Improvements in Mining Safety Lamp Glasses.
Year: 1891

page_text: Date of Application, 12th Sept., 1891-Accepted, 17th Oct., 1891
COMPLETE SEMITICATION.
Improvements in Mining Safety Lamp Glasses.
We STEPHEN HENRY ELLIS, MARSDEN ELLIS and WILLIE ELLIS trading
together under the style or firm of "Alfred Ellis & Sons" of No. 34 Northgate
Wakefield in the County of York Brass Founders 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:—
Miner's safety lamps are fitted with glass tubes or cylinders but as now made of
plain glass throughout they cause a quantity of the light to be dissipated. Our
improvement is to remedy this defect and provide means by which all the light
from the lamp will be concentrated upon the work being performed in the mine.
To carry out our invention in the making of the glass tube or cylinder we
combine with it a sheet of opal glass forming a section of a circle within or without
the ordinary plain glass tube before referred to. In the manufacture of the tube
In
a recess is formed to admit of the insertion of the opal piece of glass within or
without, as may appear more desirable, so that an even surface is maintained.
the finishing of the tube this piece is permanently combined with it.
This method of constructing mining safety lamp glasses causes the light of the
lamp to be wholly reflected on to the work in the mine and enables the workman
to better perform his duties by virtue of this economising or concentration of the
light by the means stated. We can make this inner or outer part, so combined
with the plain glass tube, any proportion of the tube or cylinder that may appear
requisite to fully answer the desired purpose of reflecting the light.
We also can attain the same object by painting the inner or outer part in place
of the opal or the using of any substance in conjunction with the opal or separately
which possesses the property of reflecting light.
And in order that our said invention and the manner of performing and carrying
the same into effect may be properly understood we have hereunto appended an
explanatory sheet of drawings in which the same reference letters are used to
indicate corresponding parts in all the figures where shown.
Fig. 1 shows a front view of a miners' safety lamp.
Fig. 2 is a plan of the same.
Fig. 3 is a section from the centre.
The part marked A is the metal cover; B. the well of the lamp. C represents
the burner; D the support for metal cover; E. the glass tube or cylinder; F. the
part combined with the plain glass tube forming the improvement as described;
Gapparatus for raising the wick. H. is a dotted line to represent the painting
which may be used along with part marked F or separately as an alternative
method.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
1. The use of opal, paint or any similar opaque substance in the making of glass
tubes or cylinders for miners safety lamps for the purposes and in the manner as
herein described.
Dated this 11th dox of Santambor 1801
H. P. DAWSON,
Agent for the Applicants.