DIRECTING HEAD FOR DOWN- CAST VENTILATING SHAFTS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, SAMPSON LOW, Junior, BA Cantab., of No 41 Mecklenburgh Square in the
county of Middlesex, Sanitary Engineer, Fellow of the Meteorological Society, do
hereby declare the nature of my said invention for "DIRECTING HEAD FOR DOWN-
CAST VENTILATING SHAFTS," to be as follows:-
My invention relates to the construction of a directing head for down-cast
ventilating shafts in such manner that wind blowing across the stationary head or
the current of air produced by the passage of the head through the air, when it is
on a moving vehicle or vessel, shall always cause a current to flow down the shaft,
the head serving at the same time effectually to prevent entrance of rain or water
into the shaft. The accompanying diagram shews in section the construction
which I adopt for this purpose. S being the down-cast shaft or tube, I fix on it
the head consisting of the following members:-a dome A B C which is a segment
of a hollow sphere greater than a hemisphere, practically about 3/4ths of the
sphere-curved guides D E on the exterior of the shaft, and curved baffles F G
within the dome. A current of air directed against the head, on any side of it, is
deflected upwards by the guides D E, and downwards by the baffles F G, as
indicated by the arrows, and thus there is caused a powerful current down the
shaft or tube S, which, at the same time, is quite protected by the dome against
entrance of rain or water.
The head may be applied to the downcast-shaft or tube of a ship ventilator or to
tubes for supplying fresh air to railway carriages or other vehicles. It may also
be used, when there is wind, to produce an ejector current, for driving foul gases
out of sewers and other structures.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: COMPLETE SPECIFICATION..
I, SAMPSON Low Junior BA Cantab of 41, Mecklenburgh Square, in the
county of Middlesex, Fellow of the Royal Meteorological Society do hereby declare
the nature of my invention for DIRECTING HEAD FOR DOWNCAST VENTILATING
SHAFTS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
My invention relates to the construction of a directing head for Downcast
Ventilating Shafts in such a manner that the wind blowing across the stationary
head, or the current of air produced by the passage of the Head through the air
(when on a vessel or other vehicle) shall always cause a current to flow down the
shaft to which the said head is fixed.
I fix on a tube, or shaft, the head, consisting of the following members.
1 A dome shaped chamber, or cylindrical box.
2 Curved guides, on the exterior of the shaft & connecting such shaft to the
aforesaid chamber or box.
3 Curved baffle plates within the aforesaid chamber, connecting such with the
shaft, which latter the said baffle plates divide into equal partitions. A current of
air, directed against the head, on any side thereof, is deflected into the domeshaped
chamber or cylindrical box, by the guides, and, downwards, into the shaft, by the
baffle plates, as indicated, by the arrows in the drawing annexed hereunto.
Thus there is caused a current down the shaft, to which the said invention may
be fixed: the angle at which both dome shaped chamber (or cylindrical box) and
guides are relatively applied to such shaft, as is integral part of my invention,
preventing the entrance of rain or water.
This my invention may be applied to any downcast shaft, or tube, supplying
fresh air to any ships, railway carriages, or other vehicles. It may also be applied
to produce a current of air in sewers, house-drains, tunnels magazines & other
structures.
Having now particularly described, and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1 Placing a dome shaped chamber (or cylindrical box) over a tube or shaft &
connecting it thereto by suitable wind guides & baffle plates, in such a manner as
to induce à ventilating current down any shaft to which the said invention may
be applied, after the manner hereinbefore at length set forth."
2 At the same time, excluding, by roason of the construction of my said
invention the entrance of water or rain.
1
ידנית