IMPROVEMENTS IN INDUCTION COILS AND CONTACT BREAKERS THEREFOR
Year: 1884

page_text: COMPLETE SPECIFICATION.
1, JOHN BEVERIDGE THISTLETON, of 1, Old Quebec Street, Oxford Street,
London, in the County of Middlesex, Electrician, do hereby declare the nature of
my invention for "IMPROVEMENTS IN INDUCTION COILS AND CONTACT BREAKERS
THEREFOR," and in what manner the same is to be performed, to be particularly.
described and ascertained in and by the following statement :-
The invention consists of two principal parts, which may be called, the Coil, and
the Current Interrupter, The Coil consists of a bobbin of wood, metal ebonite
or other similar material, on which is wound a helix, or helices of copper, iron,
german silver or other wire. In the centre of the coil is inserted, a rod, tube, or
bundle of iron: The wire used is not insulated with gutta-percha, cotton or silk,
as is usually the case, but is used un-covered and is insulated by being imbedded
in paraffin or other similar material, during or after the process of winding the
wire upon the coil. The interrupter consists of two metal arms both of which are
attached to one end of the coil; thus rendering the current interrupter entirely
independent of the surrounding woodwork, one of these arms carries a metal
spring, the other arm carries a stud faced with platinum and a sprung washer, the
position of this stud with regard to the vibrating spring may be varied by means
of a slot in the brass arm, or an eccentric movement of the stud, thus allowing the
rapidity of the interruptions of the current to be greatly varied, or the platinum
faced stud to be entirely drawn out of contact with the vibrating spring, and so
preventing waste of the battery when the apparatus is not in use. The length of
the slot in the aforesaid arm, or the amount of movement of the eccentric,
determines the possible variations of the rapidity of the interruptions of the
current.
In order to enable my invention to be fully understood I will proceed to
describe the same by reference to the accompanying drawing. Figs. 1 and 2 are
back elevations, and Fig. 3, plan, showing the current interrupter attached to one
end of the coil, and two different positions of the stud a. When a. is in the
position shown in Fig. 1, the platinum, with which a. is furnished does not touch
the spring b., which is attached to the bent arın g., and the circuit between the
battery and the current interrupter is not completed, but when a. is moved in the
slot c. until in the position shown in Figs. 2 and 3, the circuit is completed and the
Price T

page_text: interruptions are exceedingly rapid. By varying the position of a. in the blot c.
between the two probable extremes shown in Fig. 1 and Figs. 2 and 3, the
rapidity of the interruptions may be greatly varied. In Figs. 4, 5 and 6 and a,
Fig. 9, are shown other modes of obtaining a similar result, by means of a semi-
circular slot or eccentric motions, or a spring fitting or other similar contrivance by
means of which a. may be pushed into, or drawn out of, contact with b. Fig. 9 is
a plan of the complete apparatus, h, being the coil, i. i. i. i., the terminals for same,
and k. k., the battery, d. d. d. d., being the positive and negative plates. In each
of the Figs. similar letters refer to the same parts.
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 :-
(1) The construction of an electro-magnetic, induction or other helix of wire for
electrical purposes in which bare wire is used and insulated by means of ozokerit,
paraffin, or other similar substance as herein before described.
(2) The construction of a Current Interrupter the whole of which is attached to
the end of the coil, and which will permit the circuit between the battery and
the coil to be entirely broken, or the number of interruptions of the current in a
given time to be greatly varied, substantially as and for the purposes hereinbefore
described and represented in Figs. 1, 2, 3, 4, 5, 6 and 9, of the accompanying
drawing.
Dated this 1st Any of Fahmiome 1001.