A New or Improved Miners' Safety Lamp for Testing the Presence of Gas in Mines.
Year: 1898

page_text: Date of Application, 6th Dec., 1898
Complete Specification Left, 6th Sept., 1899-Accepted, 14th Oct., 1899
A New or Improved Miners' Safety Lamp for Testing the Presence of
Gas in Mines.
I, WILLIAM BEST Manager of the Firm of Ackroyd and Best Limited, of
High Street, Morley, in the County of York, do hereby declare the nature of this
invention to be as follows:-
The object of this invention is to construct miners' safety lamps for testing
the presence of gas in mines, in such a manner that very thin streams or layers
of gas situated near the roof may be detected, whilst at the same time the thick-
ness or depth of the said layers may be measured with a fair degree of accuracy.
According to my invention, I dispense with the suspending hook at the top
of the bonnet, and in its place I employ a handle which is fulcrumed to the sides
of the bonnet in such a manner that it may be turned down away from the top of
the lamp. An inner shield is provided in the bonnet so as to lead the products
of combustion direct from the gauze to an opening in the upper plate of the
bonnet, and the said inner shield is provided with holes at its base for the purpose
of admitting air for the combustion of the lamp. An annular set of holes is
formed in the upper part of the bonnet for the purpose of admitting the air
supply, and one or more other sets of holes may be formed at different heights
in the bonnet, and one set can be formed in the base of the lamp. All the sets
of holes for the air supply are protected by ring gauzes, and these are provided
with cut off plates, in such a manner that the air supply may be cut off from
all or any of the sets of holes at will by the miner or other person using the lamp.
When the lamp is used for testing the presence of gas near the roof of a mine,
the air is admitted through the upper set of holes and the handle is turned down
out of the way.
The lamp may then be held almost in contact with the roof and
the thinnest layer of gas entering through the holes would be detected. On find-
ing a layer of gas. the air may be admitted through the various sets of holes until
no sign of gas is detected, thus measuring the thickness of the layer.
1
.T
1000
BREWER & SON,
London and Leeds, Agents for the Applicant.
COMPLETE SPECIFICATION.
A New or Improved Miners' Safety Lamp for Testing the Presence of
Gas in Mines.
I, WILLIAM BEST, Manager of the Firm of Ackroyd and Best Limited, of
High Street, Morley, in the County of York, 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 obiect of this invention is to construct minora' anfoty lamina fan

page_text: the presence of gas in mines, in such a manner that very thin streams or layers
of gas situated near the roof may be detected, whilst at the same time the thick-
ness or depth of the said layers may be measured with a fair degree of accuracy.
In order that my invention may be clearly understood, I will proceed to describe
the same with reference to the accompanying drawing in which Figure 1 is a
sectional elevation of a lamp constructed according to my invention and Figure 2
is a detail view. Similar letters of reference denote like parts in both figures.
According to my invention, I dispense with the suspending hook at the top
of the bonnet, and in its place I employ a handle A which is fulcrumed to the
sides of the bonnet G in such a manner that it may be turned down away from
the top of the lamp. An inner shield B is provided in the bonnet so as to lead
the products of combustion direct from the gauze C to openings D in the upper
plate of the bonnet G, and the said inner shield B is provided with holes E at
its base for the purpose of admitting air for the combustion of the lamp. An
annular set of holes F is formed in the upper part of the bonnet G for the pur-
pose of admitting the air supply, and a set of holes H is
formed in the lower part of the bonnet G, and another set J
can be formed in the base of the lamp. The holes J for the air supply
may be protected by ring gauzes as seen at J, and these gauzes J₁ are
carried on cut off plates K, in such a manner that the air supply may be cut off
from the holes J as required. The holes H are also provided with a cut off
ring H whereby they may be opened or cut off at will by simply turning the
said ring.
When the lamp is used for testing the presence of gas near the roof of a mine,
the air is admitted through the upper holes F, the rings H' and K being turned
so as to close the holes Hand J and the handle is turned down out of the way as
seen in Figure 1. The lamp may then be held almost in contact with the roof
and the thinnest layer of gas entering through the holes F is readily detected.
On finding a layer of gas, the air may be admitted through the holes H or J
until no sign of gas is detected, thus measuring the thickness of the layer.
The ring L supporting the glass M is provided with a pending flange L¹ for
the purpose of acting as a deflector for causing the incoming air from the
holes J to take a circuitous course in its passage to the flame of the lamp.
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. A miners' lamp for testing the presence of gas in mines having an inner
shield enclosing the gauze C and having holes E at its base, in combination
with a bonnet G having inlet holes F and outlet holes D, substantially as set
forth.
2. In a miners' lamp for testing the presence of gas in mines, the inner shield B
having holes E in the same, gauze and bonnet G having holes D and Fin
same, in combination with the holes J and pending flange L₁ of the glass ring L,
substantially as and for the purposes set forth.
3. The cut off rings H¹ and K and the protecting ring gauze J¹ substantially
as and for the purposes set forth.
Dated this 6th day of September A.D. 1899.
BREWER & SON,
London and Leeds, Agents for the Applicant.