SPRING COMPENSATORS FOR SIGNAL AND TELEGRAPH WIRES
Year: 1884

page_text: I, JOHN DONNELLY HALL, of 3 Victoria Terrace, Newburn, in the county of
Northumberland, Engineer do hereby declare the nature of my invention for
"SPRING COMPENSATORS FOR SIGNAL AND TELEGRAPH WIRES," to be as follows:→
I apply to Signal and Telegraph wires; springs, so arranged, that the lengthening,
or shortening of the Signal or Telegraph wires by increase or decrease of temperature,
is neutralized by the extension or compression of the springs; thus keeping the
Signal or Telegraph wires, at one uniform tension. The elasticity of the springs
also counteracting any shock or straining action in the Signal or Telegraph wires,
produced by the wind or other causes.
In the application of my Invention to Signal wires, I use "slip catches," so
constructed, and arranged, that by a sudden pull on the signal wire, the springs may
be thrown out of action if desired.
71
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1004

page_text: "
I, JOHN DONNELLY HALL of 3 Victoria Terrace, Newburn, in the county of
Northumberland, Engineer, do hereby declare the nature of my invention for
"SPRING COMPENSATORS FOR SIGNAL AND TELEGRAPH WIRES and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
I apply to Signal and Telegraph wires, Springs so arranged that the lengthening,
or shortening of the Signal or Telegraph wires, by increase or decrease of
temperature, is neutralized by the extension or compression of the springs, thus
keeping the Signal or Telegraph wires, at one uniform tension; the elasticity of
the springs also counteracting any shock or straining action in the Signal or
Telegraph wires, produced by the wind or other causes.
In the application of my Invention to Signal wires, I use "slip catches," so
constructed, and arranged, that by a sudden pull on the signal wire the springs
_may be thrown out of action if desired.
Having now explained the nature of my Invention of "Spring Compensators for
Signal and Telegraph Wires" I will now proceed to particularly describe in what
manner the same is to be carried into effect by the aid of the following Drawings.
Fig 1 shows a sectional elevation Fig: 2 a sectional plan and Fig: 3 an end
elevation of the spring as applied to signal wires. The spring being attached by its
extremities A and B. to any convenient part of a signal wire with a suitable
amount of initial compression, tends by its elasticity to keep the signal wire at an
approximately uniform tension throughout, and neutralizes any lengthening or
shortening of the signal wire due to increase or decrease of temperature.
C. D. E F is a "slip catch," part of which C. D. is loose on the central rod A. B.
and free to turn partially round on its longitudinal axis C. D. its two extremities C
and D are forked so as to partially encircle the longitudinal rods G and H. The
forked extremities of C. D, are so arranged that when C. D. is partially rotated on
its longitudinal axis, the longitudinal rods G and H are firmly gripped, and the
spring thrown out of action.
In order that the spring may be thrown out of action it is only necessary to pull
the end B, suddenly in the direction of the arrow, when C. D. will be partially
rotated on its longitudinal axis by the point F, and the extremities of C. D. will
firmly grip the longitudinal rods G and H and the spring be thrown out of action
as desired.
Fig 4 shows an elevation and Fig 5 a plan of the spring as applied to telegraph
wires. The ends of the spring I K. are attached to lengths of telegraph wires at
suitable distances. The elasticity of the springs keeping the telegraph wire at an
approximately uniform tension and neutralizing any shock or straining action
induced in the telegraph wire by changes of temperature, wind or other causes.
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
1st The application of springs of any desired form, number, or cross section to
Signal wires, in order to neutralize by their elasticity, any lengthening or shortening
of the Signal wires due to increase or decrease of temperature.

page_text: 2nd The application of "Slip Catches" in conjunction with the springs as herein
described, in order that the springs may be thrown out of action if desired.
3rd The application of springs of any desired number, form or cross section, to
telegraph wires in order to neutralize by their elasticity, any lengthening or
shortening of the wire, due to increase or decrease of temperature, and to counteract
any shock or straining action induced in the telegraph wire by the action of the
wind or other causes.