IMPROVEMENTS IN MINERS' DIALS OR CIRCUMFERENTERS
Year: 1874

page_text: LETTERS PATENT to Joseph Louis Casartelli, of Forty-three, Market
Street, Manchester, in the County of Lancaster, Instrument Maker, for
the Invention of "IMPROVEMENTS IN MINERS' DIALS OR CIRCUMFERENTERS."
Scaled the 24th November 1874, and dated the 27th May 1874.
PROVISIONAL SPECIFICATION left by the said Joseph Louis Casartelli
at the Office of the Commissioners of Patents, with his Petition,
on the 27th May 1874.
I, JOSEPH LOUIS CASARTELLI, of Forty-three, Market Street,
Manchester, in the County of Lancaster, Instrument Maker, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN MINERS'
DIALS OR CIRCUMFERENTERS," to be as follows:-
In the miners' dials as hitherto made the graduated scale is attached
to one side of the compass box as a separate article or piece, and needs
to be connected every time the dial is used, and disconnected when
packed up..

page_text: Now my improvements consist in applying the graduated scale in the
form of a semicircular arc or limb across the face of the compass box in
the direction of north and south, and also in the direction of the sights,
but so as not to obstruct the view through the sights.
The scale is attached to the compass box by a swivel joint at each end
of the semicircular arc or limb, so that it can be turned or folded down
between the rim of the compass box and the ring of the limb or plate.
which carries the sights when not required, and merely needing to bo
raised to a vertical position to be ready for use.
The face of the semicircular arc is graduated or marked in degrees or
other divisions, and forms the graduated scale, as explained, and the
degree of angle of rise or fall is shown by two pointers or indicator
points attached to the ring of the limb or plate which carries the sights
when the same is tilted on its axis.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Joseph Louis Casartelli in the Great Seal Patent
Office on the 26th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPHI
LOUIS CASARTELLI, of 43, Market Street, Manchester, in the County of
Lancaster, Instrument Maker, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-seventh day of May, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-seventh
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Joseph Louis Casartelli, Her special licence that
I, the said Joseph Louis Casartelli, my exccutors, administrators, and
assigns, or such others as I, the said Joseph Louis Casartelli, 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 "IMPROVE-
MENTS IN MINERS' DIALS OR CIRCUMFERENTERS," upon the condition. (amongst

page_text: others) that I, the said Joseph Louis Casartelli, my executors or admi-
nistrators, 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 Joseph Louis Casartelli, do hereby
declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement :--
1
In the miners' dials as hitherto made the graduated arc or scale is
attached to one side of the compass box as a separate article or piece,
and needs to be connected every time the dial is used, and disconnected
when packed up.
Now my improvements consist in applying the graduated scale in the
form of a semicircular arc or limb across the face of the compass box in
the direction of north and south, and also in the direction of the sights,
but so as not to obstruct the view through the sights.
The scale is attached to the compass box by a swivel joint at each end
of the semicircular arc or limb, so that it can be turned or folded down
between the compass box and the ring of the limb or plate which carries
the sights when not required, and merely needing to be raised to a
vertical position to be ready for use.
The face or edge of the semicircular arc is graduated or marked in
degrees or other divisions, and forms the graduated scale, as explained,
and the degree of angle of rise or fall is shown by two pointers or
indicator points attached to the ring of the limb or plate which carries
the sights when the same is tilted on its axis.
And in order that my said Invention may be more readily understood
I have annexed a Sheet of Drawings, wherein Figure 1 shows a per-
spective view of the complete miners' dial with the graduated scale in
position ready for use.
Figure 2 shows a portion of the compass box with the graduated
scale raised.or elevated as in use.

page_text: And Figure 3 shows a portion of the compass box with the graduated
cale folded down when not in use.
. In witness whereof, I, the said Joseph Louis Casartelli, have here-
unto set my hand and seal, this Twenty-fifth day of November,
in the year of our Lord One thousand eight hundred and seventy-
four.
."
JOSEPH LOUIS CASARTELLI. (L.S.)