PROVEMENTS IN ROOF LAMPS FOR RAILWAY AND OTHER CARRIAGES, WHICH IMPROVE- MENTS MAY ALSO BE APPLIED TO OTHER LAMPS
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by John Stokes at the Office of the
Commissioncis of Patents on the 1st February 1877.
88
IM-
JOHN STOKES, of Bumingham, in the County of Warwick, Lamp Maker
PROVEMENTS IN ROOF LAMPS FOR RAILWAY AND OTHER CARRIAGES, WHICH IMPROVE-
MENTS MAY ALSO BE APPLIED TO OTHER LAMPS"
My said Invention consists of the improvements herein-after described in 100f
lamps for 1ailway and other carnages, and in other lamps in which the reservo11 18
situated at a higher level than the wick, by which improvements the filling of the
resel vou may be effected without removing the wick or extinguishing the lamp,
and the inconveniences attending the filling of the reservoirs of the said lamps as
ordinarily constructed are avoided
I will describe my Invention as applied to a railway carnage roof lamp I
connect the annular reservoir with the wick case by means of a vertical tube on the
under side of the reservoir, the said vertical tube being connected with the hon-
zontal tube which supports the wick case The vertical tube described contains
within it two other vertical tubes, which I will call the filling tube and the an tubo
respectively, the filling tube passes up through the reser von and opens at the
upper side of the reservon, its top open end being funnel-shaped, and its lower end
terminating at the horizontal tube The an tube opens at top into the upper part
of the reservoir, and at bottom into the barrel of a stop-cock situated at the
Junction of the vertical and horizontal tubes The plug of this stop-cock has a way
or passage in it of such a form that when the said plug is turned into one position
it shuts off the communication between the horizontal pipe canying the wick case,
and the vertical tube conveying oil from the resei von, and at the same time opens
a communication between the air tube and the atmosphere When the plug of the
top-cock is turned into its other position it closes the communication between the
atmosphere and the air tube, and opens the communication between the vertical and
horizontal tubes.
The action of the parts described is as follows -When the stop-cock is in the
ast-described position the sinking of the level of the oil in the wick case below the
proper level allows a bubble of air to ascond through the an pipe into the reservoir,
and a corresponding quantity of oil to descend to the wick case as in ordinary
Ponce D71

page_text: fountain lamps When the stop-cock is in its other position the communication
between the reservou and wick case is closed, and communication between the
upper part of the resei von and the atmosphere opened through the an tube Oil
can now be poured in the funnel-shaped mouth of the filling tube, this oil descends,
passes out at the bottom of the filling tube, and ascending outside it 11ses by means
of the vertical tube into the reservoir, the displaced air passing into the atinosphere
by the air tube
The
When the reservoir is filled the stop-cock is turned so as to shut off the air tube
from the atmosphere and put it in communication with the wick case, and at the
same time to open communication between the wick case and the reservoir
1eservoir can thus be readily replenished without removal from its place, and
without interfering with or interrupting the burning of the lamp
Although my Invention is especially applicable to roof lamps for railway and
other carriages, yet my said Invention may also be applied to other lamps