AN INSTRUMENT IN TAKING ZENITH OBSERVATIONS AT SEA (WHEN THE HORIZON IS OBSCURED) OF ANY PLANET
Year: 1857

page_text: LETTERS PATENT to Edward Cavendy, of the City, County, and State of
New York, a Subject of the Government of the United States of America,
for the Invention of "AN INSTRUMENT IN TAKING ZENITH OBSERVATIONS AT
SEA (WHEN THE HORIZON IS OBSCURED) OF ANY PLANET."
Sealed the 1st April 1858, and dated the 6th October 1857.
PROVISIONAL SPECIFICATION left by the said Edward Cavendy at the
Office of the Commissioners of Patents, with his Petition, on the
6th October 1857.
I, EDWARD CAVENDY, of the City, County, and State of New York, a
Subject of the Government of the United States of America, do hereby declare
the nature of the said Invention of "AN INSTRUMENT IN TAKING ZENITH
OBSERVATIONS AT SEA (WHEN THE HORIZON IS OBSCURED) OF ANY PLANET," to be
as follows:-
It consists of a copper or other metallic tube or telescope, with magnifying
and reflecting glasses, and crossed wires moving on a universal hinge, and
suspended on a tripod..

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Edward Cavendy in the Great Seal Patent Office on the
6th April 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
CAVENDY, of the City, County, and State of New York, a Subject of the
Government of the United States of America, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixth day of October, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twentieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Edward Cavendy, Her special licence that I, the said Edward Cavendy, and
my executors, administrators, and assigns, or such others as I, the said Edward
Cavendy, or my 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 "AN INSTRUMENT
IN TAKING ZENITH OBSERVATIONS AT SEA (WHEN THE HORIZON IS OBSCURED) OF
ANY PLANET," upon the condition (amongst others) that I, the said Edward
Cavendy, or my executors or administrators, by an instrument in writing
under my, 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 I, the said Edwd Cavendy, do hereby declare
the nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Drawing:-
The nature of my Invention is in the construction and arrangement of
an instrument by and through which an observer at sea, through his quadrant,
can ascertain the zenith of a planet when the horizon is obscured. It consists
of a metallic tube or telescope, with magnifying and reflecting glasses, and
cross wires moving on a universal hinge, and suspended on a metallic tripod, as
represented in the Drawing, where A represents the tripod; B, the telescope;
C, the reflecting glasses, at an angle of 45°; S, the sun; and Z, the zenith.
Having thus described the Invention, and the manner in which it is to be

page_text: used, what I claim and desire to secure under the herein-before in part recited
Letters Patent is, the construction and arrangement of an instrument, sub-
stantially as described, for the purpose above mentioned.
In witness whereof, I, the said Edward Cavendy, have hereunto set my
hand and seal, on this Fourth day of February, in the year of our
Lord One thousand eight hundred and fifty-eight.
EDWD CAVENDY. (L.S.)