A HYDROSTATICAL OR PREUMATICAL CHRONOMETER
Year: 1813

page_text: TO, ALL TO WHOM THESE PRESENTS SHALL COME, I, SIGISMUND
RENTZSCH, of George Street, Saint James's Square, in the County of Middlesex,
Watchmaker, send. greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent, under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing. date at Westminster, the. Thirteenth day of
March, in the fifty-third year of His reign, give and grant unto me,. the
said, Sigismund Rentzsch, His especial licence that I, the said Sigismund
Rentzsch, during the term of years therein mentioned, should and lawfully
might use, exercise, and vend, within England, Wales, and the Town of
Berwick-upon-Tweed, my Invention of "A HYDROSTATICAL OR PREUMATICAL
CHRONOMETER;" in which said Letters Patent there is contained a proviso
obliging me, the said Sigismund Rentzsch, by an instrument in writing under
my hand and seal, to cause a particular description of the nature of my
said Invention, and in what manner the same is to be performed, to be
inrolled in His Majesty's High Court of Chancery within six months
after the date of the said recited Letters Patent, as in and by the same,
relation being thereunto had, will more fully and at large appear.
NOW KNOW YE, that I, the said Sigismund Rentzsh, in compliance
with the said proviso, do hereby declare that the principle of this instrument
is a heavy fluid acting as a weight on a specific lighter fluid, and pressing
equal quantities thereof in equal times through an unalterable apperture.
It consists of a hollow glass ring, about four inches diameter, which revolves
on an axis, and contains mercury and air, or any other fluids of different

page_text: giavities, hermetically enclosed; the heaviest will occupy the lowest part.
In the upper part, which contains the light fluid, there is a partition, with
a small perforation through it, made of glass, or any other material that
has no affinity with the enclosed fluids. The moving power is a weight
attached to the axle by means of a cord, which produces a circular motion
at the same rate that the light fluid is forced through the aparture in the
partition by the pressure of the heavy fluid, which, by the force of gravity,
endeavours to ascend to the same situation it held before the application of the
weight. The time is indicated by a graduated circle on the glass ring and
a fixed index. The advantages attending these chronometers are, that they
are not subject to variation from change of temperature or accumulation of
dirt, the application of oil being unnecessary. Although form and dimensions
are specified, it is to be understood that both may be varied without deviating
from the general principle..
In witness whereof, I, the said Sigismund Rentzsch, have hereunto set
my hand and seal, th Tenth day of September, in the year of our
Lord One thousand eight hundred and thirteen.
AND BE IT REMEMBERED, that on the Tenth day of September, in the
year of our Lord 1813, the aforesaid Sigismund Rentzsch came 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.