Improvements in Appliances for Protecting Electrical Measuring Instruments from External Influences.
Year: 1896

page_text: Date of Application, 12th Sept., 1896.
Complete Specification Left, 2nd June, 1897-Accepted, 3rd July, 1897.
Engineers.]
Improvements in Appliances for Protecting Electrical Measuring
Instruments from External Influences.
We, SIEMENS BROTHERS & Co. LIMITED of 12 Queen Anne's Gate, Westminster,
Electrical Engineers, do hereby declare the nature of this invention to be as
follows:-
This invention relates to means of protecting electrical measuring instruments from
external electric or magnetic influences. For this purpose, on each side of one of the
astatically arranged magnets of the instrument are placed bundles of iron wires, or
massive iron cores, which have the effect of gathering the variously directed external
lines of force into a single direction in which they are sent through the instrument
thus neutralizing their deranging influence.
The wire bundles or cores may be made straight or in various forms, such for
instance as that of an with the short limb of each directed towards the magnet of
the instrument, or of a T with the middle limb so directed, the middle limb in this
case being surrounded by a ring having radiating bundles or cores arranged star
fashion beyond it.
The said appliance is made adjustable to or from the magnet by means of a screw
or other suitable device.
Dated this 12th day of September 1896.
ABEL & IMRAY,
Agents for the Applicants.
Improvements in Appliances for Protecting Electrical Measuring
Instruments from External Influences.
We, SIEMENS BROTHERS & Co. LIMITED, of 12 Queen Anne's Gate, Westminster,
Electrical Engineers, 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 :-
This invention relates to means of protecting electrical measuring instruments
from external electric or magnetic influences.
For this purpose, on each side of one of the astatically arranged magnets of the
instrument are placed bundles of iron wires, or massive iron cores, which have the
effect of gathering the variously directed external lines of force into a single direction
[Price 8d1

page_text: in which they are sent through the instrument thus neutralizing their deranging
influence.
The wire bundles or cores may be made straight or in various forms, such for
instance as that of an L with the short limb of each directed towards the magnet of
the instrument, or of a T with the middle limb so directed, the middle limb in this
case being surrounded by a ring having radiating bundles or cores arranged star fashion
beyond it.
The said appliance is made adjustable to or from the magnet by means of a screw
or other suitable device.
Various forms and arrangements of protecting appliances are shewn in the
drawings.
They may be elbow shaped as shown by B, in Figures 1 and 3 or straight as B, in
Figure 2 and star shaped as B, in Figures 2 and 4, and may have set screws such as R,
Figure 3 for adjusting their distance from the instrument.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, We declare that what we claim
is :-
For protecting electrical measuring instruments from external influences, an
appliance consisting of bundles of iron wire or massive iron cores set on each side of
one of the astatically arranged magnets of the instrument substantially as described.
Dated this 2nd day of June 1897.
ABEL & IMRAY,
Agents for the Applicants.