Year: 1886

page_text: Date of Application, 21st Sept., 1886.
Complete Left, 3rd June, 1887.
Complete Accepted, 5th July, 1887.
ALFRED DUCKWORTH MELSON Manufacturer 26 Masshouse Lane Birmingham do
hereby declare the nature of this invention to be as follows:
:-
A method by which a much greater amount of air than has ever previously been
possible may be admitted into a dark lantern, without allowing light to escape.
I fix the reservoir containing the oil in a bayonet shaped socket, allowing a space
inside the socket between the bottom of the reservoir & the bottom of the lantern,
beneath the reservoir, I make a large hole through which I admit the air to the afore-
said space, & round the base of the bayonet shaped socket I cut a number of horizontal
holes through which it passes to the interior of the lantern.
By this arrangement while I admit the air freely causing a most brilliant light, all
escape of light when lantern stands at dark is effectually prevented.

page_text: ALFRED DUCKWORTH MELSON Manufacturer 26 Masshouse Lane Birmingham, 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
A method by which a much greater amount of air than has been previously possible
may be admitted into a dark lantern, without allowing any light to escape.
I fix the reservoir containing the oil in a bayonet shaped socket (A Fig. 1) at the
base of the lantern allowing a space between the base of the reservoir & the bottom
(B Fig. 4) of the lantern. Beneath the reservoir & inside the aforesaid socket I
make a large hole (C Fig. 1) through which the air is admitted to the aforesaid
space, & round the base of the bayonet shaped socket I cut a number of horizontal
holes (1) Fig. 1) through which the air passes to the interior of the lantern. By this
arrangement, while the air is admitted freely causing a most brilliant light, all escape
of light when lantern stands at dark is effectually prevented.
To prevent the heat which arises from the increased flame making the top of lantern
too hot for the hand. I put an additional cowl (E Fig. 1) on the top of the lantern
which is unconnected with the interior & so remains cool.
Fig. 1 represents lantern complete, shews the Bayonet socket & the way in which
the current of air enters & proceeds to the interior of the lantern, through the large
hole at the bottom of the lantern & the horizontal holes at the base of the bayonet
socket.
Fig. 2 represents the oil reservoir.
Fig. 3 represents how the bottom of the oil reservoir is domed up so as to allow the,
air to enter by the large hole which is beneath it when it is in position in the lantern.
Fig. 4 represents (by the dotted line) the position of the concave bottom of the
oil reservoir when in position the arrows showing the directions of the currents of air.
Having now particularly described & ascertained the nature of my said invention
& in what manner the same is to be performed I declare that what I claim is
1st. The method by which a much greater amount of air may be admitted to a dark
lantern without allowing any light to escape.
2nd. The method by which with the increased flame the top of the lantern may be
kept cool for handling.
Dated this 2nd day of June 1887.
ALFRED DUCKWORTH MELSON.