Semi Portable and Traction Engines.
Year: 1885

page_text: Semi Portable and Traction Engines.
We SYLVANUS EDDINGTON and JOHN EVAN STEEVENSON trading as Eddington
and Steevenson of New Street Iron Works, Chelmsford in the County of Essex
Engineers 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:-
Our Invention relates to an improved lagging or cleading for steam boilers of
portable semi-portable and traction engines. Such lagging or cleading usually
consists of layers of felt or other non-conducting medium, wood ribs, battens and
an outer casing or envelope.
The invention has for its object to provide a lagging or cleading so made as to be
capable of being applied to the boiler as a whole and of being easily removed there-
from either wholly or partially for examination of the boiler and of being replaced
without injury to the lagging.
The invention consists in a lagging constructed of layers of felt or other non-
conducting medium a casing or envelope preferably of sheet iron or steel, distance
pieces or segments, and in some cases battens, all permanently connected together
and applied as hereafter described.
Reference is to be had to the accompanying drawings forming part of this
Specification wherein
Figure 1 shows a segment of a boiler shell and lagging partly lapped around the
same.
Figure 2 shows an inside face view of a portion of the lagging, the felt being
partly broken away.
Figure 3 is a similar view of a slight modification.
Figure 4 shows a modification of figure 3.
Figure 5 is an edge; and Figure 6 a similar face view of another modification
in which the battens are dispensed with.
The same letters of reference indicate the same parts in all the Figures.
Referring to Figures 1. 2. 3. a is the felt or other non-conducting material in one
two or more layers, bare battens (preferably of wood) arranged side by side
transversely of the strip of lagging a sufficient interval being left between the
battens to allow for bending the strip of lagging around the boiler. c is a strip of
sheet iron or steel to form the external covering of the lagging which is nailed or

page_text: otherwise secured to the battens b. dare distance blocks nailed to the battens
(preferably at the ends thereof) and coming against the boiler shell in order to
maintain the battens at the proper distance therefrom These distance blocks may
be made of wood or of papier maché.
The felt is laid on the battens between the rows of distance blocks, and, if of
the whole width of the strip, would have holes cut in it to give free passage to the
distance blocks as shown, the felt being secured to the battens b by nails m.
The lagging thus constructed is flexible and may easily be bent around the
boiler as shown, the several strips or sections being secured in position by the
usual outside metal hoops or bands covering the joints between the sections
or strips.
It will be obvious that by omitting the felt the distance pieces will maintain an
air space between the battens and the shell of the boiler, a more or less efficient
lagging being thus formed without the use of felt.
Figure 3 differs from Figure 2 only in the omission of alternate distance
pieces d.
In Figure 4 the distance pieces d are in the form of segments corresponding in
curvature to the boiler shell and forming, when the lagging is lapped around the
same, complete ribs.
In figures 5 and 6 the battens bare omitted, the distance pieces being secured
by nails or screws, and the felt preferably by cement, directly to the sheet iron
casing. In this case, to compensate for the omission of the battens, additional
distance pieces may be provided at intervals intermediate of the width of the strip,
to afford the necessary support for the casing.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed we declare that
what we claim is
1. A lagging or cleading for the boilers of portable, semi-portable, and traction
engines, constructed of a sheet metal backing or casing, transverse battens, one or
more layers of felt or other fabric, and distance pieces or segments, all permanently
connected together to form a flexible structure or strip capable of being readily
applied and removed, substantially as specified and shown in the drawings.
2. A lagging or cleading for the boilers of portable, semi-portable and traction
engines, constructed of a sheet metal backing or casing, one or more layers of felt
or other nonconducting fabric, and distance pieces; the felt and distance pieces
being attached to the metal backing so as to form a flexible structure, or strip,
capable of being readily applied and removed, substantially as specified and shown
in the drawings.
3. A lagging or cleading for the boilers of portable, semi-portable and traction
engines, constructed of a sheet metal strip, transverse battens affixed thereto, and
distance pieces affixed to the battens to maintain an air space between the battens
and the boiler shell, the whole being permanently connected to form a flexible
structure capable of being readily applied and removed substantially as specified.
1000
SYLVANUS EDDINGTON.
JOHN EVAN STEEVENSON.
By A. M. & Wm Clark,
Patent Agents,
53, Chancery Lane, London.