An Improved Hot Air Motor.
Year: 1892

page_text: Date of Application, 10th Sept., 1892
Complete Specification Left, 5th June, 1893-Accepted, 8th July, 1893
An Improved Hot Air Motor.
I, OTTO SPAETHE trading under the style of Wilhelm Spacthe of Gera, Reuss,
in the German Empire, Musical Instrument Manufacturer, do hereby declare the
nature of this invention to be as follows:
This invention relates to a hot air motor more especially designed for small
power such as is required for working mechanical musical instruments, sewing
machines, etcetera.
The invention consists-supposing the hot air cylinder to be vertical-in con-
structing the upper part of the hot air cylinder with ribs projecting therefrom for
the purpose of causing a radiation of the heat instead of employing a current of air or
water as is usually the case. By means of this construction the upper part of the
hot air cylinder is kept comparatively cool the air being drawn therefrom and
expelled into the atmosphere by a pump.
Dated this 10th day of September 1892.
THOMAS R. SHILLITO,
89, Chancery Lane, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improved Hot Air Motor.
I, OTTO SPAETHE, trading under the style of Wilhelm Spaethe of Gera, Reuss,
in the German Empire, Musical Instrument Manufacturer, 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 :-
This invention relates to a hot air motor which is more especially designed for
small power or domestic use, such for instance as the driving of mechanically
played musical instruments, sewing machines, etcetera. The invention consists in
constructing the upper part or outer end of the hot air cylinder with ribs projecting
therefrom for the purpose of causing a radiation of the heat from that part of the
hot air cylinder instead of employing a current of air or water as is frequently
done. By means of this construction the upper part of the hot air cylinder is kept
comparatively and sufficiently cool, the air also being drawn therefrom and cooled
by the cold air or working cylinder.
In the drawing
Figs. 1, 2, 3, are respectively a vertical section, an elevation, and a plan of so
much of a hot air motor as is necessary to illustrate the invention.
a is the upper part of the hot air cylinder, b ribs projecting therefrom in any
convenient and sufficient number, a the cold air or working cylinder driven from
the same shaft as that with which the piston rod d of the hot air cylinder is in
connection.
The cold air cylinder c may also be located at a greater distance from the hot
air cylinder if desired and in connection therewith by a corresponding length of
pipe. e is a lamp by which the hot air cylinder is heated and the motor thereby
driven.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
In hot air motors of the kind referred to, the construction of the upper or outer

page_text: end of the hot air cylinder with projecting ribs, for the purpose specified,
substantially as described and shewn.
Dated this 5th day of June 1893.
THOMAS R. SHILLITO,
89, Chancery Lane, London, W.C., Agent for the Applicant.