A CONSIDERABLE IMPROVEMENT IN THE CONSTRUCTION OF WIND AND WATER MILLS, WHEREBY THEIR POWER IS INCREASED TO A MUCH GREATER DEGREE THAN HAS BEEN HITHERTO EFFECTED
Year: 1792

page_text: SILVESTER'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
SILVESTER, of Mark Lane, in the City of London, Millwright, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Fourteenth day of Junc, in the thirty-second year of His
reign, give and grant unto me, the said George Silvester, His especial licenco
that I, the said George Silvester, 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 "A CONSIDERABLE
IMPROVEMENT IN THE CONSTRUCTION OF WIND AND WATER MILLS, WHEREBY THEIR
POWER IS INCREASED TO A MUCH GREATER DEGREE THAN HAS BEEN HITHERTO
EFFECTED;" in which said Letters Patent there is contained a proviso obliging
me, the said George Silvester, 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 His
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) will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
George Silvester, do hereby declare that my said Invention is described in the
plan and description thereof hereunto annexed.
In witness whereof, I, the said George Silvester, have hereunto set my
hand and seal, this Eleventh day of July, in the year of our Lord
One thousand seven hundred and ninety-two.
GEORGE SILVESTER. (L.S.)
Price 25p

page_text: AND BE IT REMEMBERED, that on the same Eleventh day of July, in
the year above mentioned, the aforesaid George Silvester 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 5
in that case made and provided.

page_text: Fig 1. represents the Plan of the Upper part of the Sails or Vanes Arms and Darts of a Horizontal Wind Mill with twelve Sails or Vanes, but which may be made of more or less, and the true position given by means of
Wheels and Pinions explained more fully as under Nº1. in Figl, is a Dart or other Figure the Broad part of which must be made of sufficient size for the Wind to act upon so as to counteract the Friction of the
Wheels which give Motion to the Sails or Vanes No 2 is a Dart or other Figure that Swivels on the Spindle N5.. Nº3. Is a Rope passing over a lulley Nº4 at the end of whach Rope is a Weight sufficient in Quantity to ex-
And the Darts Nº1 and 2 against a moderate Wind in the Angle represented in Fig. 1. But by the Increase of Wind the Dart Nº1 Gives way and turns the Spindle Nº5. to which Spindle which goes through the Centre of the Ball
and at the bottom end is fixt the Wheel N°6 represented in Fig 2. by the turn of which Spindle and Cog Wheel the Position of the Sails is altered so as the Wind will have less Power on them as it increses Fig 2 Nº1,2,
3,4,5 and 6 described already N°8 are Spindles supported by the Shaft N14 and the Arms Nº12 having Pinions fixed on the Ends. N° 7 are Pinions which work round on the Cog Wheel N6 when the Mill is in
motion on the other Find of which is a Pinion Nº9 fixt half the Diameter of the Pinions No7 (This Proportion must be obsersed in Mills of every Scale The Pinion Nº9 works in the Cog Wheel Nº10 fastened on the bud
-geon fixt in the Centre of the Sail or Vane N°IL this Wheel is of the same diameter as the Cog Wheel Nº6 Noll are the Sails or Vanes working with Gudgeons top and bottom and whach make half a Revolution on
their own Gudgeons or Pivots in the same time that the Arms.V12 and the Shaft Nº14 make one revolution Which Proportionale Motion is Given when the Mill is in Action by the Inions 7 working round the Cog Whee
N6 which Cog Wheel is moved only by the shift of Wind and increase of wind by which means the Sails or Vanes VII are always in their proper position to receive the WindFig. 2. N.º3 is a Gudgeon fixt in the cen-
-tre of the Shaft N°14 and works and is supported in the hollow of the Spindle N°5 The mode of stopping this Mill is by pulling down the Lever end Nº17 which gives motion to the Levers N°15 and drops the in-
chine Plains Nº16 connected by Joints to a Gross Bar fixed to the perpendicular rod of the Sails or Vanes Nl which permits the Sails or Vanes to fold back and thereby stop the Mill. 18,18,18,18 Represents part of the Building which supports
the Mill &c. Fig 1 The two hedd and dotted lines represent the way the Wind sets on the Mill in this Position and each Sail or Vane Nº11 must be put into the Gears in the two different Angles as represented in Fig.1 Fig. 3. Represents on
of the Darts or i regulating lanes. The same Motion may be likewise applied to Floats of Water Wheels, or to the working of common Boats without Dars, The method of which is shewn in Fig.1 and worked vertically in such Frame
or Supporters as convenient
Fig.4 Is a horizontal Windmill worked by the Wind acting on Sails or Vanes furt to a Chain by pivots that permit the Sail to move which Chains are suspended by four Horizontal Whe
which may be placed at any Instance agreeable to the Number of Sails or Vanes required. a is a dart to swivel on a Spindle fastened to the Centre of Shaft B Fig 5 C Is a Rope at the end of which is a weight sufficient to
prevent the Main Shaft from turning in moderate Winds so that the Mill may keep the longest side to the Wind. But by an Increase of Wind on the Mill causes it to overpower the weight which is connected to the Dart, but
as the Wind decreases the weight draws back the Mill to its proper position by this Motion the Mill is regulated Fig: 5.e.c. Arms which go through the Main Shaft ffff, are Wheels turning between ee, and fastened to the
Shafts LLLL which have Gudgeons working in the Arms e.e. 9.9.99. are Nogged Chains working round the Wheel ffff_hhhhhh Represent six of the Sails or Tanes working in the Chains with Pivots, fixt in
the Sail or Vane one third out of the Centre at each end working in holes at equal distances in the Chains gg_ii Fig 4 Represents a Rope fixt to the longest corner of each Sail or Vane to the Chaing, to give the
Sail or lame the Anale required Fio KKKK Represent part of the Building which supports the Mill