AN IMPROVEMENT OR IMPROVEMENTS IN FIXING THE INSULATORS OF ELECtric TelegraPIIS
Year: 1877

page_text: LETTERS PATENT to John Henry Cordeaux, of Birmingham, in the County of
Warwick, Postal Telegraph Inspector, for the Invention of "AN IMPROVEMENT
OR IMPROVEMENTS IN FIXING THE INSULATORS OF ELECtric TelegraPIIS.”
PROVISIONAL SPECIFICATION left by the said John Henry Cordeaux at
the Office of the Commissioners of Patents on the 7th February 1877
JOHN HENRY CORDEAUX, of Birmingham, in the County of Warwick, Postal
Telegraph Inspector "AN IMPROVEMENT OR IMPROVEMENTS IN FIXING THE IN-
SULATORS OF ELECTRIC TELEGRAPHIS
"
In the ordinary method of fixing the insulators of electric telegraphs, the bolt by
which the insulator is supported from the aim of the telegraph pole is connected
with the insulator by one end being inscited and cemented in a hole in the interior
of the insulator, the other end of the bolt being fixed in the said aim by the screwed
end of the bolt being passed through a hole therein and secured by a screw nut.
This method of fixing renders the removal of the insulator for cleaning, repair, or
replacenient very troublesome The screw nut has to be unscrewed, the bolt
removed from the aim, and where a new insulator is requned the old one has to
be removed by melting or otherwise removing the cement The rusting of the
screw nut and screw sometimes renders the unscrewing of the nut very troublesome.
By my Invention these difficulties are obviated and the removal of the insulator
readily effected
In fixing the said insulators according to my Invention I form in the insulator a
screwed hole in place of the plain or unscrewed hole ordinarily made therein, or I
fix a screwed socket in a plain hole in the insulator On that end of the bolt
which enters the insulator I form a screw thread of a size and form proper to engage
with the concave or hollow screw formed in the hole in the insulator or in the
screwed socket described The screwed end of the bolt is separated from the plain
part of the bolt by a flange or collai In fixing the insulator, a ring or washer of
cork, india-rubber, leather, or other yielding substance is placed on the screwed end
of the bolt, the insulator is screwed on the said screwed end of the bolt, the washer
being compressed between the insulator and the shoulder on the bolt when the
CH G21

page_text: insulator is screwed home, the said washer by its elasticity holding the insulator
tightly on the screw and preventing its removal by vibration or other accidental
cause
When it is wished to remove the insulator for any purpose, its removal may be
effected by giving it an unscrewing motion when it separates from the bolt, leaving
the bolt attached to the aim of the telegraph pole The insulator is thus very
readily detached from and replaced on the bolt, and great economy both of time,
labour, and in some cases of material is effected.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Henry Cordeaux in the Great Seal Patent Office on the 1st
August 1877
t
JOHN HENRY CORDEAUX, of Birmingham, in the County of Warwick, Postal
Telegraph Inspector "AN IMPROVEMENT OR IMPROVEMENTS IN FIXING THE IN-
SULATORS OF ELECTRIC TELEGRAPHS."
In the ordinary method of fixing the insulators of electric telegraphs, the bolt by
which the insulator is supported from the aim of the telegraph pole is usually con-
nected with the insulator by one end being inserted and cemented in a hole in the
interior of the insulator, the other end of the bolt bemg fixed in tho said arm by the
sciewed end of the bolt being passed through a hole thoi ein and secured by a screw
nut This method of fixing renders the removal of the insulator for cleaning, repan,
or replacement very troublesome The screw nut has to be unscrewed and the
insulator as well as the bolt removed from the aim whenover a new insulator is
1 equned. The 1usting of the screw nut and sciow sometimes renders the unscrewing
of the nut very troublesome By my Invention these difficulties are obviated and
the removal of the insulator is readily effected
In fixing the said insulators according to my Invention,
form in the insulator
a screwed hole in place of the plain or unscrewed hole ordinarily made therein
On that end of the bolt which enters the insulator I form a screw thread of a size
and forin proper to engage with the concave or hollow sciew or screwed hole in the
insulatoi The screwed end of the bolt is separated from the plain part of the bolt
by a flange or collai or shoulder
In fixing the insulator, a ring or washer of cork,
india-rubber, leather, or other yielding substance is placed on the screwed end of the
bolt, the insulator is screwed on the said screwed ond of the bolt, the washer being
compressed between the insulator and the shoulder on the bolt when the insulatoi
is sciewed home, the said washer by its elasticity holding the insulator tightly_on
the screw and preventing its removal by vibration or other accidental cause
insulator may also be screwed on to the bolt without any washer at all
The
When it is wished to remove the insulator for any purpose, its removal may be
effected by giving it an unscrewing motion when it separates from the bolt, leaving
the b It attached to the arm of the telegraph pole
I will now proceed to describe, with reference to the accompanying Drawings,
the manner in which my Invention may be performed
Figure 1 represents in elevation, and Figure 2 in vertical section an electric
telegraph insulator fixed to its supporting bolt according to my Invention
Figure 3 represents in section the insulator separately, and Figure 4 in elevation,
the upper part of the supporting bolt separately
The same letters of reference indicate the same parts in Figures 1, 2, 3, and 4
a is the insulator which may be made of porcelain, earthenware, china, glass,
ebonite, wood, or other non-conductor of electricity, b is the bolt by which the
insulator is supported, the said bolt being connected to the arm of the telegraph
pole in the ordinary manner In the axis of the insulator and near the head thereof
a screwed hole c is made, and on the upper end of the bolt b is a screw thread d of

page_text: a size and form proper to engage with the concave or hollow screw thread of the
screwed holo c in the insulator a Between the screwed end & of the bolt b and
the plain part of the said bolt is a flange collar or shoulder 6, and supported on the
said flange collai or shoulder e is a ring or washer f of india-rubber, cork, leather,
or other yielding material, the said yielding ung or washer fsurrounding the lower
screwed part of the bolt in the manner represented in Figures 2 and 4
In fixing the insulator a, the yielding ing or washer fis first placed on the
flange, collar, or shoulder e, as represented in Figure 4, and the insulator a is then
screwed on the screwed end d of the bolt b in the manner represented in Figures 1
and 2 On screwing home the insulator a the yielding ing a or washer fis com-
pressed between the internal shoulder a³ of the insulator a and the shoulder e on
the bolt, as seen in Figure 2, the said washer ƒ by its elasticity holding the insu-
lator a tightly on the screw & and pieventing the removal of the insulator by
vibration or other accidental cause
To remove the insulator a for cleaning, repair, or otherwise, it is only necessary
to give it an unscrewing motion when it separates from the screwed end d of the
bolt b, leaving the said bolt attached to the aim of the telegraph pole. The
insulator a is thus very readily detached fion and replaced on the bolt b, and great
economy both of time, labour, and in some cases of material is effected.
The collar or flange or shoulder e on the screwed bolt b may be dispensed with.
In this case I place an india-rubber or other yielding pad inside the screwed holo c,
which pad when the insulator is screwed home upon the screwed end d of the bolt
is held between the top of the said screwed end d and the top of the screwed hole c.
But I prefer to employ the airangement of parts herein first described and repre-
sented in the accompanying Diawing, as the modification described, where a
shoulder on the bolt is not used, is less efficient than the arrangement represented.
Where the insulator is made of wood, ebonite, or other slightly yielding material
the washer or pad described may be dispensed with
Having now described the nature of my Invention and the manner in which the
same is to be performed, I wish it to be understood that I clann as my Invention,
the improvement or improvements in fixing the insulators of electric telegraphs
berein-before described and illustrated in the accompanying Diawing, that is to
say, making in the interior of the insulator a concave or hollow screw or screwed
hole, and making on the upper end of the supporting bolt of the insulator a convex
screw, the insulator being fixed by being screwed direct on to the said screwed bolt,
the said fixing parts being used by preference in combination with a ring or washer
oi pad of india-1ubber or other yielding material supported on a collar, flange, or
shoulder on the screwed bolt, or placed between the top of the screwed bolt and the
top of the screwed hole in the insulator, for the purpose and substantially as
described and illustrated
In witness whereof, I, the said John Henry Cordeaux, have hereunto set
my hand and seal, this Twenty-eighth day of July, in the year of our
Witness,
OWEN THOMAS,
High Street,
Rbyl
JOHN HENRY CORDEAUX. (LS)

page_text: In the Matter of a Patent granted to John Henry Cordeaux, of Birmingham,
in the County of Warwick, Postal Telegraph Inspector, for the Invention
of "AN IMPROVEMENT OR IMPROVEMENTS IN FIXING THE INSULATORS
OF ELECTRIC TELEGRAPHS," the same bearing date the 7th day of
February 1877.
DISCLAIMER AND MEMORANDUM OF ALTERATION proposed to be
entered by the said John Henry Cordeaux as such Patentee as aforesaid, pursuant to
the statutes in that case made and provided.
WHEREAS since filing the Specification to the said Letters Patent for
an improvement or improvements in fixing the insulators of electric telegraphs,
I have found that portions of the Invention therein described are less useful than
I at that time supposed
And whereas in respect to such portions I do not desire to make or retain any
claını
And whereas I desire also to correct a certain clerical error in the said
Specification, I therefore for these reasons desire to disclaim and alter my said
Specification, and I do hereby disclaim and alter the same by striking out at page 2
of the Specification, as it is printed by Her Majesty's Printers, at lines 36 and 37,
the words "The insulator may also be screwed on to the bolt without any washer
at all"; also by inserting on the same page, at line 48, after the word "china" the
word "or", also by striking out on the same page, at line 49, at the
commencement of the line, the words "ebonite, wood, or other non conductor of
electricity", also by striking out on page 3, at line 10, after the words "yielding
ring," the letter "a", also by striking out on page 3, at lines 20 to 28, the
paragraphs commencing with the words "The collar" at the beginning of line 20,
down to the words "dispensed with " at the end of line 28, also by striking out on
the same page, at line 36, after the words " being used," the words "by preference
also by striking out on the same page, at line 38, after the words "screwed bolt,"
the words "or placed " down to the end of the line, and in the next line from the
commencement of the line as far as and including the words "the insulator"
"
And in order that the effect of this Disclaimer and Memorandum of Alteration
may be better understood, I annex a copy of the Specification as it will appear
when such Disclaimer and Memorandum of Alteration has been made as aforesaid

page_text: « TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
" HENRY CORDEAUX, of Birminghai, in the County of Warwick, Postal Telegraph
Inspector, send greeting
**
"
* WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
"Patent, bearing date the Seventh day of February, in the year of our Lord
"One thousand eight hundred and seventy-seven in the fortieth year of Her reign,
"did, for Herself, Her heirs and successors, give and grant unto me, the said John
“ Henry Cordeaux, Her special license that I, the said John Henry Cordeaux, my
"executors, administrators, and assigns, or such others as I, the said John Henry
"Cordeaux, my executors, administrators, and assigns, should at any time agice
with, and no others, fiom time to tune and at all times thereafter during the
* term therein expressed, should and lawfully might make, use, exercise, and vend,
"within the United Kingdom of Great Britain and Ireland, the Channel Islands,
"and Isle of Man, an Invention for 'AN IMPROVEMENT OR IMPROVEMENTS IN
"FIXING THE INSULATORS OF ELECTRIC TELEGRAPUS,' upon the condition
(amongst others) that I, the said John Hemy Cordeaux, my executors or
administrators, by an instrument in writing under my, or their, or one of then
"-hands and seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and cause the
same to be filed in the Great Scal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent
SE
"
"
86
"
“NOW KNOW YE, that I, the said John Henry Cordeaux, do hereby declare
"the nature of the said Invention, and in what manner the same is to be performed,
" to be particularly described and ascertained in and by the following statement
"thereof, that is to say.-
$6
"In the ordinary method of fixing the insulators of electric telegraphs, the bolt
by which the insulator is supported from the aim of the telegraph pole is usually
" connected with the insulator by one end being inserted and cemented in a hole
" in the interior of the insulator, the other end of the bolt being fixed in the said
arm by the screwed end of the bolt being passed through a hole therein and
"secured by a screw nut This method of fixing renders the removal of the
" insulator for cleaning, repan, or replacement very troublesome
The screw nut
"
" has to be unsciewed, and the insulator as well as the bolt removed from the arm
" whenever a new insulator is required The 1usting of the screw nut and screw
" sometimes renders the unscrewing of the nut very troublesome
By my
" Invention these difficulties are obviated and the removal of the insulator is
1eadily effected
"
"
#
In fixing the said insulators according to my Invention I form in the insulator
a screwed hole in place of the plain or unscrewed hole ordinarily made therein
"On that end of the bolt which enters the insulator I form a screw thread of a
size and form proper to engage with the concave or hollow screw or screwed hole
in the insulator The screwed end of the bolt is separated from the plain part of
"the bolt by a flange, or collar, or shoulder In fixing the insulator a ring or
"washer of cork, india rubber, leather, or other yielding substance is placed on the
" screwed end of the bolt The insulator is screwed on the said screwed end of the
bolt, the washer being compressed between the insulator and the shoulder on
"the bolt when the insulator is screwed home, the said washer by its elasticity
holding the insulator tightly on the screw and preventing its removal by
"vibration or other accidental cause
"t
"
"When it is wished to remove the insulator for any purpose its removal may be
"effected by giving it an unscrewing motion, when it separates from the bolt,
leaving the bolt attached to the arm of the telegraph pole
"
"I will now proceed to describe with reference to the accompanying Drawings
"the manner in which my Invention may be performed
st
$6
Figure 1 represents in elevation and Figure 2 in vertical section an electric
telegraph insulator, fixed to its supporting bolt according to my Invention

page_text: "
Figure 3 represents in section the insulator separately, and Figure 4 in
clevation the upper part of the supporting bolt separately
"The same letters of reference indicate the same parts in Figures 1, 2, 3, and 4 ¦
"
a is the insulator, which may be made of porcelain, car then ware, china, or glass,
"bis the bolt by which the insulator is supported, the said bolt being connected
"to the aim of the telegraph pole in the ordinary manner In the axis of the
"insulator, and near the head thereof, a screwed hole c is made, and on the upper
"end of the bolt b is a screw thi cad d, of a size and form proper to engage with
"the concave or hollow screw thread of the screwed hole c in the insulator a.
"Between the screwed end d of the bolt b and the plain part of the said bolt is a
flange collar or shoulder e, and supported on the said flange collar or shoulder e
is a ling or washer f of india rubber, cork, leather, or other yielding material, the
"the said yielding ring or washer surrounding the lower screwed part d of the
"bolt, in the manner represented in Figures 2 and 4
c
"
"
"
"In fixing the insulator a the yielding ring or washer f is first placed on the
flange, collar, or shoulder e, as represented in Figure 4, and the insulator a 18
"then screwed on the screwed end à of the bolt b, in the manner represented in
Figures 1 and 2. On sciowing home the insulator a the yielding ung or
"washer fis compressed between the internal shoulder a² of the insulator a and
"the shoulder e on the bolt, as seen in Figure 2, the said washer by its elasticity
holding the insulatoi a tightly on the screw d, and preventing the removal of the
"insulator by vibration or other accidental cause
E
"To remove the insulator a for cleaning, iepan, or other wise, it is only necessary
"to give it an unscrewing motion, when it separates from the screwed end d of
"the bolt b, leaving the said bolt attached to the arm of the telegraph pole
"The insulator a is thus very readily detached from and replaced on the bolt b,
"and great economy both of time, labour, and, in some cases, of material, is
"offected
CE
"
Having now described the nature of my Invention, and the manner in which
"the same is to he performed, I wish it to be understood that I claim as my
"Invention, the improvement or improvements in fixing the insulators of electric
telegraphs herein before described and illustrated in the accompanying Drawing,
"that is to say, making in the interior of the insulator a concave or hollow sciew
or sciewed hole, and making on the upper end of the supporting bolt of the
"insulator a convex screw, the insulator being fixed by being screwed direct on to
"the said screwed bolt, the said fixing parts being used in combination with a
1ng, or washer, or pad of india rubber or other yielding material, supported on a
collar, flange, or shoulder on the sciewed bolt for the purpose, and substantially
as described and illustrated."
CE
In witness whereof, I, the said John Henry Cordeaux, have hereunto set my
hand and seal, this Fifteenth day of March, in the year of our Lord One
thousand eight hundred and eighty one
5
JH CORDEAUX. (L.S.)
To the Commissioners of Patents for Inventions.
I hereby grant my fat, giving leave to the above named John Henry Cordeaux
to file in the Great Seal Patent Office, with the Specification to which the same
relates, the above written Disclaimer and Memorandum of Alteration
Dated this Fourth day of May, One thousand eight hundred and eighty one
FARRER HERSCHELL.