Improvements in or connected with Medical Coils.
Year: 1893

page_text: Date of Application, 1st Aug.. 1893
Complete Specification Left, 1st May, 1894-Accepted, 9th June, 1894
.
PROVISIONAL SPECIFICATION.
Improvements in or connected with Medical Coils.
I, HOWARD BLAIN LITTLE, of 20 Eldon Road, Kensington, in the County
of Middlesex, Electrician, do hereby declare the nature of this invention to be as
follows:-
My invention relates to medical coils aud has for its objects to economise space
and battery power and to produce an efficient, portable and cheap apparatus.
To these ends in the first place I construct the electro-magnet in two parts. One
limb is straight and wound with a coil of insulated wire. The other limb and the
yoke of the magnet are in one solid piece of iron formed like an L. When put
together the shorter limb of the L shaped piece fits upon one end of the said
straight and wound limb and is secured thereto. Thus a shaped double poled
magnet is formed wound on one limb only and to this is fitted any ordinary form
of vibrating make and break contact. The apparatus is provided with suitably
connected electrodes to be gripped by or applied to any person to whom it is desired
to administer an electric current.
Secondly to economise battery power I connect in series with the cell or battery
and the electromagnet coil (instead of with the patient as hitherto the practice) a
regulating device consisting of a wire of suitably high resistance stretched in a
serpentine fashion to and fro over a number of contacts conveniently arranged on
one end of the box. Over these contacts works a switch electrically connected
in the ordinary manner and adapted to vary the resistance when passed over the
contacts. The whole of the devices above described are mounted in a box or case
with any suitable type of cell or battery and the electrical connections are
arranged in the known manner.
J. G. LORRAIN, Mem. Inst. E.E., Mem. Inst. M.E.,
Norfolk House, Norfolk Street, London, W.C.,
Chartered Patent Agent,
Per A. P. W.
COMPLETE SPECIFICATION.
Improvements in or connected with Medical Coils.
I, HOWARD BLAIN LITTLE, of 20 Eldon Road, Kensington, in the County of
Middlesex, Electrician, 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 invention relates to medical coils and has for its objects to economise space
and battery power and to produce an efficient, portable and cheap apparatus.
In order that my invention may be easily understood I shall proceed to describe
it with reference to the accompanying drawing.
I construct the electro-magnet in two parts. One part consists of a straight
limb B which serves as a core for the winding C. The other part consists of
the L-shaped piece of iron D, one part of which d serves as a free limb and the
other part d' as a yoke. When put together the shorter arm of the L-shaped piece
is fixed to one end of the wound limb B. A U-shaped double poled magnet is thus

page_text: formed wound on one limb only. Opposite the poles of the electro-magnet thus
constituted I place a vibrating make and break device consisting in this case of
armature E, spring F, and contact terminal and screw G. H and J are terminals
to which are attached the electrodes K, K' by means of the cords L, L'.
For the purpose of regulating the current to be applied to the patient I connect
in series with the battery A and magnet (instead of in series with the patient as
heretofore) a regulating device consisting of the resistance wire M stretched over
the contact studs N and stretching studs O. Over these contact studs sweeps the
contact lever P connected in the ordinary manner and adapted to vary the resistance
in the usual way when passed over the contact studs.
The whole of the devices before mentioned are mounted in a box or case, and
any convenient form of battery, preferably a dry cell, may be employed.
In practice I prefer to make the L-shaped piece of iron D of the same sectional
area as the wound limb B.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. In a medical coil the new or improved construction of electro-magnet
substantially as set forth.
2. The arrangement and combination of parts constituting the new or improved
medical coil substantially as set forth.
Dated this 30th day of April 1894.
For the Applicant,
J. G. LORRAIN, M. Inst. E.E., M. Inst. M.E.,
Norfolk House, Norfolk Street, Strand, London, W.C.,
Chartered Patent Agent.