IMPROVEMENTS IN STEAM SUPERHEATERS.
Year: 1875

page_text: LETTERS PATENT to William Lec Powleson, of San Francisco, in the
State of California, United States of America, for the Invention of
"IMPROVEMENTS IN STEAM SUPERHEATERS.
"
COMPLETE SPECIFICATION filed by the said William Lee Powleson
at the Office of the Commissioners of Patents, with his Petition®
and Declaration, on the 17th July 1875, pursuant to the 9th
Section of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
LEE POWLESON, of San Francisco, in the State of California, United
States of America, send greeting.
•
WHEREAS I am in possession of an Invention for " IMPROVEMENTS
In Steam SuperheATERS," and have petitioned Her Majesty to grant unto
mc, my executors, administrators, and assigns, Her Royal Letters.Patent

page_text: for the same, and have made solemn Declaration that I am the true and
first Inventor thercof.
NOW KNOW YE, that I, the said William Lee Powleson, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement :-
In the accompanying Drawing Figure 1 is a longitudinal sectional
elevation, showing the interior construction of the superheater; Figure 2
is a longitudinal sectional plan of the same; Figure 3 is a side elevation,
showing the external appearance of the same.
A represents the outside or case; B and C represent division par-
titions; D represents the intromitted supply and temporing or equalizing
pipe; E represents the discharge pipe for superheated steam.
The following is the construction and operation of the same:-The
outside casc A, with the partitions B and C of cast metal, are made in
the usual way. The pipe D is of wrought iron, and is placed in the core
when it is formed. The steam passing in at F (through the pipe D) is
conveyed through the whole of the steam chamber, passing arround the
partitions (B and C), and back through the lower part of the partitions B
to the first division, where it is discharged into the chamber, and again
passes arround the partitions B and O until it reaches the discharge
pipe E, which is designed to connect with a pipe leading to the boiler
furnace. The superheater thus described is designed to be placed in tho
hottest part of the fire or boiler furnace. The steam from the dome of
an ordinary boiler is conducted through a pipe connecting with the
pipe D at F, whence it passes into the heaten chamber, and being
confined in the pipe D it does not come in contact with the outer caso
of the heater until having passed the whole length of the heater, and
become highly heated By this arrangement the superheater may be
heated much hotter without injury, and without danger of unequal
expansion of the metal, and consequently a much greater heat may be
imparted to the steam; should it not be sufficiently retarded in passing
through the steam chamber the number of partitions and other obstruc-
tions may be increased so as to more thoroughly break and deflect the
current.

page_text: Having thus described my Invention (what I claim and desire to
secure by Letters Patent is, the superheater composed of the case A, the
partitions B and C, and pipe D, when constructed and operated for the
purpose of superheating steam substantially as set forth.)
WILLIAM LEE POWLESON. (L.S.)