A MACHINE OR INSTRUMENT FOR THE BETTER HEATING OVENS, CALLED THE SUN
Year: 1815

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
BURTENSHAW, of. Green Street, Bennetts Row, Blackfriars Road, in the
County of Surrey, Oven Builder, send greeting.
WHEREAS His present Majesty King George the Third, in and by
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Twenty-fourth day of June last, for Himself, His heirs and
successors, did give and grant unto me, the said John Burtenshaw, together
with Samuel Balden, of Redditch, in the County of Worcester, Miller, His
especial licence, full power, sole privilege and authority, that they, the said
Samuel Balden and John Burtenshaw, their executors, administrators, and
assigns, by themselves, or by their deputy or deputies, servants, or agents, or
such others as they, the said Samuel Balden and John Burtenshaw, their
executors, administrators, or assigns, shall at any time agree with, and no
others, from time to time and at all times thereafter during the term of years
therein expressed,should and lawfully might make, use, exercise, and vend their
said Invention, within that part of the United Kingdom of Great Britain and
Ireland called England, Wales, and the Town of Berwick upon Tweed, their
Invention of "A MACHINE OR INSTRUMENT FOR THE BETTER HEATING OVENS,
CALLED THE SUN;" in which said Letters Patent there is contained a proviso
obliging the said Samuel Balden and John Burtenshaw, by an instrument in
writing under their hands and seals, or under the hand and seal of one
of them, particularly to describe and ascertain the nature of the said Inven-
tion, and in what manner the same is to be performed, and to cause the

page_text: .
same to be inrolled in His Majesty's High Court of Chancery within six
calendar months next and immediately after the date of the said recited
Letters Patent, as in and by the same, reference being thereto had, will more
fully appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Burtenshaw, do hereby describe and ascertain the nature of the said
Invention, and in what manner the same is to be performed, by the plan or
Drawing annexed to these Presents, and the following description thereof,
that is to say:-
A new constructed furnace, called by me a sun, to be applied for the
heating of bakers' ovens instead of those fire-places or furnaces heretofore
used for that purpose, and is performed by introducing a fire into the oven
from under the bottom, to be raised by means of either a lever or rack and
pinion, but the lever I prefer; an explanation of the contrivance and manner
of working which will fully appear by reference to the Drawing hereunto
annexed and the following description, that is to say :-Fig. 1 represents the
sun or iron furnace A, with burning coal placed upon an ash-pan or frame B,
made of sheet iron or other fit material, which frame is fitted into a groove or
rabbet on the top or rim of the carriage C; this carriage, with the sun, is
raised up into the oven in a groove (to be hereafter described) either by a
lever or rack pinion, as before stated. Figs. 2 and 3 represent sections of the
oven and the necessary vault (about six feet deep under the same) to admit of
the situation and action of the lever and furnace. (a) is a standard supporting
the lever (6) upon a pivot or centre (c), which lever is attached to the sun
carriage by means of two chains and a shackle, as seen at(d), but more clearly
in Fig. 1, where the shackle is represented as having holes to receive bolts to
attach the end of the lever to it. The two uprights of the sun carriage
marked (e, e,) are intended to slide in two grooves (f) of an iron frame fixed
for that purpose on each side of the vault, one of which grooves can only be
seen in the sections; at the longer end of the lever is a loggerhead or weight
to counterbalance the weight of the sun and its carriage, and the lever moving
upon the centre (C), the fire will be elevated or depressed accordingly through
the cylindrical aperture (D) in the floor or bottom of the oven. In the section
represented at Fig. 2 the longer arm of the lever is seen depressed, and the
shorter arm elevated, which being connected by the chains and shackle to the
carriage, as before described, the furnace or sun is seen raised up through the
opening D into the oven, and the rim C lying in close contact with the under
plate of the aperture prevents the passage of any air except the draft which
passes through the fire. In the section represented at Fig. 3, the lever is seen