Improvements in and relating to Incandescent Electric Lamps.
Year: 1890

page_text: Date of Application, 8th Oct., 1890
Complete Specification Left, 3rd July, 1891-Accepted, 8th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to Incandescent Electric Lamps.
We, ROBERT DICK, Manufacturer, and JAMES DUNCAN MACLEAN, Electrician,
both of the Woodside Electric Company, Kelvinbridge, Glasgow, Lanarkshire, do
hereby declare the nature of our invention to be as follows:-
This invention has reference to improvements in incandescent electric lamps,
and has for its object to prevent the deposit of the volatilised carbon from the
incandescent filaments or conductors which at present takes place on the inner
surface of the glass globes of these lamps and obscure them, to the loss of much
light, and enable them to keep clean during the lifetime of the carbons.
The improvements consist in the arrangement and use of a conductor or collector
which has more affinity for the volatilized carbon than the glass or surface of the
globe, preferably soft iron or other suitable metal, or carbon placed sufficiently
near the filament or light conductor that it will receive and collect on its surface
all or nearly all the volatilised carbon particles liberated or given off from the
incandescent filament. One preferable construction of this volatilised carbon
collector consists in making it in the form of an endless loop wire, preferably of
soft iron within and nearly parallel with the incandescent filament or light con-
ductor, and preferably of about double the sectional area of the latter and
about th of an inch from the carbon, and preferably nearest the carbon at their
adjacent loop or strongest parts, and with its other loop part connected by a wire
to the iron stem or platinum conductor of the lamp, which may either be the
negative or positive stem, or instead of a wire a broad thin plate may be used,
either with or without the central part cut out.
In some cases two collecting wires may be so used for receiving the electro
magnetic deposit of carbon, one attached to each iron stem or both to one stem, and
led down parallel on the inside or outside of the carbons preferably the former
not to obstruct the light, but this does not do so well as the endless loop. A forked or
other guard wire of mica, asbestos, or other non-conducting substance would
preferably project from the loop of the new carbon collectors on each side of the
filament or light conductor to steady or prevent the vibration of same.
בד
1000
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPecification.
Improvements in and relating to Incandescent Electric Lamps..
We, ROBERT DICK, Manufacturer, and JAMES DUNCAN MACLEAN, Electrician,
both of the Woodside Electric Company, Kelvinbridge, Glasgow, Lanarkshire, do
hereby declare the nature of our invention, and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement in writing, that is to say :-
This invention has reference to improvements in incandescent electric lamps,
and has for its object to prevent the deposit of the volatilised carbon from the
incandescent filaments or conductors which at present takes place on the inner
surface of the glass globes of these lamps and obscures them, to the loss of much
light, and enables them to keep clean during the life-time of the carbons.
Ii

page_text: The improvements consist in the arrangement and use of a conductor or collector
which has more affinity for the volatilised carbon than the glass or surface of the
globe, preferably soft iron or other suitable metal, carbon, or material placed
sufficiently near the filament or incandescent carbon that it will receive and collect
on its surface all or nearly all the volatilised carbon particles liberated or given off
from the incandescent filament.
And in order that our said invention, and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended an explanatory sheet of drawings representing eight clevations of
incandescent lamps as fitted with different arrangements of our new carbon
collectors. In these drawings the same reference letters indicate equivalent parts
in all the figures where shown.
Referring to these drawings:-This volatilised carbon collector would under one
arrangement shown in Figures 1 and 2 be made in the form of an endless loop
wire a preferably of soft iron within and, as shown in Figure 1, nearly parallel
with the incandescent filament or light conductor A within the vacuum glass
globe Zor of a circular shape, as in Figure 2, and preferably about double the
sectional area of the filament A and about of an inch from the carbon A, and
preferably furthest from the carbon A at their adjacent loop or strongest
parts a, A, and with its other loop part connected by a wire a¹ to near the centre
of one of the iron stems B of the platinum conductors of the lamp Z, which may
either be the negative or positive stem; or instead of a wire a a broad thin plate
may be used, either with or without the central part a cut out, or divided as in
Figure 7. Instead of forming the collector a of an endless loop shape as shown
in Figures 1 and 2, it may be formed of a spiral or helical screw shape, as shown
in Figure 3.
In some cases two collecting wires a a may be used for receiving the electrolytic
deposit of carbon, one attached to each platinum conductor B, B', as shown in
Figures 4 and 5 or both to one stem B or B¹, as shown in Figure and led down
parallel on the inside, or it may be the outside, of the carbons but preferably the
former not to obstruct the light, and preferably having their loop parts cut away
at a' so as not to short circuit the current passing through the light conductor A
when joined to the opposite stems B, B'. As shown in Figure 7, the collector a is
shown as formed of a divided four pronged fork shape, secured by one stem all,
and a platinum wire, by an enlargement or glass socket to the glass globe Z.
And in Figure 8 the collector is shown in the form of one rod a but it might be
two or more rods, passing transversely between the limbs of the filament A, and
secured at its ends by platinum wires to enlargements on the glass at . A forked
or other guard b, b, of mica, asbestos, or other non-conducting substance would
preferably project from the loop end a¹ of the new carbon collectors a, as shown in
Figure 1, some distance on each side of the lower part A¹ of the filament or light
conductor A to steady or prevent the over-vibration of same.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First. The construction or general arrangement and combination of the parts
of incandescent lamps with metallic or other conducting collectors to receive the
deposit of carbon volatilized or liberated from the incandescent filament or light,
substantially as and in the manner and for the purposes herein described in reference
to and shown in the accompanying drawings.
Second. The arrangement and use of a metallic or other conducting collector or
collectors within an incandescent or vacuum lamp to collect or receive the deposit
of carbon volatilized or liberated from the incandescent filament or light, substan-
tially as and for the purposes herein described in reference to and by way of
application shown in the accompanying drawings.

page_text: Third. In an incandescent lamp the combination of a carbon collector with a
non-conducting filament vibration guard substantially as and for the purposes
herein described in reference to and by way of application shown in Figure 1 of
the accompanying drawings.
Dated the and Tul- 1901
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.