Improvements in the Manufacture of Articles from Mica, Talc, and the like.
Year: 1894

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Articles from Mica, Talc, and
the like.
I, DAVID JAROSLAW, of 16, Water Lane, Great Tower Street, in the City of
London, Merchant, 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 :-
My invention relates to the manufacture of articles, such as lamp chimneys,
from mica, talc or like material.
Hitherto in manufacturing articles from such materials it has been the practice
to overlap the edges of the sheets of material to be connected. Now the object of
my invention is to connect the said sheets without the necessity of overlapping,
thereby effecting a considerable economy of material which is of importance as
the size of the sheets is limited. To this end I make use of a channelled connecting
strip as hereinafter more particularly described.
To enable my invention to be fully understood I will for the purpose of
illustration describe the same as applied to the manufacture of Argand lamp
chimneys by reference to the accompanying drawing, in which :-
Figure 1 is an elevation of such a lamp chimney; and,
Figure 2 is a vertical section of the same:
Figure 3 is a horizontal section on the line 3-3 Figure 1 ; and,
Figure 4 is a section drawn to an enlarged scale shewing the construction of my
connecting strip and the mode of applying the sheets of material to be connected
thereto.
a is my connecting strip which, as shewn, is composed of a piece of sheet metal
bent so as to form two grooves or channels b, b into which the adjacent edges of
two sheets c, c of mica or like material to be connected are introduced.
In practice the grooves b, b are made slightly larger than is necessary in order
that the sheets of mica may be readily introduced into the same, the metal being
afterwards pinched or closed upon the sheets so as to retain them firmly. If
desired rivets may be passed through the edges of the connecting strips and the
sheets so as to securely hold the latter.
The chimney shewn in the drawing is represented as being composed of two
semi-cylindrical pieces of mica having their adjacent edges connected by the
connecting strips hereinbefore described, channelled sheet metal hoops d, d being
placed over the upper and lower edges of the chimney in order to protect the same.
It is to be understood, however, that more than two pieces of material may be used
in making a chimney and that my connecting strips may be used for uniting
pieces of mica or like material for other purposes.
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 :-
1. In the manufacture of articles from mica, talc or the like, uniting the several
pieces of material necessary to form the article by means of double channelled
connecting strips into the grooves or channels of which the edges to be connected
are introduced and clipped, substantially as described.

page_text: 2. The manufacture and use of lamp chimneys and other articles of mica, talc
or the like, substantially in the manner hereinbefore described and illustrated in
the accompanying drawing.
Dated the 17th day of September 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.