Improvement Connected with Oil Lamps to Produce Safety against Explosions, to Keep the,
Year: 1886

page_text: Date of Application, 25th Nov., 1886.
Complete Left, 25th Aug., 1887.
Complete Accepted, 27th Sept., 1887.
n Improvement Connected with Oil Lamps to Produce Safety
against Explosions, to Keep the Oil Cool, to Extinguish the
Flame in the Event of an Upset, to Ensure Consumption to
the Last Drop of Oil in Reservoir, and also to Prevent Wick
Dropping into the Reservoir if Turned too Low.
An Improvement Connected with Oil Lamps to Produce Safety
against Explosions, to Keep the Oil Cool, to Extinguish the
Flame in the Event of an Upset, to Ensure Consumption to
the Last Drop of Oil in Reservoir, and also to Prevent Wick
Dropping into the Reservoir if Turned too Low.
1, RICHARD ROBERT HARPER of 86 Clifton Street, Finsbury, London, Electrician,
to hereby declare the nature of this invention to be as follows:-
The object of this invention, is a certain improvement in oil lamps by the
application of which to existing lamps, or in the construction of new lamps, the
following advantages are obtained.
1. Perfect safety against explosions-there being no direct heat communicated to
he reservoir.
2. Ventilation of reservoir by outside pin hole to maintain the oil in a cool state.
3. Positive and instantaneous cut off between oil and wick should the lamp be tilted
beyond a certain angle or be up set.
4. Consumption of oil to last drop without diminish of flame.
5. Impossibility of wick dropping into reservoir if turned too low.
According to my invention I provide the "socket" with a tube reaching down to
within a line or so of the bottom of the reservoir and I fix a deep or long wick tube
elow the solid base plate of the burner, said deep or long wick tube fitting into the
ocket tube but with a clear space all round between them.
No oil can flow to the wick except from under the socket tube, and then only in
proportion to the consumption by the flame, consequently the wick can never get
vercharged and the usual formation of carbon crust on the wick is reduced or
practically prevented, the flame being kept clear and brilliant.
Dated this 25th day of November 1886.

page_text: An Improvement Connected with Oil Lamps to Produce Safety
against Explosions, to Keep the Oil Cool, to Extinguish the
Flame in the Event of an Upset, to Ensure Consumption to
the Last Drop of Oil in Reservoir, and also to Prevent Wick
Dropping into the Reservoir if Turned too Low.
do hereby declare the nature of my said invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:
The object of this invention is a certain improvement in oil lamps.
According to my invention I provide the socket A, see Figure 1, with a tube B
reaching down to within a line or so of the bottom of the reservoir C, as at Figure 2,
and 1 fix a deep or long wick tube D below the solid base plate E of the burner F,
see Figure 3, said deep or long wick tube D fitting into the socket tube B see
Figure 2 but with a clear space all round between them as at sectional plan Figure 4
this being taken through lines x, x, Figure 2.
It will be noticed by examining the drawing Figure 2 that no oil can flow to the
wick except from under the socket tube B and then only in proportion to the
consumption by the flame, consequently the wick can never get overcharged and
the usual formation of carbon crust on the wick is reduced or practically prevented,
the flame being kept clear and brilliant.
The reservoir is ventilated by the pin hole G.
The tube B may be in a piece with the socket A as at Figure 2, or it may be
separate and screwable into the socket, as at Figure 5, the flange H enabling it to
be gripped for turning, when the reservoir has to be fresh charged without otherwise
interfering with the burner F or wick tube D.
The air contained in the tube B prevents the oil rising to the same level as in the
reservoir C consequently the bottom end of the wick only is saturated the flow of oil
to the burner being by conduction.
The advantages to be derived from my invention are
1. Perfect safety against explosions there being no direct heat communicated to
the reservoir.
2. Ventilation of reservoir by outside pinhole to maintain the oil in a cool state.
3. Positive and instantaneous cut off between oil and wick should the lamp be tilted
beyond a certain angle, or be upset.
4. Consumption of oil to last drop without diminish of flame.
5. Impossibility of wick dropping into reservoir if turned too low.

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 :-
Providing an oil lamp with a deep or long wick tube D within a deep or long
socket tube B, both of said tubes, B, D, reaching to near the bottom of the oil
reservoir C, substantially as shown at Figure 2 of the annexed drawings for the
purposes set forth.