IMPROVEMENTS IN THE MEANS EMPLOYED FOR FILTERING THE AIR, AND PREVENTING DUST AND OTHER FOREIGN MATTER FROM PASSING INTO ROOMS OR APARTMENTS VENTILATED ON THE 'TOBIN' AND OTHER PRINCIPLES
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Anthony Robinson Harding and
Joseph William Harding at the Office of the Commissioners of Patents on
the 7th June 1878.
ANTHONY ROBINSON HARDING and JOSEPH WILLIAM HARDING, both of Leeds,
in the County of York. "IMPROVEMENTS IN THE MEANS EMPLOYED FOR FILTERING
THE AIR, AND PREVENTING DUST AND OTHER FOREIGN MATTER FROM PASSING
INTO ROOMS OR APARTMENTS VENTILATED ON THE 'TOBIN' AND OTHER PRINCIPLES."
The object of our Invention is to render the air that passes into the room or
apartment either through what is known as the "Tobin" tube system of ventilation,
or other air passages free from dust or other foreign matter.
"
The mode of applying our improvements to the well-known "Tobin tube
system is as hereafter described.
Hitherto several schemes have been attempted for preventing dust and other
foreign matter entering the apartment in which the above system has been applied,
such dust or other foreign matter passing into the room or apartment in com-
bination with the atmospheric air. In order to prevent this we provide a frame,
having stretched within it or on it to a convenient tightness canvas or other
suitable material. This frame, instead of being placed in or on the tube horizontally,
we fix in a diagonal direction, and by preference though not necessarily resting at
or near the bottom of the tube on one side and extended to and supported on the
opposite side of the tube at or near the top. By this means a large area of canvas
or other porous material can be employed instead of the very small area of the
same material that can be used when placed in a horizontal position either on or in
the tube.
The angle of the filtering medium of canvas or other substance may be varied in
accordance with the size of tube or the amount of air required to pass through it,
and in some cases the canvas or other suitable material may be secured in a diagonal
direction within the tube without the assistance of a frame.

page_text: Another arrangement which may be used within the tube in combination with
or independent of the above described is as follows:-We provide at the bottom of
the tube a tank or reservoir for the reception of water or other liquid, and place
above this tank within the tube a number of projections or partitions at suitable
angles and distances apart. These projections or partitions direct the air as it
rushes through the tube on to the water or other liquid in the tank. By this
means the dust or other foreign matter is brought in contact with the water or
other liquid, and is thereby prevented from passing through the tube.
A similar arrangement of canvas or other porous material (by placing it in a
diagonal direction) may be used in other air passages without impeding, except as
far as is necessary, the rush of air.
Also the reservoir for water with projecting parts or partitions may also be
applied in other ventilating passages, either separately or combined, with the above
filter of canvas or other suitable material, and by such arrangements dust or other
foreign matter can be entirely prevented from passing into rooms or apartments.