IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES
Year: 1871

page_text: LETTERS PATENT to Charles Herbert Holt, of Manchester, in the
County of Lancaster, Engineer, for the Invention of "IMPROVEMENTS
IN STEAM BOILER AND OTHER FURNACES."
Sealed the 12th September 1871, and dated the 15th March 1871.
PROVISIONAL SPECIFICATION left by the said Charles Herbert Holt
at the Office of the Commissioners of Patents, with his Petition,
on the 15th March 1871.
I, CHARLES HERBERT HOLT, of Manchester, in the County of Lan-
3 caster, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN STEAM BOILER AND OTHER FURNACES," to be as
follows:
In carrying out my improvements I prefer to cast the fire-bars in
groups of three or more together, and at each end of each of such groups
there is formed a curved nipple or boss to rest, with capability of rocking,
in corresponding recesses formed for them in bars at the sides or other
parts of the furnace. At, by preference, about the centre of the under-
side of each group of bars there is a stud or projection, and these studs

page_text: or projections from the several groups are received into corresponding
parts formed for them in a bar passing underneath them with capability
of motion so as to cause the whole of the bars connected therewith to
be simultaneously rocked in either direction as desired. Motion is
given to this bar, which effects the rocking of the fire-bars by a bell-
crank lever, one end of which is by pin-joint connected to such bar,
whilst the other end of it is formed as a handle by which the rocking
of the bars in opposite directions is obtained for the riddling out of
the small ashes and the breaking up of the clinkers.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Charles Herbert Holt in the Great Seal Patent
Office on the 14th September 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
HERBERT HOLT, of Manchester, in the County of Lancaster, Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of March, in the year
of
our Lord One thousand eight hundred and seventy-one, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Charles Herbert Holt, Her special
licence that I, the said Charles Herbert Holt, my executors, admi-
nistrators, and assigns, or such others as I, the said Charles Herbert
Holt, my executors, administrators, and assigns, should at any time.
agree with, and no others, from time to time and at all times there-.
after 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 STEAM BOILER AND OTHER FURNACES," upon the con-.
dition (amongst others), that I, the said Charles Herbert Holt, my
executors or administrators, by an instrument in writing under my, or
their, or one of their hands and scals,, 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
Seal Patent Office within six calendar months next and immediately
after the date of the said Letters Patent.

page_text: may be capable of a rocking motion, and assume positions such as those
indicated by Figures 1 and 2.
In Figure 1 the bars are shewn in what I call the "backward motion,"
that is, that position by bringing them into which would have a tendency
to throw the fuel supported thereby back towards the front of the
furnace, whilst in Figure 2 the bars are shewn rocked in the opposite
direction, or the forward motion by which the fuel carried by them
would be thrown forward towards the back of the fire-place. In order
readily to effect these movements each bar or group of bars a has cast
in its under side and at about its centre a wrought-iron pin c, which
projects downwards, so that the projecting end of each of such pins may
be received into a corresponding hole formed for it in a longitudinal
bar d. These holes in this bar d are somewhat enlarged on their upper
and lower surfaces to admit of the pins c freely rocking therein. The
front end of this bar is formed with a screwed neck to pass through a
suitable hole formed for it in one end of the bell-crank or L lever e, and
it is there held, with capability of adjustment, by screw nuts d. The
L lever e is supported to turn on a fixed centre of motion e¹, and it is
capable of receiving a handle e³, by acting on which a to-and-fro motion
may be imparted to the bar d, and thence a rocking motion be given to
the groups of bars a, a. The bar dis held up on the pins c by split
pins c passed through the outer ends of the pins c. By these means the
ashes and broken clinkers formed during combustion of the fuel may be
readily riddled through or between the bars.
Having thus described my improvements, and means which I adopt
in carrying the same into effect, I would have it understood that I do
not confine myself to the precise arrangement of parts as shown and
described, as these may be varied without departing from the peculiar
character of my Invention.
In witness whereof, I, the said Charles Herbert Holt, have hereunto
set my hand and seal, this Twelvth day of September, in the
year of our Lord One thousand eight hundred and seventy-one.
CHARLES H. HOLT. (L.S.)