A PORTABLE SAFETY ELECTRIC LAMP, FOR MINERS DIVERS, AND OTHER PURPOSES
Year: 1884

page_text: I, EDWARD THOMAS BOSTON, Architect and Surveyor of Craigleith, St: Andrews
Park Bishopston,, Bristol do hereby declare the nature of my invention for
A PORTABLE SAFETY ELECTRIC LAMP, FOR MINERS DIVERS, AND OTHER PURPOSES
to be as follows:-
A primary battery consisting of angular porous plates and other cells which
contain corrugated or flat angular metal and perforated carbon plates. The outer
cells are of gutta percha, wood, glass, or earthenware and metal. The top of lamp
is secured by clips having an excentric motion.
The incandescent lamp is protected by an outer thick glass and strong metal-
guard.
The battery is so constructed that it can either be worked with or without a
ventilating chamber which contain valves.
The whole cost of working the lamp nine hours to give a light equal to two and
a half candle power will not exceed three farthings.
The top cover of the lamp to which the metal and carbon plates are fixed lifts
out of the cells when not in uso. It has two long hinged plates fixed on the top
and sides; at the lower part of these plates are oblong holes which fall (when the
lamp is in use) over two studs fixed on the aides of the outer lower case, theso
studs work with an excentric motion so that when they are turned the top cover is
tightened to the lower case.
The incandescent lamp is fixed to the two poles by having angle piecos of brass
sodered to the terminal eyes of the lamp, through these pieces are holes similar to
ones made in the upright plates forming the poles; two small set screws pass
through these holes, the fixing is then complete.
•
The lamp is protected by a thick glass-shade fitted at the base into a brass ring
having a male thread cut onto it, this screws into another plate ring which is fixed
to the top.
The battery is square on plan divided diagonally into four cells which are fitted
with porous plates or angular cells,
The metal and carbon plates have terminals passing through an ebonite top
which are fastened and connected together by clips fixed to the top, this is enclosed
in a wooden cover. The metal terminals after passing through the clips on the
ebonite cover also pass through the wooden one and fixed with rising nuts to
enable the metal plates to be refitted quickly without exposing the connections.
The size of the battery complete to work the lamp is four inches square by eight
inches in height.

page_text: COMPLETE SPECIFICATION.
I, EDWARD THOMAS BOSTON, Architect and Surveyor Craigleith, St: Andrews
Park Bishopston, Bristol, do hereby declare the nature of my invention for
A PORTABLE ELECTRIC LAMP and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :—
The battery (which is a primary one) is square on plan and divided diagonally,
or from corner to corner thus giving four angular compartments, 1; these are made
either of gutta percha, india rubber, ebonito, glass, earthenware, papier-mache, or
covered wood. Into the innor angles of these compartments porous plates 2 or
porous movable cells are fitted, four of them forming a square.
The battery is fitted into an outer ebonite or wooden case having a bevilled
top 3.
The carbon rods or plates which form the working parts of the battery aro
perforated, 4 the metal plates are flat or corrugated, 5 these are fixed to an ebonito
top 6 in the following manner, viz: The carbon rods pass through the ebonite top,
these are fixed into metal caps 7 and screwed to the ebonito.
The metal plate" carriers" 8 are made of small brass tubes socured at the top of
the ebonito by nuts, 9 this tubo is about two thirds the depth of the cells the lower
portion being flattened, 10 near the bottom of the flat part is fixed a stud 11 which
is screwed on the outer part for an ebonite nut 12 down this tube extending from
the carbon rods an insolated copper wire is brought 13 to the stud which has a
silver cap 14 fitting over the stud, a small spring being fixed to the flange, upon
this cap, and pressing against the spring metal plates 5 are fitted, these plates have
holes in the centre so that they may be reversed from top to bottom when any
destruction takes place, when a new plate is required the ebonite out from the stud
is unscrewed.
The whole of the "carriers" (except the silver cap) are ebonized.
The terminals from the two poles 15 pass from the ebonite top through the outer
case to the incandescent lamp 16 which is fixed to them by having larger eyes 17
made to the lamp than those in present use, two set screws 18 secure the lamp to
the terminals. .
The incandescent lamp is protected by a thick glass shado 10 having a screw
ring at the bottom, 20 this screws into a base plate fixed at the top of the outer
bevilled case.
This glass shade is protected by a strong brass guard or cago 21
which is also scrowed to the same base plate as tho shade.
The outer, ebonite or wooden, top cover is secured to the lower outer cover (when
the battory is working) by two hinged plates 22 fixed onto the top, near the lower
part of these plates there are oblong holes cut which fit over two thumb screws 23
these studs or screws are screwed to the sides of tho. outer caso working with an
excentric motion, between the top and the lower case a thick sheet of india-
rubber 24 is placed so that when the thumb studs are turned the top and lower
part of the case is tightened which prevents any escape of gas which may generato
in the battery during its action."

page_text: A drop wire handle 25 is fixed to the sides of the outer case, the holding portion
having a thick india rubber tube 26 passed over the wire to prevent cutting the
hands.
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. The shape of the compartments and cells forming the battery which givo a
much larger area of metal plates than other batteries in a much smaller space.
2. The method of removing and fixing the metal plates to the "carriers."
3. The corrugation of the metal plates, which increases the area over double that
of a flat one.