An Improved Miners' Safety-lamp.
Year: 1891

page_text: Date of Application, 20th Feb., 1891
Complete Specification Left, 20.h Nov., 1891-Accepted, 24th Dec., 1891
PROVISIONAL SPECIFICATION.
An Improved Miners' Safety-lamp.
1, THOMAS LIMB, of Primrose Cottage, Croesvaen, near Pontyclown, in the
County of Glamorgan, Colliery Manager, do hereby declare the nature of this
invention to be as follows:-
The improved miners' safety-lamp in which this invention consists is constructed
and arranged in the manner following. The glass cylinder through which the
light from the flame is imparted is surmounted by a disc of gauze constituting a
perforated partition between the combustion chamber and the chimney. The latter
is composed of unperforated sheet metal and is conical, the top being narrowest.
Surrounding the chimney is a conical shield extending above the chimney top and
fitted at the upper end with a perforated cover above which is the usual hood.
Both the chimney and the shield terminate below at the step-top ring which is
screwed into place. The glass and the lower part of the lamp are conical, the
degree of inclination preferably corresponding to that of the chimney.
At the lower end the glass stands upon the usual ring, and below this is the
burner holder and the oil chamber the bottom of which is the base of the lamp.
The oil clamber may be screwed into place or secured by a slide or plug. Or it
may be otherwise attached to the body of the lamp.
Air for combustion is supplied to the burner towards the bottom of the lamp
either through perforations below the lower end of the glass or through channels
provided in the pillars. Before reaching the flame the air has further to pass
through perforations in the dome-shaped cover of the burner. By the provision of
the gauze partition between the combustion chamber and the chimney, protection is
obtained against explosion of gas. An explosive mixture on entering the com-
bustion chamber, either from above or below, extinguishes the flame of the wick
and the gauze partition prevents the flame from extending into the chimney above.
Thus communication for the Hame to the chimney is cut off and the explosive
mixture does not continue to burn after the wick flame has been extinguished. The
products of combustion pass out at the top of the chimney and through the
perforations in the cover of the external shield.
Dated this 19th day of February 1831
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, Agent.
COMPLETE SPECIFICATION.
An Improved Miners' Safety-lamp.
I, THOMAS LIMB, of Primrose, Cottage, Crosvaen, near Pontyclown, in the
County of Glamorgan, Colliery Manager, 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 :-
The improved miners' safety-lamp in which this invention consists is constructed
and arranged in the manner following. The glass cylinder through which the light
from the Haine is imparted is surmounted by a dise of gauze constituting a perforated
partition between the combustion chamber and the chimney. The latter is
composed of unperforated sheet metal and is conical, the top being narrowest.
Surrounding the chimney is a conical shield extending above the chimney top.
The shield may be fitted at the upper end with a perforated cover. Above the
shield and chimney is the usual hood. Both the chimney and the shield terminate
P11

page_text: below at the step-top ring which is screwed into place. The glass and the lower
part of the lamp are conical, the degree of inclination preferably corresponding to
that of the chimney. At the lower end the glass stands upon the usual ring of
asbestos, or the like; and below this is the burner holder and the oil chamber the
bottom of which is the, base of the lamp. The oil, chamber may be screwed into
place or secured by a slide or plug. Or it may be otherwise attached to the body
of the lamp.
.Air for combustion is supplied to the burner either through perforations below
..the lower end of the glass, or through channels provided, in the.. pillars,, or. through
a ring of gauze. Before reaching the flame the air has further. to. pass through
perforations in the bulb of the burner.
The appended drawing represents a view, partly elevation and partly section, of
a miners' safety-lamp constructed in accordance with this invention.
"The glass cylinder a surrounding the burner is surmounted by a piece of gauze b
which may either be flat.or dome-shaped as shown. This gauze constitutes a
perforated partition.intervening, between the combustion chamber and the chimney.c.
The latter is composed of unperforated sheet metal and is conical, as shown.
Surrounding it is a correspondingly shaped shield d. The lamp is thus conical in
shape upwards from the top of the oil chamber, which latter may be constructed
either to be screwed, into place or to be.secured by a plug or other means.
·
Air for feeding the flame may, as shown in the drawing, be supplied to. the
combustion chamber either through apertures e provided in the case below the level
of the bottom of the, glass at, or it may be conducted to the chamber through the
pillars which in that case would be tubular. A ring of gauze is placed inside the
wall of the lamp case and through this gauze the air.has access to the burner, but
before reaching the flame. it passes through perforations provided in the bulb of the
burner. As an alternative to using a gauze ring such as the wall of the body of
the lamp may be finely perforated.
In event of the lamp being exposed to an explosive mixture the said mixture on
obtaining access to the flame and becoming ignited is prevented by the gauze
partition from passing upwards out of the combustion chamber into the chinney
and becomes extinguished in the said chamber after having extinguished the wick
flame. The products of combustion pass out at the top of the lamp in 'the
usual way.
The lamp wick may be either: flat or round and be adapted to be raised or lowered
by an ordinary pricker or by racks and.pinions.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim.is
1. In a miners' safety-lamp, the provision of a piece of gauze such as & constituting
a perforated or reticulated partition intervening between the combustion chamber
and the chimney, substantially as hereinbefore described and for the purpose
specified.
42.In, a miners, safety-lamp, the provision of a gauze ring such as finterposed
between the wall of the lamp case and the burner so that the air to..feed the Hame
passes through the said ring,.substantially, as herein before described.
3. In a miners' safety lamp, the alternative to, the.use of the ring.f, said
alternative, being the provision of fiue, perforations in the wall of the lamp case, as
hereinbefore set forth.
Dated this 16th day of November 1891.
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, 'Agent.