AN IMPROVED VENTILATOR
Year: 1850

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALFRED
WILSON, of 37, Myddleton Street, Clerkenwell, in the County of Middlesex,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent under the Great Seal of the United Kingdom of Great Britain
and Ireland, bearing date at Westminster, the Twenty-third day of March,
in the thirteenth year of Her reign, did give and grant unto me, the said
Alfred Wilson, my exors, adñiors, and assigns, Her especial licence, full
power, sole privilege and authority, that I, the said Alfred Wilson, my exors,
admiors, and assigns, or such others as I, the said Alfred Wilson, my exors,
admors, or assigns, should 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 my Invention of
"AN IMPROVED VENTILATOR" within that part of Her said Majesty's United
Kingdom of Great Britain and Ireland called England, Her Dominion of
Wales, and Town of Berwick-upon-Tweed; in which said Letters Patent
there is contained a proviso requiring that I, the said Alfred Wilson, should
particularly describe and ascertain the nature of my said Invention, and in
what manner the same is to be performed, by an instrument in writing
under my hand and seal, and cause the same to be enrolled in Her said
Majesty's High Court of Chancery within six calendar months, next and

page_text: immediately after the date of the said in part recited Letters Patent, as,
reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Alfred Wilson, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, are particularly described
and ascertained in and by this present Instrument, reference being had to the
accompanying Drawing hereunto belonging and forming part thereof, that is
to say :-
My Invention has reference to that description of ventilator which is composed
of a series of flat strips or pieces of glass, metal, wood, or other suitable
material, placed over each other in the manner of what are ordinarily known as
loover or luffer boards, and which is provided with the means of altering the
angle at which the several loovers are placed, so as to regulate or entirely
close the passage for air, and consists in so constructing ventilators of the
class above mentioned, that the several loovers may be actuated by a series of
levers whose fulcra or centres of motion are placed between the weight and
the power, and so as to cause the several loovers to open out of or away from
the frame in which they work.
The manner in which my Invention is to be performed I will now illustrate
by reference to the Drawing before mentioned.
Figure 1 is a front elevation of a portion of a sash frame, having my
improved ventilator adapted thereto, the view shewing the ventilator in a
closed position, and as seen from the interior of an apartment.
Figure 2 is a transverse vertical section through the line Z, Z, in
Figure 1.
Figure 3 is a corresponding section, shewing the ventilator open.
Figure 4, a front elevation viewed from the exterior, shewing a ventilator,
constructed according to my Invention, in an open position.
Figure 5 is a transverse vertical section through the line Y, Y, in
Figure 4.
Similar letters of reference are used to denote corresponding portions
in the several Figures. a is an ordinary window sash. b, the metal frame of
the ventilator, which is screwed to the bars of the sash; c, c, glass plates or
loovers, fixed in grooves or clips made for their reception on the lever pieces
d, d, and e, e.
The construction of the pieces d, d, is shewn in three corresponding detached
views of one of such pieces, vizt, Figures 6, 7, and 8, being plan, side, and
edge views respectively. Figure 9 exemplifies, in a view corresponding with
Figure 7, the construction of the pieces c, e. These two series of levers or

page_text: pieces are rivetted to the opposite sides of the frame b, so that they may turn
upon the said rivets as fulcra or centres of motion, and these centres are
placed so that they may be in or nearly in a line with the top edges of the
loovers. The centres of the levers d, d, are likewise placed between the ends
by which they are worked, and the loovers supported by their opposite ends.
f is a connecting rod rivetted by small loose rivets to the tails or tops of the
several levers d, d, for the purpose of simultaneously moving the several
loovers. This rod extends downwards to any convenient length, and at or near
the bottom is kept in position by a guide piece g, and is formed into or
furnished with a handle fx. It has likewise a catch which acts against the
rack h, which is fixed to the sash bar so that, according to the position of the
rod with regard to this rack, the loovers may be maintained at the required
angle. On releasing the rod from the rack, against which it is made so as to
spring or press, the weight of the loovers will close the ventilator, or if this
should prove insufficient the rod may be forced upwards. To effect this object,
the connecting rod may be furnished with a knob or button (as shewn at i)
for actuating it instead of the handle f*; or instead of this the tail or top of
one of the levers d, d, may be lengthened, as shewn at Figure 10, for con-
necting a wire or cord for giving motion to the loovers.
In witness whereof, I, the said Alfred Wilson, have hereunto set my
band and seal, this Twenty-first day of September, in the year of our
Lord One thousand eight hundred and co