IMPROVEMENTS IN STEAM-BOILERS.
Year: 1880

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for an Invention
of "IMPROVEMENTS IN STEAM-BOILERS.". A communication from abroad by
Josef Prégardien, of Deutz on the Rhine, Germany.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Ottice of the Commissioners of Patents on the 14th September 1880.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN STEAM-BO11.ERS." [A com-
munication from abroad by Josef Prégardien, of Deutz on the Rhine, Germany.]
This Invention relates to improvements in steam-boilers of that class in which
two or more distinct water chambers or receptacles are employed, the said
chambers being united by water circulating tubes or pipes.
The said Invention consists in providing in addition to the ordinary connecting
tubes a number of small tubes connecting the upper and lower water chambers,
which small tubes may be straight or curved, and which offer a large heating-
surface to the gases or products of combustion passing around and about them,
thus absorbing the heat therefrom and expediting the evaporation and circulation
of the water.
When there are two lower water chambers and one upper one, the small tubos
are placed in an oblique direction.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Robert Lake in the Great Seal Patent Office on the 14th
March 1881.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN STEAM-BOILERS." A com-
munication from abroad by Josef Prégardien, of Deutz on the Rhine, Germany.
This Invention relates to improvements in steam boilers of that class in which
two or more distinct water chambers or receptacles are employed, the said
chambers being united by water circulating tubes or pipes. It is illustrated in the
accompanying Drawing, in which--
Figure 1 shews in longitudinal section a steam boiler consisting of an upper and
a lower chamber or part, and
=
Figure 2 is a transverse section of the same.
Figure 3 is a horizontal soction of one half of the said steam-boiler.
Figures 4 and 5 are transverse sections of modifications of the said boiler
hereinafter described.
A and B are the usual-tubes-connecting the two parts of the boiler. In addition
-to-these-tubes-I_employ a suitable number of small tubes a, b, c, d, e, fg;-these-
tubes which connect the upper and lower water chambers,-and-which_may_be
straight or curved, offer a large heating surface to the gases or products of
combustion passing around and between them and absorb their heat, thus producing
considerable evaporation and circulation of the water.
Figure 4 shews these tubes applied to boilers having two lower water chambers
or receptacles.
Figure 5 shews the said tubes applied to a "Cornish" boiler.
The connecting tubes are made of iron, copper, or brass, and are inserted in the
saine manner as in locomotive boilers and other niultitubular boilers, that is to
say, the holes in. the boiler plates are drilled and then countersunk, the tubes are
then carefully inserted and secured by the aid of a steel mandrel, or steel rings are
driven in as in locomotive boilers.
Having thus fully described the said Invention as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it under-
stood that I claim,-
In a steam boiler of the class or kind, herein specified, the employment of a series
of small tubes, arranged substantially as shewn in the Drawing, for increasing the
heating surface of the said boiler, as above set forth.
In witness whercof, I, the said William Robert Lake, have hereunto set my
hand and seal, this Fourteenth day of March, in the year of our Lord One
thousand eight hundred and eighty one.
WM RORT LAKE. (L.S.)