AN IMPROVED COMPOSITION FOR COVERING BOILERS OR OTHER VESSELS OR BODIES SO AS TO PREVENT THEM LOSING OR GAINING HEAT
Year: 1884

page_text: I, DAVID BURNS, Clydesdale Bank Buildings, Bank Street, city of Carlisle, in
the County of Cumberland, Engineer, do hereby declare the nature of my invention
for AN IMPROVED COMPOSITION FOR COVERING BOILERS OR OTHER VESSELS OR
BODIES SO AS TO PREVENT THEM LOSING OR GAINING HEAT, to be as follows:-
I take, firstly, a fibrous substance as, hair, flax waste; secondly, fireclay or other
argillaceous earth; and thirdly, spent bark from the tanpit. These I thoroughly
mix and grind together along with water by preference in a mortar mill. By the
use of spent bark which is a waste product I get a cheaper and more cohesive
composition and a better non-conducting substance than has hitherto been in
general use. The presence of the bark in the composition, moreover, tends to
protect from rusting the surface of any iron to which it applied.
J

page_text: I, DAVID BURNS, of Clydesdale Bank Buildings, 10 Bank Street, Carlisle,
County of Cumberland, Engineer, do hereby declare the nature of my invention
for AN IMPROVED COMPOSITION FOR COVERING BOILERS OR OTHER VESSELS OR
BODIES SO AS TO PREVENT THEM LOSING OR GAINING HEAT and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
I take, firstly, a fibrous substance as hair or flax waste in the proportion of one
part by weight; secondly, fireclay, or other non-combustible substance in the
proportion of two parts by weight; and, thirdly, "spent bark" from the Tan pit
in the proportion of one part by weight.
These 1 thoroughly mix and grind together along with water by preference in a
mortar mill or revolving pan under edge stones till they assume the consistency of
mortar, when the composition is ready to be applied to the surface of the boiler or
other vessel as a plaster in the usual way.
I am aware that several compositions of clay and fibre have been in common use,
but by adding spent bark which is usually a waste product I get a cheaper and
more cohesive composition and a better non-conducting substance than has hitherto
been in general use.
The presence of the "bark" in the composition, moreover, tends to protect from
rusting the surface of any iron to which it is applied.
I would have. it understood that the proportions of the ingredients can be
considerably varied to suit the circumstances of particular cases, but the pro-
portions stated I have found to give good results for general use.
For example, when the heat of the surface is not excessive, as in hot water
tanks, the non-combustible component can be very much diminished or left out
altogether; and, again, when the strain on the cement is small the fibrous
component may be diminished or left out.
In these cases I usually add a small quantity of plaster-of-Paris, tar, size, or son.e
mucilaginous substance to increase the coherence of the composition.
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―
(1) The combination of "spent bark" with other materials to form a non-
conducting composition substantially as described.
Dated this Second day of December 1884.