Improvements in and relating to Steam Coffee Boilers.
Year: 1890

page_text: Date of Application, 15th Nov., 1890-Accepted, 20th Dec.. 1890
COMPLETE SPECIFICATION.
Improvements in and relating to Steam Coffee Boilers.
I, DAVID ROBERTSON, of Sauchiehall Street, Glasgow, Lanarkshire, Ironmonger, do
hereby declare the nature of my invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement in writing, reference being had to the accompanying sheet of drawings,
and to the letters and figures marked thereon, that is to say:
My invention has reference to and comprises a new or improved construction, or
arrangement and combination of the parts of a portable steam coffee boiler, acting on
the principle of the "Napier" coffee machine or boiler; and which will make such
machines easier handled and more convenient than as heretofore constructed and
used.
And in order that my said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto appended
an explanatory sheet of drawings in which"
Figure 1 represents an elevation of a coffee boiler or machine with its steam heating
vessel resting on the ring frame, and with spirit heating lamp below, and its mixing
and filtering vessel and rose and siphon partly in section resting on the portable bed
frame or base stand; and
Figure 2 is a plan view corresponding to Figure 1.
Referring to these drawings; the improvements consist in constructing the portable
base stand A of wood, preferably of rectangular horizontal shape with moulded
ornamental edges resting on feet or balls at the corners, and having an angular sunk
recess at A preferably with metallic case in it for an ordinary form of wick
spirit heating lamp L to rest in, to save the breakages in the porcelain basements
heretofore used.
Another improvement consists in forming the brass or metal fixed horizontal ring
frame B, B', which is carried on the vertical standard B³ fixed in the sole frame A of
an annular segmental ring shape at the part B which carries the angular ball heating
vessel C, that is, with a slit or part cut away at 6 in the outer end or at one
side.
A further improvement consists in fitting the heating vessel C, which is of a
ball shape placed at an angle and may be of glass, porcelain, or copper electro-
plated, with a drawing off socket C and tap or cock c at its bottom or lower part,
projecting out through or below the slit in the ring B, so as to decant the coffee
when ready without requiring to tilt or move the vessel C as heretofore.
The ring B in the frame B, B', is the same as usual wide enough to retain the
mixing, boiling, and filtering vessel D, which is much of a usual shape set on the
opposite side of the wood sole A to the spirit lamp L and heating vessel C. The neck
of the heating and receiving angled ball vessel Crests in a close bow B³ in the upper
nd of the standard B2, which also answers for lifting and carrying the apparatus
ortably by, and the siphon pipe c¹ from the cork stopper of the angled ball vessel C,
asses down to the fixed on portable rose or strainer e² secured on its lower end
hrough a slot d'in an ornamental thin embossed inetal lid d, preferably made of sheet
opper or brass and electro-plated, fitted on the open top of the boiler and mixer D,
hich prevents the steam rising into the apartment from the boiler. The action of
is apparatus is as usual, the ground coffee is placed in the bottom of the boiler and
ixer D with the desired quantity of water in it; and a sufficient quantity of water
placed in the angled ball vessel C to be heated by the spirit lamp L till boiling, and
carried in the form of steam through the pipe c and rose to boil the water and
ffee in the boiler D until nearly all the water is boiled over, when a vacuum
stantly takes place in the vessel C by the condensing of the steam in it by the
[Price 6d.

page_text: atmosphere, on the removal of the spirit lamp L, so that the pure liquid coffee boiled
in the vessel D is forced through the rose filter c² and pipe c¹ to the angled ball
vessel C, from which it can be drawn off as required by the new tap c, and kept warm
by the lamp L without decanting the globe vessel C.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
First. The construction or arrangement and combination of the parts of a steam
coffee boiler or machine of the "Napier" type with wooden base frame, and liquid
drawing off tap in angled ball vessel, and improved fittings, substantially as herein
described in reference to and shown in the accompanying drawings.
Second. The construction and use of a wooden base frame to carry a coffee boiler
of the "Napier" type, substantially as herein described in reference to and shown in
the accompanying drawings.
Third. In a coffee boiler of the "Napier" type the construction and use of a
drawing off liquid tap or cock in the angled ball vessel, substantially as and for
the purposes herein described in reference to and shown in the accompanying
drawings.
Fourth. In a coffee boiler, of the "Napier" type the cutting out or forming of the
ring frame B carrying the angle ball vessel C with a slit or open part substantially
as and for the purposes herein described in reference to and shown in the accom-
panying drawings.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COT 10T MIT
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