IMPROVEMENTS IN LAMPS FOR BURNING PARAFFIN, PROVISIONAL SPATION
Year: 1864

page_text: LETTERS PATENT to Thomas Rowatt, the younger, and Alexander Ligh-
body, of Edinburgh, in the County of Mid Lothian, North Britain,
for the Invention of "IMPROVEMENTS IN LAMPS FOR BURNING PARAFFIN,
PROVISIONAL SPECIFICATION left by the said Thomas Rowatt and
Alexander Lighbody at the Office of the Commissioners of Patents,
with their Petition, on the 25th February 1864.
We, THOMAS ROWATT, the younger, and ALEXANDER LIGHBODY, of Edinburgh,
in the County of Mid Lothian, North Britain, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN LAMPS FOR BURNING PARAFFIN,
BELMONTINE, PETROLEUM, AND OTHER LIKE HYDROCARDON FLUIDS," to be as
follows:-
This Invention relates principally to that class of lamps used in stables and
for out-door purposes. In such lamps there has hitherto been one solid rim
(or windguard) between the ordinary outer perforated rim and the burner, but
we employ two rims instead of the solid rim, the one being stationary and the
other partially revolving or sliding upon the stationary rim. The two rims.
have a number of slots or openings in them, so that when the lamp is used
indoors, or where it may not be liable to be blown out, the sliding rim is
partially turned one way and the slots will be opposite each other, and thus
admit a larger supply of air to the flame to insure perfect combustion. When

page_text: the lamp however is to be used outside, or where it may be exposed to a
current of air, the sliding rim is turned the reverse way and the slots or
openings are closed, and the lamp will then be wind-proof. To the sliding rim
is fixed a pin which passes through a slot in the ordinary outer perforated
rim, and the pin and sliding rim are moved to and fro by hand.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Thomas Rowatt and Alexander Lighbody in the Great
Soal Patent Office on the 24th August 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, wе, THOMAS
ROWATT, the younger, and ALEXANDER LIGHBODY, of Edinburgh, in the County
of Mid Lothian, North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of February, in the year of our
Lord One thousand eight hundred and sixty-four, in the twenty-seventh year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto us, the said Thomas Rowatt, the younger, and Alexander Lighbody',
Her special licence that we, the said Thomas Rowatt, the younger, and Alex-
ander Lighbody, our executors, administrators, and assigns, or such others
as we, the said Thomas Rowatt, the younger, and Alexander Lighbody, our
executors, administrators, and assigns, should at any time agree with, and no
others, from time to time, and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN LAMPS FOR BURNING PARAFFIN,
BELMONTINE, PETROLEUM, AND OTHER LIKE HYDROCARBON FLUIDS," upon the con-
dition (amongst others) that we, the said Thomas Rowatt, the younger, and
Alexander Lighbody, our executors or administrators, by an instrument in
writing under our, or their, or one of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what manner
the same was to be performed, and cause the same to be filed in the Great
Seal Patent Office within six calendar months next and immediately after
the date of the said Letters Patent.
NOW KNOW YE, that we, the said Thomas Rowatt, the younger, and
Alexander Lighbody, do hereby declare the nature of our said Invention,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement thereof, reference being had

page_text: to the Figures on the accompanying Sheet of Drawings, and to the letters
marked thereon (that is to say):-
Fig. 1 is an elevation of a lamp provided with our improvements; Fig. 2, a
section of the lower part of the same; and Figs. 3 and 4 are detached views of
some of the parts.
This Invention relates principally to that class of lamps used in stables and
for out-door purposes, and consists in admitting by a simple contrivance a
large supply of air to the flame to insure perfect combustion when the "wind-
guard" is not needed. In such lamps thero has hitherto been one solid rim
(or windguard) between the ordinary outer perforated rim and the burner,
but we employ two rims a and b instead of the solid rim, the rim a being
stationary and the other rim 6 partially revolving or sliding upon the stationary
rim. The two rims have a number of slots or openings c in them, so that
when the lamp is used indoors, or where it may not be liable to be blown out,
the sliding rim b is partially turned one way and thereby causes the slots to bo
opposite each other, and thus admit a larger supply of air to the flame to
insure perfect combustion. When the lamp however is to be used outside, or
where it may be exposed to a current of air, the sliding rim 6 is turned the
reverse way and the slots or openings are closed; and the lamp will then be
wind-proof. To the sliding rim is fixed-a pin or wire d which passes through
a slot in the ordinary outer perforated rim e, and the pin and sliding rim arc
moved to and fro by hand.
Having now described the nature and particulars of our said Invention, and
the manner in which the same is to be performed, we desire it to be under-
stood that we claim as our Invention, the application to stable or out-door
lamps of two slotted rims between the burner and ordinary outer perforated
rim, for the purpose of admitting a larger supply of air to the flame to insure
perfect combustion, as all such improvements are herein described and illus-
trated in the accompanying Sheet of Drawings.
In witness whereof, we, the said Thomas Rowatt, the younger, and
Alexander Lighbody, have hereunto set our hands and seals, this Tenth
day of August, in the year of our Lord One thousand eight hundred
THO. ROWATT, JR. (L.S.)
ALEXR. LIGHBODY. (L.S.)