CERTAIN IL- PROVEMENTS IN DAY OR NIGHT TELESCOPES, WHEREBY THE SAME WILL BE RENDERED MORE PORTABLE THAN THEY NOW ARE
Year: 1806

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, wc, CHARLES
ROBERT WEST, of Plough Court, Fetter Lane, in the City of London,
Optician, and WILLIAM BRUCE, of King's Head Court, Shoe Lane, in the
City of London aforesaid, Optical Turner, send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Twenty-first day of
March, in the forty-sixth year of His reign, did give and grant unto the said
Charles Robert West and William Bruce, our exors, admors, and assigns,
His especial licence, full power, sole privilege and authority, that we, the said
Charles Robert West and William Bruce, our exors, admors, and assigns,
during the term of fourteen years therein mentioned, should and lawfully
might make, exercise, and vend within that part of His said Majesty's
Kingdom of Great Britain and Ireland called England, His Dominion of
Wales, and Town of Berwick-upon-Tweed, our Invention of "CERTAIN IL-
PROVEMENTS IN DAY OR NIGHT TELESCOPES, WHEREBY THE SAME WILL BE RENDERED
MORE PORTABLE THAN THEY NOW ARE;" in which said Letters Patent there is
contained a proviso, obliging us, the said Charles Robert West and William
Bruce, or one of us, particularly to describe and ascertain the nature of our
said Invention, and in what manner the same is to be performed, by an

page_text: instrument in writing under our hands and seals, or under the hand and scal
of one of us, and to cause the same to be inrolled in His Majesty's High
Court of Chancery within one calendar month next and immediately after the
date of the said recited Letters Patent, as in and by the same, relation being
thereunto bad, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, we, the said
Charles Robert West and William Bruce, do hereby describe and ascertain
the nature of our said Invention, and in what manner the same is to be per-
formed, by the Drawings in the margin hereof, and the following description
thereof, that is to say :-
Our improved day or night telescope is so constructed as to be rendered
more portable and steady than any telescope of this kind now in use;
and we gain this portability by making a small draw or sliding tube, as at A,
which contains the third and fourth eye glasses, and which draw or tube is
conducted through the collar B, and is made to screw into the bottom part of
the draw C. The third cell is so constructed as to have a bearing in the inside
of the draw C, and the fourth cell is so constructed as to have a bearing in
the inside of the draw D, so that it is not possible for the draw or sliding tube
A ever to get out of the parallel line of the other glasses, which is the case
with other telescopes. The small draw or sliding tube A when pulled out
strikes against collar E, which is constructed or mado inside the draw D, and
by that means separates the glasses to a proportionate distance. The stop F
screws or fastens on to the bottom of the draw D, or the same may occasionally
be screwed or fastened to one of the other draws, which will have the same
effect in preventing the small draw or sliding tube A from striking against the
object glass, and at the same time force the draw A into its proper position
when shut up; or the portability may be equally gained by screwing the
small draw or sliding tube A into the bottom of draw D. And further, we
do make the fourth glass accromatic, which assists in giving a greater
proportion of light to the instrument. In every other respect the telescope is
made as usual.
In witness whereof, we, the said Charles Robert West and William
Bruce, have hereunto set our hands and scals, this Twenty-first lay
of April, in the year of our Lord One thousand eight hundred and

page_text: AND BE IT REMEMBERED, that on the Twenty-first day of April, in
the year of our Lord 1806, the aforesaid Charles Robert West and William
before our said Lord the King in His Chancery, and
acknowledged the Specification aforesaid, and all and every thing therein
contained and specified, in form above written. And also the Specification
aforesaid was stampt according to the tenor of the Statute made for that
purpose.
Inrolled the Twenty-first day of April, in the year of our Lord One
thousand eight hundred and six.