Improvements in the Construction of Electrical Measuring Instruments.
Year: 1893

page_text: Date of Application, 24th Feb., 1893
Complete Specification Left, 13th Nov., 1893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Electrical Measuring
Instruments.
HENRY CAPEL LOFFT HOLDEN Major, Royal Artillery Royal Arsenal
Woolwich London, S.E. do hereby declare the nature of this invention to be as
follows:-
My invention consists of a method and means of fixing the moving coil of
those electrical instruments, in which a moving coil suspended from either one or
both of its ends is employed, so as to make the entire instrument or any portion
of it portable; this portability being obtained without the necessity for releasing
the tension of the suspension or suspensions.
In my invention there is a clamping arrangement which is pivotted and turns
about the same axis as the coil itself, and which furthermore is so arranged that,
when the instrument is in use for measuring purposes, it can be turned on its pivots
and thereby placed in such a position as not to interfere in any way with the
movement of the coil.
When it is desired to fix the moving coil, which may be done without disturbing
any of its adjustments, the clamp is turned about its axis till it forces one side of
the coil against a fixed projection, which fixed projection may either be on
the core, if there be one, or a part of it, or form a separate part of the
instrument, in such a manner that the coil is fastened securely between the
clamp and the projection along the whole or only a part of its length on the one
side, whilst the other side of the coil is at the same time fixed between two
projecting pins or equivalent device at the two ends of the clamp and a fixed
projection which may either be on the core if there be one, or a separate part of.
the instrument.
Dated this 23rd day of February 1893
>
H. C. L. HOLDEN,
Major, R.A.
COMPLETE SPECIFICATION.
Improvements in the Construction of Electrical Measuring
Instruments.
HENRY CAPEL LOFFT HOLDEN Major, Royal Artillery Royal Arsenal
Woolwich, London S.E. do hereby declare the nature of this. invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
My invention consists of a method and means of fixing the moving coil of those
electrical instruments, in which a moving coil suspended from either or both of
its ends is employed, so as to make the entire instrument or any portion of it
portable, this portability being obtained without the necessity for releasing the
tension of the suspension or suspensions.
In my invention there is a clamping arrangement which is pirotted and turns
about the same axis as the coil itself, and which furthermore is so arranged that
when the instrument is in use for measuring purposes it can be turned on its pivots
and thereby placed in such a position as not to interfere in any way with the
movement of the coil.
When it is desired to fix the moving coil, which may be done without disturbing
any of its adjustments, the clamp is turned about its axis until it forces one side of
.n

page_text: the coil against a fixed projection, which may be either on the core, if there be one
or form a separate part of the instrument, in such a manner that the coil is fastened
securely between the clamp along the whole or only a part of its length on the
one side, whilst the other side of the coil is at the same time fixed between two
projecting pins or equivalent device at the two ends of the clamp and a fixed
projection or projections which may either be on the core, there be one or a
separate part of the instrument.
Referring to the accompanying drawings for the purpose of more clearly
explaining my invention and the manner in which it may be carried into effect.
Fig. 1 is an elevation and plan showing the clamping device applied to a moving
coil with a fixed core of iron or other metal, and the clamp is herein shown in the
position in which the coil is free to move.
Fig. 2 is in like manner an elevation and plan of the same coil and core but in
this case the coil is fixed by the clamp.
In both figures the same letters are used to indicate similar portions of the
device.
S is the suspension by which the moving coil C is suspended in position so as to
be free to move, when not clamped around the core I; K denotes the clamp
pivotted at either end of the core I and capable of being fixed with respect to
the core in its various positions by the screw N. P. P. P. denote metal or other
pins projecting from the core I and the clamp K, and against which whether there
be one or more the coil is pressed when secured by the action of the clamp. The
operation of clamping the coil is performed firstly, by releasing the screw N which
fixes the clamp in position shown in Fig. 1. and secondly by turning it around the
core as shown in Fig. 2. until it fixes one side of the moving coil against the core
support V and the other between the pins P projecting from the core and
clamp respectively, the screw N is then tightened to hold the two parts firmly and
securely.
The moving of the clamp can be effected by suitable devices either with or without
removing the cover of the instrument.
Having now particularly ascertained and described the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is;
A method and means of securely fixing the moving coil in those electrical
instruments in which a moving coil suspended from either or both of its ends is
employed, so as to make the entire instrument or any portion of it portable, this
portability being obtained without the necessity for releasing the tension of the
suspension or suspensions of the aforesaid moving coil.
Dated this Eighth day of November 1893...
H. C. L. HOLDEN,
Major, R.A.