Improvements in Electric Miners' Lamps.
Year: 1898

page_text: COMPLETE SPECIFICATION.
Improvements in Electric Miners' Lamps.
I, WILLIAM OUTTERSON WOOD, of South Hetton, in the County of Durham,
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:-
These improvements refer to the mode of attaching the lid to the lamp enclosing
frame and to the mode of electrically connecting the conducting wires or leads
with the incandescent lamp bulb and are specially suitable or applicable to the so-
called Lussmann Miner's Lamp described in Patent Specification No. 18150 of 1893.
Fig. 1 of the accompanying drawing is a plan view of a miners lamp constructed
according to my invention Fig. 2 a vertical section through the same, and Fig. 3 a
plan of the base of the lamp.
The base plate A is by a hinge B with slot B¹ passing over a staple on the box
containing the secondary or other battery attached to the said box, a lock or other
fastening being connected to the staple in the usual manner; the lip A¹ passes
over a rim on the box on the other side. The plate has flanges A' on the three
other sides. The four metal columns C are screwed into the base plate A and the
glass cylinder D rests upon the flange of an ebonite disc N cemented thereto.
Upon this cylinder with an intervening thin rubber disc G is placed the recessed
plate or lid E, and, upon this again the locking disc F. This locking disc has slot
holes F¹ somewhat keyhole shaped and the columns C have corresponding notches
to engage with the narrow part of the slot holes F¹. The boss F2 on the locking
disc F serves as a nut for the screw H. When the plate E with locking disc F
have been placed on so that the upper ends of the columns C pass through the
holes in the plate E and through the large part of the slots F¹ the locking disc F
can be turned round a little so that the notched part of the columns enter the
narrow part of the said slots until the screw H comes fair with a hole E¹ in the
plate E and to lock the lid in position the screw H is by a "key" of special form
screwed down so that its lower end enters the hole E¹ in the plate E.
One pole of the lamp is at the centre where it makes contact with a spring
blade I of the metal bracket I to which one conductor wire is connected, and the
other pole is in contact with the brass bush K on the bulb which is screwed into
the brass socket L screwed to the ebonite disc N. Upon the said disc is also a
brass lump N to which the other conductor wire is connected. M is a sliding
spring switch between the lump N' and the base of the brass socket L. When the
switch is in the position shewn the circuit is broken, but when the switch is pulled
out, the circuit is closed, as the switch then forms electrical connection between the
brass lump N' and the base of the brass socket L. The light reflector consists
of a lower cone part O and an upstanding lateral slightly concave disc part O'.
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. The means for closing and locking the lamp lid consisting of the locking

page_text: disc F with slot holes F the notched columns C and the screw H, substantially as
described and shewn.
2. The means for connecting the conducting wires with the lamp bulb poles
consisting of the central spring contact I¹ and the lateral contact N¹ with switch
M for contact with the brass bush K on the bulb, substantially as described and
shewn.
Dated this 21at doz of Mach 1900
ad this 21st down Mach 1000
this 21st day
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.