IMPROVEMENTS IN COVERINGS OR CASINGS FOR HEATED AND COLD SURFACES
Year: 1879

page_text: LETTERS PATENT to John Bell, of Southwark, in the County of Surrey,
Asbestos Manufacturer and Merchant, for the Invention of "IMPROVEMENTS
IN COVERINGS OR CASINGS FOR HEATED AND COLD SURFACES."
0001
PROVISIONAL SPECIFICATION left by the said John Bell at the Office of
the Commissioners of Patents on the 6th June 1879.
JOHN BELL, of Southwark, in the County of Surrey, Asbestos Manufacturer and
Merchant. "IMPROVEMENTS IN COVERINGS OR CASINGS FOR HEATED AND COLD
SURFACES."
My Invention relates to coverings or casings for steam and heated pipes, boilers,
and other heated apparatus or surfaces from which it is desired to prevent loss of
heat by radiation, and also to refrigerating apparatus or other surfaces to prevent
transmission of heat thereto.
The said coverings or casings can be made and supplied ready for application,
like sleeves, to such parts as the free ends of pipes; they can also be built in
position around pipes, cylinders, and other apparatus with curved or irregular
exterior surfaces; and they can, after being made into tubes, be slit longitudinally
and afterwards sprung into position; or they can be opened out and applied to
plane or other surfaces. A feature of special value secured by my Invention for
the objects which most usually require coating is elasticity, inasmuch as my said
coverings or casings can be freely bent and made to fit curved and irregular forms
without the necessity of cutting out portions.
In carrying my Invention into use I proceed in manner following:-I first take
a strip or strips of asbestos, millboard, paper, felt, or cloth, and overlap, wind it
spirally, or lay it into a hollow tube. Over the said tube I place a layer of hair,
felt, charcoal, cork, or other substance known to be a bad conductor of heat.
Subsequently I enclose the whole in a wrapper or bandage of oil cloth or other
material, preferably laid spirally. The said hair, felt, or other heat non-conductor
and the wrapper or bandage may be laid on in repeated layers.
A second part of my Invention consists in surrounding surfaces with asbestos,
paper, or millboard, and in leaving a space between the said asbestos and the object
to be protected, so that a space for still or comparatively still air is enclosed.
Chaplets or the like are employed to keep the asbestos from touching the object,
and such asbestos is made tight exteriorly by an oiled wrapper or otherwise.

page_text: The Drawings only show the application of my Invention to pipes; it will,
however, be obvious that the above described coatings or casings are equally
applicable to plain, curved, or irregular surfaces.
Having now described ny said Invention in such manner that others will be
enabled to carry my improvements into effect, I claim,―
Constructing and applying coverings or casings to the surfaces of pipes, boilers,
or other apparatus with the materials arranged and combined substantially in the
manner and for the purposes set forth.
In witness whereof, I, the said John Bell, have hereunto set my hand and
seal, this Fourth day of December, in the year of our Lord One thousand
eight hundred and seventy nine.
JOHN BELL. (L.S.)