IMPROVEMENTS IN THE CONSTRUCTION OF STEAM BOILERS
Year: 1884

page_text: I JOSEPH WHITLEY of Hunslet Road Leeds in the County of York Founder
and Engineer do hereby declare the nature of my Invention for IMPROVEMENTS IN
THE CONSTRUCTION OF STEAM BOILERS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
Whereas steam Boiler shells have hitherto been made of plates rivetted together
and of an even thickness The object of my Invention is to construct Boiler shells
in sections and without rivets each section being thicker than the one preceeding it
when counting the sections from the ends to the centre the said sections being
hooped at the respective junctions By this mode of construction the increase of
strain upon a Boiler shell in the middle as the pressure of steam rises is counter-
acted by the extra thickness in the section aided by the reduction of the area of
the thicker shells I also form by preference the respective sections of a slightly
conic form in the interior from the ends of the total shell to the centre section or
sections so that the total shell excepting the central part or parts constitute two
cones formed of duplicate parts or the cones proper may be made in two parts
whose bases form the ends of the total shell before the elliptic or other ends are
attached. In the construction of this class of boiler shells I insert by preference
elliptic ends with radial bosses upon them for bracing the whole together. These
Boilers I make in Steel Iron and Bronze and such Boilers are far superior to those
made on the joint and rivet principle and weight for weight will stand far higher
pressures than Boilers hitlierto made. When I begin to form one of my improved
Boilers by preference I cast a short tubular section of any required thickness and
diameter having outer projections at the ends and then when required for very
bigh pressure I roll the same in rollers specially adapted to the respective
diameters of the shells and the breadths of the projections upon the outer surface
at the junction ends to increase the density and tensile strength or I form a hoop
or shell by punching or boring the centre out of a use or block and then roll it
to the required particulars as before described and face the ends and outer
projecting surface and having formed proper hoops I contract force or press them
into their respective positions upon the shell joints and so form the length required
I cast or press the ends and bore and face the radial bosses to receive the bolts
and nuts with which I secure the whole of the sections and ends together and
when cold I give the hoops a slight caulking to complete the boiler.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performned I declare that what I
claim is:-
First. The construction of Boiler Shells from short sectional parts each part
increasing in thickness substantially as herein before described.
Second. The construction of Boiler Shells from short sections having a conic
interior and an increasing thickness substantially as herein before described.
Third. The construction of sectional Boiler shells formed in steel Iron or Bronze
and rolled substantially as hereinfore described.