A.D. 1897No 25,816
A.D. 1897
Date of Application, 8th Nov. 1897
Complete
Specification Left, 25th July, 1898--Accepted, 3rd Sept., 1898
PROVISIONAL
SPECIFICATION.
Improvements
in Insulators.
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We,
DANIEL SINCLAIR,
Engineer-in-Chief to The National Telephone Company Limited, and WILLIAM
AITKEN, Engineer, both of Oxford Court, Cannon
Street, in the City of London, do hereby declare the nature of this
invention to be as follows:--- Our invention relates to improvements in insulators and more particularly relates to insulators for supporting telephone, telegraph, and electric-light wires. With
insulators according to the well-known patterns, when it is necessary to
branch off from the main wire with a covered wire, either for
cross-connecting or leading in to a test-box, terminal station or
office, a large amount of surface leakage takes place in wet or damp
weather, through the moisture on the surface of the insulated wire and
over the surface of the pole or test-box, etc., to earth. Insulators
constructed according to our invention prevent this leakage by
efficiently protecting a length of the insulated wire from contact with
the atmosphere or otherwise well protecting it from the weather, and
are, therefore, specially adapted for connecting branch or leading-off
wires to the main wires without lowering their insulation. To
attain this end, we construct our insulator of earthenware, glass,
enamelled iron, or other suitable material, preferably in two parts that
forming the inner shed having a female thread cut centrally in the
inside of the upper portion to receive the bolt, and a male thread cut
on the outer upper portion, with a groove of sufficient
size cut at right angles to the line of the thread, and passing
diametrically over the top to receive the covered wire. The second
portion forming the outer shed may be externally of any of the
well-known patterns, with a female thread cut on the inner upper portion
of such a size that Will fit tightly over the thread on the inner shed
before-mentioned; or, when cheapness of construction is a desideratum;
the inner shed with its attendant groove may be dispensed with, and,
instead, a hole pierced in the upper part of the bolt, just below the
collar, to receive the covered conductor, the shed being somewhat longer
and, at the lower edge, somewhat greater in diameter than is common. Dated
this 5th day of November 1897.
DANIEL SINCLAIR WILLIAM AITKEN _____________________________________________________ COMPLETE
SPECIFICATION Improvements
in Insulators. We,
DANIEL SINCLAIR, Engineer-in-Chief
to The National Telephone Company Limited,
Oxford Court, Cannon Street, in the City of London, and WILLIAM
AITKEN, Engineer, with said Company at above address, 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:-- This
invention relates to improvements in insu1ators for supporting telephone,
telegraph, electric light and other wires and has for its object to prevent
the loss of insulation which takes place over the surface of the covered
conductor when using such to branch off from the main line for any purpose
with any of the well known forms of ordinary insulators. Insulators
constructed according to our invention prevent this loss of insulation by
efficiently protecting a portion of the insulated wire from exposure to the
weather and are therefore specially adapted for connecting branch or
"leading off" wires from the main lines without lowering their
insulation. To
attain this end we construct our insulator of earthenware, glass, enamelled
iron or other suitable material, preferably, in two parts reference being made
to Figures 1,2 and 3 1ike letters indicating simi1ar parts, that forming the
inner shed f being constructed as follows:- A female thread is cut centrally
in the inside of the upper portion as shown at h to receive the bolt
y and a
male thread is cut on the outer upper portion of h and a groove a is cut at
right angles to the line of the thread and across the top to receive the
covered conductor b which is jointed at c on the main line
I the latter being
terminated at d in the usual manner, the other end of b being connected to
another wire or to a test or cross connecting box. The
second portion forming the outer shed e may be externally of any of the well
known patterns with a female thread g cut on the inner upper portion to such a
size as to fit tightly over the thread on the inner shed before mentioned or
when cheapness of construction is a desideratum the inner shed with its
attendant groove may be dispensed with, and instead, a hole pierced in the
upper part of the bolt y just below the collar to receive the covered
conductor, the shed being slightly more extended than is common. Having now particularly described the nature of our said invention and in what manner the same is to be performed, we declare what we claim is:-- An insulator having a groove cut up the sides and across the top of an inner shed for the reception of a portion of covered conductor when leading off and an outer shed to fit tightly over the inner Shed and thereby protecting the covered conductor from the weather substantially as described. Dated
this Twenty-fifth day of July 1898.
DANIEL SINCLAIR
WILLIAM AITKEN |