Improvements applicable to Electric Meters.
Year: 1896

page_text: Date of Application, 1st Feb., 1896
2000
2000
Improvements applicable to Electric Meters.
1, WILLIAM MC WHIRTER, of 8, Osborne Place, Govan, in the County of
Lanark, North Britain, Electrical Engineer, do hereby declare the nature of this
invention to be as follows, that is to say :-
My said invention is applicable to any electric meter in which a coil or solenoid
of wound wire is employed for the passage of the electric current in a manner to
act on the iudicating parts of the meter. The meter may be of the kind described
in my Patent Specification No. 3533 of 1883, or of any of the many more or less
different kinds introduced or proposed during recent years.
Hitherto coils of the kind herein before referred to, and as used in meters, have
been wound upon brass bobbins consisting of barrels with brass end disks or
flanges; but by my invention each-bobbin is made to consist of a brass barrel on
which are fixed end disks or flanges of soft iron, and in addition the coil is
enclosed in an external shell or casing of soft iron. The application of soft iron
in this way has several advantages. It increases the magnetic field, in a manner
to allow of the meter being actuated by comparatively small power. It screens
the coil from the action of external magnetic fields, such as exist in the neighbour-
hood of dynamos. And it allows of the meter being placed near iron or steel in
ships or in other structures without being magnetically influenced thereby.
Dated this Thirty-first day of January 1896.
EDMUND HUNT,
Applicant's Agent.
Improvements applicable to Electric Meters.
I, WILLIAM MC WAIRTER of 8 Osborne Place, Govan in the County of
Lanark, North Britain, Electrical Engineer, 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:-
My said invention is applicable to any electric meter in which a coil or solenoid
of wound wire is employed for the passage of the electric current in a manner to
act on the indicating parts of the meter. The meter may be of the kind described
in my Patent Specification No. 3533 of 1883 or of any of the many more or less
different kinds introduced or proposed during recent years.
Hitherto coils of the kind hereinbefore referred to and as used in meters have
been wound upon brass bobbins consisting of barrels, with brass end discs or
flanges; but by my invention of which Fig. 1 is a plan and Fig. 2 a section each
bobbin is made to consist of a brass barrel, b., on which are fixed end discs or
flanges of soft iron, a, and in addition the coil is enclosed in an external shell
or casing of soft iron d. The casing d may be simply a piece of sheet iron
Price 8d.1

page_text: bent around the coil, the ends approaching together at e, the casing being held
in position on the flanges by its own elasticity, or it may be made in a complete
cylinder or tube fitting over the coil and secured to the flanges in any of the well
known ways. c is the interior of the bobbin where the meter movement would be
placed.
The application of soft iron in this way bas several advantages. It increases
the magnetic field at c in a manner to allow of the meter being actuated by
comparatively small power. It screens the movement from the action of external
magnetic fields, such as exist in the neighbourhood of dynamos, and it allows of
the meter being placed near iron or steel in ships or other structures or in
proximity to dynamos and switchboards without being magnetically influenced
thereby.
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 :-
The improved bobbin constructed with soft iron flanges, the bobbin being in
whole or in part surrounded by a shield or casing of soft iron substantially as and
for the purposes herein set forth.
Dated this the 201
3000
W. McWHIRTER,
Applicant.