IMPROVEMENTS IN STEAM AND OTHER TURBINES
Year: 1876

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN
STEAM AND OTHER TURBINES." A communication from abroad by Jean Hippolyte
Dufort, of Paris, France.
Sealed the 21st November 1876, and dated the 6th June 1876.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 6th June 1876.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
"IMPROVEMENTS IN STEAM AND OTHER TURBINES.'
This Invention relates to an improved turbine operated both by the direct impulse
of a jet of steam or compressed air or gas and by reaction by utilizing the expansive
power of the fluid as hereafter described.
The accompanying Drawing represents the improved turbine partly in section to
illustrate its working. The turbine is composed of radial vanes B fixed edgewise
between two discs C. The vanes extend from about the middle of the radius of
the turbine nearly to the circumference where they are deflected almost at right
angles and all in the same direction. The tangential portion of the vancs overlap
one another slightly so as to almost close the intervals between them, as shown.
The turbine is mounted on a shaft A and is enclosed in a casing E.
The steam or other fluid introduced through nozzle F in the direction of arrow
H is directed in the form of a jet against the radial part of the vanes B and passes
between them into the central space where it expands and acts against the series
of inclined surfaces presented by the tangential portion of the vanes and drives the
turbine by reaction in escaping into the annular space D between the turbine
and the casing which leads to the outlet G. The combined action of the impulsion
and reaction of the fluid is to rotate the turbine in the direction of the arrow 1.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the 25th
November 1870.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
IMPROVEMENTS IN STEAM AND OTHER TURBINES." A cominunication
"
from abroad by Jean Hippolyte Dufort, of Paris, France.
This Invention relates to a turbine operated both by the direct impulse of a jet
of steam or compressed air or gas impinging against the vanes successively, and by
the expansive power of the fluid reacting against the vanes simultaneously as here-
in-after described.
The accompanying Drawing represents the turbine partly in section to illustrate
its working. The turbine is composed of radial vanes B fixed edgewise between
two discs C. The vanes extend from about the middle of the radius of the turbine
nearly to the circumference where they are deflected almost at right angles, aud all
in the same direction. The tangential portion of each vane extends to the circum-
ference of the wheel and passes just beyond the point where if its radial portion
were prolonged the next vane would meet the circumference. The vanes thus
overlap one another slightly so as to almost close the passages between them, as
shown. The turbine is mounted on a shaft A, and is enclosed in a casing E.
The steam or other fluid introduced through nozzle in the direction of arrow
H, is directed in the form of a jet against the vanes B and passes between them
into the central space where it expands and reacts against the circumference of
inclined surfaces presented by the tangential portion of the vanes in escaping into
the annular space D between the turbine and the casing which leads to the outlet C.
The combined action of the impulse and the reaction of the fluid is to rotate the
turbine in the direction of the arrow 11.
Having described the nature of the said Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is, the improved turbine herein shown
and described, operated by the combined impulse of a jet of steam, compressed
air, or gas, and of the expansive power of the fluid reacting as specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set my
hand and seal, this Twenty-fourth day of November, in the year of our Lord
One thousand eight hundred and seventy-six.