Improvements in Galvanometers and the like.
Year: 1899

page_text: Date of Application, 20th Feb., 1899-Accepted, 8th Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Galvanometers and the like.
LANCELOT HALL NEWTON, Electrician, 6, Leadenhall Buildings, Leadenhall
Street, London, E.C., ROBERT RUTSON FOWLER NEVILLE, Wireman, 18, Hayes
Place, Lisson Grove, London, W., SYDNEY PERCIVAL NEWTON, Electrical and
Mechanical Engineer, 31, King Street, Portman Square, London, W., EDWARD
TEW, 3, Northumberland Street, London, W., 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:
Referring to drawings herewith:-
"A" is a permanently magnetized needle sensitively balanced on a vertical
metal point of the requisite length enclosed in a suitable circular metal case and
protected by a glass cover.
"B" is a horizontal piece of highly magnetized steel (a fixture) and well within
the field of "A" thereby controlling "A" and consequently counteracting the
earths magnetic influence.
"C" is a bobbin or frame of ebonite, wood, or other insulating material
enveloping "B."
"D" is an insulated wire of low resistance given the requisite number of turns
round "C."
"E" is a brass terminal fixed in the same plane but separate from "A" and to
which is connected one end of "D."
"F" is a dry cell, one of the terminals of which is fixed to the remaining end of
"D."
"G" is a brass terminal fixed in the same plane but separate from "A" and on
the opposite side of "E."
"H" is an insulated wire fixed to and connecting the remaining terminal or
pole of "F" to terminal "G."
"I" is a case manufactured from wood, ebonite or other suitable insulating
material in which the aforementioned is enclosed.
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The effect of connecting "E" to "G" by means of any electricity conductor, is
that the current flowing through "D creates a magnetic field having a north
and south pole at right angles to and about four times the strength of "B." The
magnetic influence of "B" over A" which is extremely sensitively balanced
now being entirely overcome, A " deflects rapidly owing to the impetus given it
in having to take up a fresh position in the stronger and newly created magnetic
field.
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Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be perforined, we declare that what we
claim is:-
1. An apparatus for testing conductors of electric current to prove that con-
tinuity exists or otherwise

page_text: The novelties claimed are as regards the points of difference in the construction
of the afore-specified invention as compared with that of the existing form of
Galvanometer" and the like, as follows:-
-
In our apparatus the indicator needle is balanced horizontally on a vertical
metal point and is retained in its normal position by means of a permanently
magnetized bar of steel or other suitable material.
In the galvanometer and the like the indicator needle is perpendicular and is
retained in its normal position by means of a balance weight and the like.
In our apparatus one coil only is used which is placed in a horizontal position.
In the galvanometer and the like two coils are used which are placed in a per-
pendicular position.
Dated this 20th day of February 1899
LANCELOT HALL NEWTON.
ROBERT RUTSON FOWLER NEVILLE.
SYDNEY PERCIVAL NEWTON.
EDWARD TEW.