IMPROVEMENTS IN APPARATUS FOR EXHAUSTING GAS, AND APPLICABLE FOR INDUCING CURRENTS OF VARIOUS FLUID OR PULVERISED OR GRANULAR MATTERS
Year: 1876

page_text: PROVISIONAL SPECIFICATION left by George Robertson at the Office of the
Commissioners of Patents on the 5th August 1876.
GEORGE ROBERTSON, of Fenchurch Street, in the City of London, Engineer.
"IMPROVEMENTS IN APPARATUS FOR EXHAUSTING GAS, AND APPLICABLE FOR
INDUCING CURRENTS OF VARIOUS FLUID OR PULVERISED OR GRANULAR MATTERS."
This Invention relates to improved apparatus which has been specially designed
for exhausting gas from retorts by means of a jet or jets of steam, but which is
also applicable for inducing currents of various fluid, or pulverised, or granular
matters.
One object of the Invention is to obtain a simple and simultaneous adjustment
where the steam or other motive fluid combines with the gas or other matter to be
exhausted or moved in a gradual manner, or at two or more successive stages.
In one modification of the improved apparatus the orifices for the steam jets are
in an annular form, encircling the pipe or passage through which the gas bas to be
exhausted, and the adjustment of these orifices is effected by means of a single
intermediate piece forming a short length of pipe between them. One end of the
intermediate piece is screwed into a box fixed on the end of the pipe by which the
gas enters the apparatus, and this box has a steam pipe connected to it, and is
formed with an annular channel by which the steam has access to the annular
orifice. This orifice is between a nozzle formed in the box and entering into the
end of the intermediate piece, which is formed with a conical or funnel throat, so
that the orifice is enlarged or diminished accordingly as the piece is screwed out of
or into the box. The other end of the intermediate piece is screwed into a second
box fixed on the continuation pipe, and having a second steam pipe connected to it;
and in this case the nozzle is formed on the end of the intermediate piece, and the
conical throat in the box. The intermediate piece has right-hand and left-hand
screw threads at its opposite ends, and is adjusted by turning it by means of a
hand wheel fixed on it, the one movement opening or closing both orifices equally
and simultaneously.
In another modification of the improved apparatus the steam or other motive
fluid is admitted through a small nozzle, having a conical regulating plug at the
centre of the smaller end of a tapering or slightly coned induction piece fitted in a
cylinder or box into which the gas or other matter to be operated on is led by a

page_text: side pipe, the larger end of the induction piece being connected to the continuation
or discharge pipe. The induction piece is formed with one or more slits or orifices
passing helically round it from one end to the other, and giving access for the gas
or other matters to reach the steam jet in a gradual manner. The parts forming
the induction tube may be made adjustable, so that the width of the helical slit or 5
slits can be increased or diminished, and they are, by preference, shaped so as to
give a forward direction to the entering fluid or matters, and so that the back edge
projects inwards and forwards a little beyond the forward edge.