AN IMPROVED VENTILATING LOUVER CAP OR COWL
Year: 1876

page_text: LETTERS PATENT to Thomas Lloyd, of Winchester, in the County of Hants,
for the Invention of "AN IMPROVED VENTILATING LOUVER CAP OR COWL."
PROVISIONAL SPECIFICATION left by the said Thomas Lloyd at the Office
of the Commissioners of Patents on the 23rd August 1876.
THOMAS LLOYD, of Winchester, in the County of Hants.
VENTILATING LOUVER CAP OR COWL."
"AN IMPROVED
The improvements relate to cowls intended more particularly for ventilating
purposes, and consist in forming the side or sides of louvers round an inner shaft,
and leaving passage ways 1ound near the top of the cap and under a cap plate, also
in furnishing a metal perforated diaphragm to the inner shaft.
The Invention can be performed by making the cowl and its louvers, shaft, and
passage ways, of metal, or other convenient material, and the sizes and shapes of
the various parts may be varied as desired.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Lloyd in the Great Seal Patent Office on the 22nd February
1877.
THOMAS LLOYD, of Winchester, in the County of Hants.
VENTILATING LOUVER CAP OR COWL."
"
AN IMPROVED
The improvements relate to cowls intended more particularly for ventilating
purposes, though they are also to bo applied to chimnies, and consist in forming the side
or sides of two or more louvers round and above an inner shaft, and leaving passage
way round near the top of the cap and under a cap plate, also in furnishing a
perforated diaphragm to or over the inner shaft.
The Invention can be performed by making the cowl and its louvers, shaft, and
passage ways, of metal or other convenient inaterial, and the sizes and shapes of
the various parts may be varied as desired.
The accompanying Drawing will serve as an illustration of a mode of performing

page_text: the Invention, and shows a convenient form of cowl constructed according to my
improvements, Fig 1 being an elevation; Fig. 2, a section; and Fig. 3, a plan
view thereof.
The perforated diaphragm A is shown placed within the inner shaft B, but it
may in some cases be placed at top of the inner shaft B and hollowed up; this
modo of placing the diaphragm I prefer when the cowl is used to ventilate railway
carriages, as the dust is arrested and the movement of the carriage serves to
disperse it. I also modify the cowl when intended for use for ventilating buildings
by making only 2 louver openings C instead of 3, and lowering the position of the
upper rim D to a point about E.
I would observe that by the use of my improved cowl buildings can be well
ventilated, either under ceiling or from floor level; and in some cases by means of
suitable pipes a lower or side room may be ventilated by pipes conducted through
upper or adjoining rooms, in fact every room as well as the drains of houses may
be ventilated by one or more of my cowls of sufficient capacity fixed on the roof,
or elsewhere, and connected with suitable pipes. The cowl without the diaphragm
prevents smoke passing down in chimnies.
In witness whereof, I, the said Thomas Lloyd, have hereunto set my hand and
seal, this Twentieth day of February, in the year of our Lord One thousand
eight hundred and seventy-seven.

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