AN AXIS OR SPINDLE TO BE FIXED IN CRANKS AND PULLEYS USED IN BELL-HANGING AND OTHER MECHANICAL OPERATIONS UPON A NEW CONSTRUCTION
Year: 1777

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, COLIN
MACKENZIE, of the Parish of Saint Martin in the Fields, in the County of
Middlesesex, Whitesmith, sond greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Ninth day of January, in the seventeenth year of His reign,
did give and grant unto me, the said Colin Mackenzie, His especial licence,
full power, sole priviledge and authority, that I, the said Colin Mackenzie,
my executors, administrators, and assigns, should and lawfully might, during
the term of years therein expressed, make, use, exercise, and vend, within
that part of His Majesty's Kingdom of Great Britain called England, His
Dominion of Wales, and Town of Berwick-upon-Tweed, my Invention of
"AN AXIS OR SPINDLE TO BE FIXED IN CRANKS AND PULLEYS USED IN BELL-HANGING
AND OTHER MECHANICAL OPERATIONS UPON A NEW CONSTRUCTION;" in which said
recited Letters of Patent is contained a proviso obliging me, the said Colin
Mackenzie, 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 four calendar months after the date of the said
Letters Patent, as in and by the said Letters Patent, relation being thereunto
had, may more at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Colin Mackenzie, do hereby declare that the nature of my said Invention,
and the manner in which the same is to be performed, is described and
ascertained in manner and form following, that is to say :-

page_text: The axis or spindle is fixed in the center of cranks, quadrants, pulleys,
levers, &c., used in bell-hanging, are made with tapering or conical points, to
act in conical cavities or centers made in the frame or mortice, and on some
occasions with pivots which act in holes made in the frame or mortice.
In both which cases a steadiness is given to the motion of the crank, &c. in
proportion to the length of its axis; and the quantity of friction is diminished
on the points or pivots of the axis, by having the action confined almost to a
point, by which means the application of oyl is tendered unnecessary, and all
the inconveniences attending its application are removed. This principle may
be applied by making the hollow centers in the ends of the axis, which may
be made of the same piece of metal with the crank, quadrant, &c., and having
the points or pivots fixed to the frame or mortice, and in various other modes
which it would be unnecessary here to enumerate, as it is the principle of
applying an axis, or anything analagous to it under whatever name, that claims
the protection of the Patent.
In witness whereof, I have hereunto set my hand and seal, this Four-
teenth day of April, in the year of our One thousand seven hundred
and seventy-seven.
LIN MACKENZIE. (L.8.)
Sealed and delivered (being first duly
stamped) in the presence of
THO HANDLEY.
AND BE IT REMEMBERED, that on the Fourteenth day of April,
in the year of our Lord 1777, the aforesaid Colin Mackenzie came before
our said Lord the King in His Chancery, and acknowledged the Specifi-
cation aforesaid, and all and every thing therein contained and specified, in
form above written. And also the Specification aforesaid was stampt
according to the tenor of the Statute made in the sixth year of the reign of
the late King and Queen Wm and Mary of England, & so forth.
Inrolled the Fourteenth day of April, in the year of our Lord One
thousand seven hundred and seventy-seven.