A VEN- TILATOR UPON A NEW OR IMPROVED CONSTRUCTION, FOR THE PURPOSE OF VENTILATING TENTS AND MARQUEES
Year: 1805

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
COLLINS, Lieutenant in Ilis Majesty's Royal Corps of Marines, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by Ilis
Letters Patent under the Great Seal of Ilis United Kingdom of Great Britain
and Ireland, bearing date at Westminster the Twentieth day of June, in the
forty-fifth year of His reign, give and grant unto me, the said William Collins,
my exors, admors, and assigns, His especial licence, that I, the said William
Collins, my exors, adiñors, and assigns, during the term of years therein men-
tioned, should and lawfully might make, use, exercise, and vend, within Eng-
land, Wales, and the Town of Berwick-upon-Tweed, my Invention of "A VEN-
TILATOR UPON A NEW OR IMPROVED CONSTRUCTION, FOR THE PURPOSE OF VENTILATING
TENTS AND MARQUEES," in which said Letters Patent there is contained a proviso
obliging me, the said William Collins, by an instrument in writing under my
hand and seal, to cause a particular description of the nature of my said Inven-
tion, 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.
NOW KNOW YE, that in compliance with the said proviso, I, the said
William Collins, do hereby declare that my said Invention is described and
ascertained in manner following, that is to say :-
I take a strong cylinder, or I take a strong tube, of any shape or form, made
of metal or any other fit material, about four or more inches long, and about
two or more inches in diameter, in the sides whereof I make three (more or
less) oval, oblong, or any other shaped perforations or apertures of any con-

page_text: venient length, so as to admit the air freely to pass through, and at the lower-
most edge thereof I make several holes for the purpose of admitting screws,
by which means I fix or fasten the ventilator upon the polo or poles of the
marquee or tent; and in order that the part of the ventilator already described
may be so placed as to appear and be seen sufficiently within the tent or
marquee, as that the air may pass freely through the openings or apertures
thereof, I join or unite in the usual way a yet smaller cylinder or tube of
about one or more inches long, and about one inch diameter, on to the top
of the large cylinder or tube, according to the size and shape thereof, thereby
forming a shoulder or rest upon which I lay or rest the ridge pole of the tent
or marquee, the shoulder previously having a hole or aperture made therein
capable of receiving it, but which smaller cylinder or tube, if the tent be
round, I cause to pass through the centre thereof. It will appear obvious
that the warm air being much lighter will of course be buoyed up by the cool
air, and readily make its escape through the perforations or apertures in the
ventilator, and thereby a constant circulation of fresh air will be kept up; and
it will likewise appear obvious that ventilators may be varied in their construc-
tions on the same principle, so as to answer the intended purpose, and I do vary
the construction thereof according to circumstances; but the aforesaid descrip-
tion I conceive fully sufficient to instruct every intelligent workman in the
mode and manner of constructing or making ventilators for ventilating tents
and marquees, and how to perform the same.
In witness whereof, I, the said William Collins, have hereunto set my
hand and seal, this Twentieth day of July, in the year of our Lord
One thousand eight hundred and five.