IMPROVE- MENTS IN LAMPS
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said David Hynd at the Office
of the Commissioners of Patents on the 5th March 1880.
DAVID HYND, of Dundee, in the County of Forfar, North Britain. "IMPROVE-
MENTS IN LAMPS."
The said Invention has for its object to produce a shadowless lamp wherein the
burners are capable of adjustinent relatively with the reflectors.
In a lamp constructed according to the said Invention the suspending tube by
which the lamp is suspended from the ceiling or other place supports a ring for
carrying the reflectors, and has a stuffing box in its end through which slides gas
tightly a tube branching into two or more tubes or supports between which the
ring carrying the jets is carried, and by which the gas is conveyed to the said jets.
The said jets slope inwards at an angle from the said ring, and the reflectors slope
inwards from their ring at a similar angle, the said reflectors consisting of separate
plates, having some interval between each, and fastened in their places on. the
reflector ring by being slidden into guides or clips thereon.
A lamp constructed according to this Invention casts no shadow below, and the
burners may be brought into the exact position relatively with the reflectors to give
the best effect by sliding the tube which carries the burner ring up or down in the
before mentioned stuffing box in the lamp suspending tube, whilst the reflectors
remain stationary.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David Hynd in the Great Seal Patent Office on the 2nd September
1880.
DAVID HYND, of Dundee, in the County of Forfar, North Britain.
MENTS IN LAMPS."
"IMPROVE-
My said Invention has for its object to produce a shadowless lamp, as hereinafter
described, wherein the burners are capable of adjustment relatively with the
reflectors.
And in order that my said Invention may be properly understood, I now proceed
more particularly to set forth the system, mode, or manner, in or under which the
same is or may be used or practically carried into effect, reference being had to the
accompanying Drawings, and to the letters and figures marked thereon, that is to
say,
-
Figure 1 represents in side elevation, Figure 2 in plan, and Figure 3 in vertical
section, a lamp constructed according to my Invention. The suspending tube a by
which the lamp is suspended from the ceiling or other place is fixed to such place
so as to be in communication with the gas supply, and supports a ring 6 for
carrying the reflectors, the said ring being connected by the arms 62 to a ring b³,
embracing the tube a and fixed thereto by a pinching nut, as at 64, or otherwise.
The said tube a has in its end a stuffing box as, through which slides gas-tightly a
tube c branching into two supports c2 by which the tubular ring d carrying the
jets d² is supported. One (or both) of these supports is a tube forming the com-
munication or channel for the gas from the tube c to the ring d, the said gas
passing to the jets d² from the said ring d, the passage of the said gas being
regulated by the cock d³. The said jets d² slope inwards at an angle from the said
ring d. The ring b carries a series of rods or supports e provided with holders or
clipse in which the reflectorse are held. The said reflectors consist of separate
plates, and there are intervals or spaces between each such plates as shewn. They
slope inwards at an angle corresponding preferably with that of the jets d². The
said jets may be situated one immediately beneath the centre line of each reflector,
or of every alternate reflector, or they may be arranged in other order with regard
to the said reflectors. A smoke interceptor f is hung upon the hook g, carried by
the tube c.
There may be one only, or more than two supports c², and the burner
tube & may be a complete ring, or in one or more portions of a ring.
A lamp constructed according to my Invention casts no shadow below, as there
are no parts of the lamp between the burners and the object or place to be
illuminated. It also casts very little shadow above. The spaces between the
reflectors prevent the casting of a heavy shadow above, and also by allowing of the
passage of air between the said reflectors, prevent the concentration of heat which
would take place with one continuous reflector for all the burners. The burners
d may be brought into the exact position relatively with the reflectors e to give
the best effect by sliding the tube ĉ up or down in the stuffing box a², whilst the
reflectors remain stationary.
Having now described and particularly ascertained the nature of my said
Invention, and the system, mode, or manner in or under which the same is or may
be used or practically carried into effect, I would observe in conclusion that I do
not limit myself to the precise details herein described and illustrated, as the same
may be varied without departing from the nature of my Invention, but what I
consider to be novel and original, and therefore claim as the Invention secured to
me by the hereinbefore in part recited Letters Patent is,―
The arrangement and combination of parts constituting the herein before
described improved lamp, the essential features of which are the reflectors formed
of separate plates supported from above over the jets or burners, and having a

page_text: space between them, and the adjustability of the burners to a greater or less
distance from the reflectors, all essentially as and for the purposes hereinbefore
described with reference to the accompanying Drawings.
In witness whereof, I, the said David Hynd, have hereunto set my hand
and seal, this Fourteenth day of August, in the year of our Lord One
thousand eight hundred and eighty.
DAVID HYND. (L.S.)