Compressed Air.
Year: 1887

page_text: Compressed Air.
We RICHARD EDWARD DONOVAN of 7 Ormond Road Gentleman, FRANCIS
HAZLETT of 1 O'Connel Avenue Accountant and JAMES JOHNSTON of 50 Fleet Street,
Merchant, all in the County of Dublin Ireland do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :—
According to the method at present employed in the process of blowing glass the
melted material is taken from the furnace on the end of a hollow rod or tube through
which the operator blows air from the mouth thereby causing the bulb of molten
material to expand to the extent required for the article to be produced.
This method is admittedly an injurious one for the operator, and our invention is
designed to supersede the same, and otherwise to improve, facilitate and cheapen the
manufacture of Glass.
To this end we propose to construct a suitable apparatus as hereinafter described so
as to form a part of the ordinary blow pipe or tube in which apparatus we condense
the air, or we may charge the said apparatus with air previously condensed.
The apparatus herein referred to consists of a suitable chamber attached to the
ordinary blow pipe or tube connected with which is an ordinary air pump whereby
the chamber may be charged with condensed air which is allowed to flow through the
iube or pipe as required by operating a suitably arranged valve.
When condensed air is introduced to the chamber from an external source the air
pump may be dispensed with and the chamber alone can he utilized for the purpose
in view.
In order that our said invention may be more readily understood and applied in
practice we will describe the accompanying Drawings. Fig. I is an elevation and
Fig. 2 a vertical cross section showing the arrangement and construction of apparatus
which we prefer to use in carrying out our invention; a represents the ordinary blow
pipe or tube, the chamber for holding the condensed air, c the cylinder in which
works the piston d, attached to the plunger e. By working this plunger the air is

page_text: condensed in the chamber to the extent required on the principle of the ordinary air
pump and when sufficiently charged the apparatus is ready for use; is the valve by
the operation of which the condensed air is allowed to flow at pleasure through the
pipe or tube is an ordinary valve introduced for the purpose of allowing the air to
escape when necessary.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed we would have it understood that we
are aware that Patents have been taken out for certain methods of Blowing Glass by
compressed Air and to such methods we lay no general claim, but what we assert our
invention to be, and what we claim is
Ist. In the process of blowing glass the combination formed by the chamber b, and
the pipe or tube a used with or without the air pump in the manner substantially as
herein specified and set forth.
2nd. The use and application in the process of blowing glass of a portable apparatus
arranged constructed and operated in the manner substantially as herein described and
set forth.
J. K. FAHIE & SON,
10, Leinster Street, Dublin,
Agents for Applicants.