Improvements in Miners' Safety-lamps.
Year: 1887

page_text: Date of Application; 29th June, 1887
Comp ete Left, 29th Mar., 1888
Complete Accepted, 29th June, 1888
Improvements in Miners' Safety-lamps.
I JOHN: TREHERNE, Mining Engineer, Oxen Street, Ilanelly, Carmarthenshire,.do
hereby declare the nature of this invention to be as follows:-
Fig. 1. on drawing shows the front elevation of the lamp complete with the circular
indentation in the part where screwed together at bottom, in which should be set each
morning an Official Seal with the initials of the Colliery Proprietors thereon as shewn,
viz. Ñ. D. (Nevill Druce) and all other Colliery Proprietors initials according to
their respective names. As this seal would bind together the two portions of the lamp,
it could not be broken by the miners without opening it, thereby causing immediate
detection.
Fig. 2. represents the lamp tampered (opened) with, and shews the Official Seal
broken.
Fig. 3. is a cross section of the circular indentation in the lamp, shewing the .
Copper cover which is to prevent the Official Seal from being covered with coal
dust &c.

page_text: I, JOHN TREHERNE, Mining Engineer, Oxen Street, Llanelly Carmarthenshire, do
hereby declare the nature of this invention and in what manner the same is to
bo performed, to be particularly described and ascertained in and by the following
statement :-
Fig. 1, shews the front elevation of the lamp complete, with the circular indentation
in the part where screwed together at bottom, in which should be set each morning
an Official Seal with the initials of the Colliery Proprietors thereon as represented in
the drawing viz.-N. D., (Nevill Druce) and all other Colliery owners according to
their respective names.
As this seal would bind together the two portions of the lamp, it could not be
broken by the miners without opening it, thereby, causing immediate detection.
Each lamp should be numbered and entered in a book with the miners name, who
usos same.
In addition to the abovo, the lamp is provided with a double glass cylinder B. B.,
containing clear filtered water in middle at D. D; also double wire gauze
cylinder C. C.
In the case of the former, should the lamp meet with an accident through a fall of
coal or rubbish, thereby breaking the glass, the water in same would at once put the
light out; therefore, rendering an explosion impossible.
In the case of the latter, the double gauze will prevent the light from within coming
in contact with the gasses outside the lamp, as it would be impossible, in any current
of air, for the flame to be blown throgh both gauzes.
Fig. 2. represents the lamp tampered (opened) with, and shews the official seal E. E.,
broken.
Fig. 3. is a side elevation of the circular indentation F., in the lamp shewing the
copper cover G. which is to prevent the official seal from being covered with coal
dust &c. &c.
Fig. 4. is an borizontal section of the glass cylinder A. A.

page_text: 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 -
Firstly; The indentation where the lamp is screwed together, and the official seal
which is to prevent the miners from opening same undetected.
Secondly; The double glass cylinder, which is for the purpose of containing water
so as to ensure the extinguishing of the light in the lamp in case of accident.
Thirdly The double wire gauzo cylinder which is to protect the light in strong
;
currents of air.