IMPROVEMENTS IN GRINDING STONES AND WHETSTONES
Year: 1853

page_text: LETTERS PATENT to John Haskett, of 52, Wigmore Street, Caven-
dish Square, in the County of Middlesex, for the Invention of
"IMPROVEMENTS IN GRINDING STONES AND WHETSTONES."-A com-
munication.
Sealed the 15th September 1853, and dated the 18th March 1858.
PROVISIONAL SPECIFICATION left by the said John Haskett at the
Office of the Commissioners of Patents, with his Petition, on the
18th March 1853.
I, JOHN HASKETT, of 52, Wigmore Street, Cavendish Square, in the
County of Middlesex, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN GRINDING STONES AND WHETSTONES" to be as
follows:-
This Invention consists of a new composition, having for its object
the production of artificial stones for wheting and grinding.
This composition is thus obtained:-About of an once of natural
brown gum lake (the weight to be increased or diminished according

page_text: to the degree of hardness wished to be attained), to which is added a
small quantity of linseed oil, combined or not with litharge; other oils
may also be used. To this mixture must be added about 3 onces of
siliceous sand of the required degree of finoness; the whole mass must
be perfectly amalgamated, and can then be moulded into various shapes 5
suitable for wheting or grinding.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John laskett, in the Great Seal Patent Office,
on the 17th September 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, 1,
JOHN HASKETT, of 52, Wigmore Street, Cavendish Square, in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Ier
Letters Patent, bearing date the Eighteenth day of March, in the year
of our Lord One thousand eight hundred and fifty-three, in the six-
teenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Haskett, ler special licence
that I, the said John Haskett, my executors, administrators, and
assigns, or such others as I, the said John Haskett, my executors, ad-
ministrators, 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 communicated to me by a
foreigner residing abroad, for "IMPROVEMENTS IN GRINDING STONES AND
WHETSTONES," upon the condition (amongst others) that I, the said Joh
Haskett, by an instrument in writing under my hand and seal, 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.

page_text: NOW KNOW YE, that I, the said John Haskett, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement (that is to say):
Twenty-five parts of brown natural gum lac or stick lac are to be
melted by means of a suitable degree of heat, the liquefaction being
aided by the addition of a little lint oil, being adulterated with litharge
if thought desirable; then one hundred parts of siliceous sand, of the
requisite degree of fineness, are to be added, and the whole mixed
carefully together. More or less of the gum lac or stick lac may be
used, according to the degree of hardness desired.
By means of moulds, stones suitable for grinding fine cutlery, scythes,
tools, &c. &c., may be formed.
I claim the above described method of manufacturing grindstones
and whetstones.
In witness whereof, I, the said John Haskett, have hercunto set my
hand and seal, this Seventeenth day of September, in the year
of our Lord One thousand eight hundred and fifty-three.
JOHN HASKETT.
(L.S.)