SAWS AND MACHINERY UPON AN IMPROVED CONSTRUCTION FOR SAWING TIMBER IN AN EASY AND EXPEDITIOUS MANNER
Year: 1805

page_text: BRUNEL'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MARC
ISAMBARD BRUNEL, of Portsea, in the County of Hants, Gentleman, send
greeting
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Seventh day of May, in
the forty-fifth year of His reign, give and grant unto me, the said Marc Isam-
baid Brunel, His especial license that I, the said Maic Isambard Brunel
during the term of years therein mentioned, should and lawfully might use,
exercise, and vend, within England, Wales, and the Town of Berwick-upon-
Tweed, my Invention of " SAWS AND MACHINERY UPON AN IMPROVED CONSTRUCTION
FOR SAWING TIMBER IN AN EASY AND EXPEDITIOUS MANNER," in which said
Letters Patent there is contained a proviso obliging me, the said Marc Isam-
baid Brunel, by an instrument in writing under my hand and seal, to cause a
particular description of the nature of my said Invention, and in what manner
the same is to be performed, to be inrolled in Ilis Majesty's High Court of
Chancery within one calendar month after the date of the said recited Letters
Patent, as in and by the same (relation being thereunto had) may more fully
and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said Marc
Isambard Brunel, do hereby declare that my said Invention is described by
the drawings and explanations thereof hereunto annexed, and the following
description thereof, viz* :-
The saws are intended to be of a circular form, and, in order to obtain a
great diameter, made of two or more pieces of sheet steel, properly adjusted and
fixed together: see Figures 1, 2, 3, 4, and 7. The saw, Figure 1, is made of
eight pieces. The pieces A, A, A, having been cut to the proper shape, and

page_text: fitted together at the edges, as represented at B, Figure 4, are screwed (see
1, 1, 1, Figure 1) against a flanch A, Figure 2, which has been previously
turned very flat The holes through which the screws pass are cut in an
oblong form in order to admit of adjustment When the plates have been
thus tastened to the flanch A another flanch C, Figure 1 and 2, is laid upon
the plates, and in order to make it fit and bear with equal power upon each
plate several thicknesses of paper or leather of the size of the flanch arc
place between it and the plates. The flanch C is fastened to the other by
screws, 2, 2, 2, &c Before they are screwed tight the plates are drawn in
concentrically, by means of wedges 3, 3, 3, &c., in order to close the joints
It must be observed that the Joints made in the form B, l'igure 4, must be
turned according to the direction of the revolving motion of the saw.
composed of three or more pieces are intended to be fitted and fastened in
the manner before described
If composed of two pieces-see Figure 3-the
Joining edge must be hollow at the part A of the plate and sharp at B. see
A and
Saws
B.
SPECIFICATION OF THE MACHINERY.
Saws
The improvements in the machinery for sawing timber in an casy and expe-
ditious manner consist in the modes of laying and holding the piece of wood in
the camage or drag, in the facility of shifting the saw from one cut to another,
and in the practicability of sawing both ways, either towards or from the saw or
The Figures 5, 6, 7, and 8 represent the machinery fitted up with one
circular saw only, the circular saw A is adjusted upon a spindle of a cylindrical
form, which turns within rodings C, C. The saw is intended to be turned with
either a stiap or a band moved by any power (water, wind, steam, horses, or men)
The dium D, Figure 5 and 6, is to receive a strap The log or piece of timber
(see L, Figure 5, 6, 7, 8, is placed upon a diag or cariige 1', and hold fast by
means of clamps G. The carriage or drag is moved to and from the saw by the
handle or ciank H, Figures 5, 6, and 8, communicating by the assistance of cog
wheels to a pimon J, Figure 5 and 7, which engages in a rack K, Figure 7.
The diag or carriage is furnished with rollers in order to caso its longitudinal
motion, and is intended to be moved by hand in order to accelerate or stop it at
pleasure The length of the carriage or drag is according to the size of the
timber intended to be converted by such machinery When the saw has per-
formed one cut it is shifted to the next in the following manner -Supposing,
for example, that the saw has been through the first cut 1-see the log E,
Figure 5; the saw is then moved collaterally to the next cut 2, and so on,
and kept to its place by means of a screw N, Figure 5 and 6; this screw N
is complete at one end to the extremity of the cylindrical shafts, and passes in

page_text: a direction parallel to it through the rodings C +, Figures 5, 6, and 8. This
manner of sawing timber requires no fastening to the log when it is intended
to be slabed only, excepting, however, when the log is crooked, in which case
it may be forced to become straighter by the assistance of the clamps G, G,
Figures 5, 6, 7, 8 M, M, Figure 8, represent circular wedges intended to
follow the cut opened by the saw, and by that means to case the friction and to
steady the piece of wood The circular wedges more collaterally when shifted,
in order to meet with the next cut of the saw The drag or carriage might
be moved (if found more advantageous) by the machinery which gives motion
to the saw The Figures 9 and 10 represent the manner of adjusting several
saws on one spindle, by which means a piece of wood may be partly or
entirely converted at one operation, in that case the flanches of the saws are
fixed upon an iron drum A, Figures 9 and 10, and kept firm and close with
each other by four bolts 1, 2, 3, 4, Figure 10. In order to lower saw or saws
when they wear away, the side rails P, P, Figures 9 and 10, may be depressed
It must be observed that
by means of the wedges Q, Q, Figures 9 and 10
the log or piece of wood does not lay close upon the drag or carriage; it is
raised by some pieces placed crosswise see 0, 0, 0, Figures 5, 6, 7, and 8.
The circular wedges described at M, M, Figure 8, are also represented at M,
Figure 11, they revolve by the motion of the log, and keep each piece, and
consequently the whole log, steady Figure 12 represents an instrument com-
posed with one or several plates of metal, to be used in lieu of the circular
wedge or wedges, the distance between these plates is regulated by that
between the saws Figure 18 represents the breadth of the plates described
above
In witness whereof, I, the said Marc Isambard Brunel, have hereunto set
my hand and seal, the Seventh day of June, in the year of our Lord
One thousand eight hundred and five.
M I. BRUNEL (L.S)
AND BE IT REMEMBERED, that on the same Seventh day of June, in
the year above mentioned, the aforesaid Marc Isambard Brunel came before
our Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained, in form above written.
And also the Specification aforesaid was stamped according to the tenor of
the statute in that case made and provided.