An Incandescent Electric Lamp Gauge.
Year: 1894

page_text: Date of Application, 28th Dec., 1894
Complete Specification Left, 30th Sept., 1895-Accepted, 23rd Nov., 1895
PROVISIONAL SPECIFICATION.
An Incandescent Electric Lamp Gauge.
We, ROBERT DUNBAR RADCLIFFE, Electrical Engineer, of No. 40, Langham
Street, London, West, and CHARLES LEWIS PHILIPS, Solicitor, of No. 5, Phill-
more Terrace, Kensington, London, W. do hereby declare the nature of this
invention to be as follows.
An instrument (attachable on any premises) by means of which a consumer can
instantly learn the condition of any (or all) his incandescent lamps, and ascertain
the exact amount of electricity consumed by each, and the number of units that
will be recorded by his meter while the lamps are in use.
Its construction is substantially as follows:-On a suitable back or frame (a
few inches across), 18 arranged a socket for a single lamp, a galvanometer;
and a push-button, for closing the circuit through the lamp and the helix
of the galvanometer at the same time. The dial and needle of the galvanometer
are so arranged as to indicate the number (and decimals) of watts, or units of
current passing through the lamp when lighted, during any fixed time-sny 1 hom.
Dated this 28th day of December 1894.
ROBERT DUNBAR RADCLIFFE.
CHARLES LEWIS PHILIPS.
Аяциозни пробито нашр стано
We, ROBERT DUNBAR RADCLIFFE, Electrical Engineer, of No. 40 Langham
Street, London, West, and CHARLES LEWIS PHILIPS, Solicitor, of No 5 Philli-
more Terrace, Kensington, London, W., 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 —
Our invention relates to a gauge o instrument by means of which a user can
at any time readily lean the condition of any or of all of his incandescent
Jainps, and ascertain the exact amount of electrical power consumed by cach and
the number of units of power that will be recorded by his meter while the lamps
ale in use.
The said instrument or gauge compuses a base on which 18 arranged a socket
for an
Incandescent electric lamp, a push or switch, and a mcasuring
galvanometer.
In order that our invention may be clearly understood we will now describe
the same with reference to the accompanying diawing in which,
Figure 1 is a fi ont elevation of au incandescent lamp gauge constructed according
to our invention, and
Figure 2 is a side elevation of the same.
A is the base of the instrument; B is an incandescent electric lamp socket;
C is a measuring galvanometer; D is a push button or switch by means of which
the circuit through the parts of the instrument can be completed. E is a socket

page_text: for the receipt of a double circuit contact plug F
To the said plug is connected
one end of a long length of double flexible wire G the other end of which 18
connected to a lamp contact plug H which is adapted to fit into any ordinary
incandescent lamp socket. J 18 a hook on which the flexible wire G and its
attached plug II are hung up when not in use
The different parts of the instrument are connected in series with one another
or they may be arranged in any other suitable manner which will enable the
olectric current to pass through them when the circuit is completed by the switch
or push button.
When it is desired to test a lamp, the said lamp is removed from its own sochet
in the lamp bracket or the like and is then fitted into the socket B provided iu
the gauge, as indicated by dotted lines in Figuro 2, and the plug B, which is
preferably a counterpart of the contact plug of the lamp, is inserted into the lamp
socket from which the lamp to be tested bas been removed
By this means it will be seen that the lamp when attached to the gauge is
working under conditions as to voltage and current exactly similar to those under
which it worked before being removed from its own socket provided that the flexible
wines G are made of such cross section as not to offer any appreciable resistance
to the passage of the current through them.
Morcover by the employment of the contact plug II a convenient method of
connecting the gauge to the mains is provided.
On operating the push or switch D the current is switched on and passes from
the one main conductor through the plug H, and the flexible wire G to the plug F
thence through the galvanometer C, the lamp K and the push or switch D and
back again to the other main conductor from which the lamp under test has been
taken,
The galvanometer may be arranged to indicate the number of watts or units of
electrical power passing through the lamp when lighted, duing any fixed time, or
it may be calibrated in any other convenient or suitable manner.
The lamp gauge may be made in a portable form or it may be arranged as
shown in the drawing in a form intended to be secured to or hung on the wall of
a room.
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 :-
1. The combination, in a single instrument, of an incandescent lamp holder, a
circuit closing device, and a measuring galvanometer, substantially as, and for the
purpose, specified.
2. The combination with the apparatus referred to in the preceding claim of
the plug F, connecting wie G, and the plug II, substantially as and for the purpose,
specified.
3. An incandescent lamp gaugo constructed substantially as described with
reference to the drawing and operating in the manner specified.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.