IMPROVEMENTS IN APPA- RATUSES FOR DRYING AND HEATING
Year: 1860

page_text: LETTERS PATENT. to Robert Davison,. of London Street, in the City of.'
London, Civil Engineer, for the Invention of. "IMPROVEMENTS IN APPA-
RATUSES FOR DRYING AND HEATING."
Sealed the 4th June 1861, and dated the 10th December 1860.
PROVISIONAL SPECIFICATION left by the said Robert Davison at the
Office of the Commissioners of Patents, with his Petition, on the 10th
December 1860.
I, ROBERT DAVISON, of London Street, in the City of London, Civil Engineer,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
APPARATUSES FOR DRYING AND HEATING," to be as follows:-
My Invention consists in the combination of a fan with a coil or coils of
pipes or tubes heated. by steam, superheated steam, hot liquid, hot air, or
other heating medium caused to circulate through the same, and with spaces
for air between the pipes, in such manner that air introduced into the appa-
ratus is caused by the fan to flow round and between the pipes, and become
heated by contact therewith before being driven from the apparatus.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of December, in the year of our Lord One
thousand eight hundred and sixty, in the twenty-fourth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Robert Davison, Her special licence that I, the said Robert Davison, my
executors, administrators, and assigns, or such others as I, the said Robert
Davison, my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time 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 "IMPROVEMENTS IN APPA-
RATUSES FOR DRYING AND HEATING," upon the condition (amongst others) that I,
the said Robert Davison, my executors or administrators, by an instrument
in writing under my, or their, or one of their hands and seals, should par-
ticularly 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 Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Davison, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, reference being had to the Drawings hereunto annexed,
that is to say:-
My Invention consists in the combination of a fan with a coil or coils of
pipes or tubes heated by steam, superheated steam, hot liquids, hot air, or
other heating medium caused to circulate through the same, and with spaces
for air between the pipes, in such manner that air introduced into the apparatus
is caused by the fan to flow round and between the pipes, and become heated
by contact therewith before being driven from the apparatus.
Figure 1 is a vertical section, Figure 2, a transverse section, and Figure 3,
a plan of one of my heating and drying apparatus, shewing a steam engine
applied, and in which two air -spaces are provided; Figure 4 is a plan, and
Figure 5 a section of another arrangement of my heating and drying appa-
ratus, in which there are seven air spaces. Similar letters refer to similar
parts in all the Figures.
A, A, are coils of metal tubes, which may be of the ordinary construction,
or, as I prefer, may be formed by uniting double corrugated plates, as set
forth in the Specification of Letters Patent granted to me 21st September
1859 (No. 2152), and as shewn in the accompanying Drawings. Steam or

page_text: other heating medium is admitted into the tubes at a, a, and after circulating
through the entire length of the coils, passes out through the outlet at b, b.
The coils of tubes are enclosed within a casing c, c, the sides of which are
connected and stayed by bolts and nuts, as shown at Figures 1, 2, and 3, or
the casing is connected as shewn at Figures 4 and 5; B, B, are spaces
between the coils of heating pipes, and C is the fan surrounded by the pipes.
Air is drawn from the atmosphere, and driven by the fan C through the
spaces B, B, becoming dried and heated in its passage by contact with the
heating pipes A, A. It is driven out of the apparatus at d to be used as
required. The waste steam from a steam engine, especially when used for the
purpose of driving the fan, as in the arrangement shown at Figures 1, 2,
and 3, will be generally found sufficient for heating the coils of tubes; but
where a high degree of heat is required, I find it convenient to pass the
exhaust steam through a superheater before allowing it to enter the tubes of
my drying and heating apparatus. In order to allow for any condensation
that may take place in the coils, I provide openings and taps at the lower part
of each coil for the purpose of drawing off any condensed water that may be
formed therein.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I do not limit myself to
the arrangements of coils of tubes through which the heating medium is to
pass, herein-before described and represented in the accompanying Drawings,
nor do I limit myself to the employment of exhaust steam superheated or not;
but I claim the combination of a fan with a coil or coils of pipes, heated as
herein-before described, for the purpose of drying and heating air driven by the
fan through air spaces between the said coil or coils of pipes, substantially in
manner herein-before described.
In witness whereof, I, the said Robert Davison, have hereunto set my
hand and seal, this Sixth day of June, One thousand eight hundred
and sixty-one.