The arrangement just described may be modified by providing the reflecting
chamber or chambers with grooves and the lamp case or body or door with
projections to enter such grooves.
Fig 5 is an elevation and Fig 6 a plan or top view of a metal chimney with one
attached reflecting chamber and Fig 7 is a tranverse section in line A. B Fig 5.
Figs 8, 9 and 10 are similar views to Figs 5, 6 and 7 of a chimney with two
attached reflecting chambers. In each case the chimney and the connected
reflecting chamber or chambers are formed in two portions 1 and 2 by stamping.
out two pieces of metal so that each portion constitutes or comprises one half or
thereabout of the chimney c and of the wall or walls of the reflecting chamber or
chambers the two portions being afterwards secured together by rivets 3 as shown
or by brazing, the joints being as already stated either lap joints as shown or butt
joints, and running lengthwise of the chimney. After the two portions have been
united the inner surface or surfaces of the wall or walls of the chamber or chambers
as also sometimes part of the inner surface of the chimney is or are rendered
reflective as herein before set forth.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare: that what
I claim is
1. In a lamp having a chimney and a concave reflector or reflectors combined (or
united) as set forth above, arranging such combined chimney and reflector or
reflectors to be capable of withdrawal from their 'containing case by a sliding"

page_text: movement substantially in the manner described with reference to Fig 1 of the
drawings.
2. In a lamp of the kind referred to above arranging the combined chimney
and reflector or reflectors upon the door of the lamp casing so as to be carried
or supported thereby and to be capable of removal therefrom by a sliding move-
ment substantially in the manner described with reference to Figs 3 and 4 of the
drawings.
3. Adapting the door of the casing that contains or encloses the lamp proper
when in position for use, to serve as supporter or carrier of the lamp proper, oil
tank or reservoir, the arrangement being such that when the said door is opened
the lamp proper oil tank or reservoir is withdrawn from its said casing sub-
stantially as hereinabove described with reference to Figs 3 and 4 of the drawings.
4. Securing or locking the lamp proper, oil tank or reservoir in position for use
by means of the burner cone or lamp chimney substantially in the manner
described with reference to Fig 1 and to Figs 3 and 4 of the drawings.
5. Making the combined chimney and reflector or reflectors in the peculiar
manner explained above, that is to say, by stamping or pressing two pieces of
metal each to a form corresponding to one half or thereabout of the combined
chimney and reflector or reflectors and joining these two stampings or portions as
bereinabove described.
6. In a lamp the combination of parts_constructed arranged and operating as
shewn in and described with reference to Fig 1. of the drawings.
7. In a lamp the combination of parts constructed arranged and operating as
shewn in and described with reference to Figs 3 and 4 of the drawings.
Dated this 23rd day of January 1885
T. C. J. THOMAS.
W. Lloyd Wise,
46, Lincoln's Inn Fields,
Applicant's Agent.