Year: 1887

page_text: Date of Application, 1st June, 1887
Complete Left, 18th Feb., 1888
Complete Accepted, 23rd Mar., 1888
I WALTER GEOFFREY JACKSON of Loscoe Grange near Normanton West Yorkshire
Mining Engineer do hereby declare the nature of this invention to be as follows:-
My Invention consists of a corrugated metal shield plate which slides down over the
top of the lamp and surrounds the gauze part thereof.
By making the shield corrugated I obtain a better supply of air to feed the flame.
It also allows of such shield being easily fitted to the lamp without necessitating
sending the lamp to the maker to have the bottom ring drilled or perforated as
hitherto as the corrugated form of the shield allows of its readily accommodating
itself to any little irregularities either in the size or shape of the top and bottom rings
of the lamp, and causes it to clip firmly round such rings.
My improved corrugated safety lamp shield combines the advantage of simplicity of
construction with increased utility convenience and adaptability.
ELT & Co.,
33, Southampton Buildings,
Holborn, London,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Shield for Miners' Safety Lamps.
I WALTER GEOFFREY JACKSON of Loscoe Grange near Normanton West Yorkshire
Mining Engineer, 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:
:-
This Invention relates to an improved shield for a miner's safety lamp and has for
its object to facilitate fitting the lamp with a shield and also to render the latter more
useful and convenient than those hitherto employed.
Such improved shield consists of a corrugated cylinder open at both ends and
strengthened internally by a metal band secured thereto by rivets-A slotted link is
rivetted to the top of the cylinder-This link takes over a lug which is rivetted to the
dome plate of the lamp-Such lug is perforated to allow of the shield, when placed
over the lamp, being secured with a lead plug or rivet or by a catch or in any other
convenient manner-The shield is sufficiently deep to extend above and below the top
and bottom rings of the lamp thus entirely covering and effectually protecting the
gauze while the corrugations formed therein ensure a better supply of air to feed the
Hame than has been obtainable with the shields hitherto in use. This is owing to
the fact that each corrugation forms an air duct which induces an air current and
therefore a series of such corrugations afford more space for and create a better
circulation of the air and so promote combustion-Such corrugations also dispense
with all necessity for drilling holes in the lamp itself as heretofore done to permit the.
air to feed the flame-Another advantage of such corrugations is that they impart a
certain degree of flexibility to the shield owing to which it readily accommodates itself
to any little irregularities in the size or shape of the top and bottom rings of the lamp
and clips them firmly and securely. Such corrugations may be arranged either
vertically spirally diagonally or in any other convenient manner-Or the shield may
be made plain in the middle and have a series of corrugations formed around the top
and bottom thereof. Or it may be made in three or more sections rivetted or other-
wise fastened together the top and bottom sections being corrugated and the inter-
mediate section or sections plain-Preferably however I make such corrugations
continuous over the entire surface of the shield.
My improved corrugated shield can be readily fitted to any lamp as in order to do
so it merely requires to be put over the lamp in the ordinary way and slid down until
it completely covers the top or gauze part of the lamp after which it is secured
thereon by the lead plug or in any other convenient manner as before mentioned.
DRAWINGS.
In the accompanying drawings similar letters of reference indicate corresponding
parts.

page_text: link and e the perforated lug-Fig. 2 is a cross section thereof taken on the line A B
Fig. 1-Fig. 3 is a cross section thereof shewing the tie band b-Fig. 4 is a vertical
section thereof Fig. 5 is a plan view of the top thereof shewing the air ducts or
passages formed by the corrugations in the shield.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what
I claim is
1. A corrugated shield for a miner's safety lamp constructed arranged and fitted
all substantially in the manner and for the purposes hereinbefore described and
shewn.
2. Making such corrugated shield in one piece or in two three or more sections
substantially in the manner hereinbefore described.
Dated this 17th day of February 1888.
ELT & Co.,
33, Southampton Buildings,
Holborn, London,
Agents for the Applicant.