IMPROVEMENTS IN. PROVISIONAL SPECIFICATION
Year: 1861

page_text: LETTERS PATENT to John Watt, of 35, Lorrimore Street, Walworth, in the
County of Surrey, Chemist, and Thomas Snaith Haviside, of 69, Cornhill,
in the City of London, Gentleman, for the Invention of "IMPROVEMENTS IN.
PROVISIONAL SPECIFICATION left by the said. John Watt, and Thomas
Snaith Haviside, at the Office of the Commissioners of Patents, with their
Petition, on the 29th October 1861.
We, JOHN WATT, of 35, Lorrimore Street, Walworth, in the County of
Surrey, Chemist, and THOMAS SNAITH HAVISIDE, of 69, Cornhill, in the City
of London, Gentleman, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF SOAP," to be as follows:-
This Invention relates to the manufacture of white soap, and pale yellow
soap from kitchen stuff, ship fat, and other similar inferior and dark colored
fat or grease. The fatty matter is converted into fat acids by any suitable
process. The fat acids are then distilled in the ordinary manner. The dis--
tilled fat acids thus obtained are introduced into any suitable vessel, and melted
with water and carbonate of soda (soda ash being preferred), in solution in
water added thereto until the disengagement of carbonic acid gas ceases.
The saponification is to be finished with caustic soda.

page_text: When pale yellow soap is to be made, rosin, is to be added to the dis-
tilled fat acids and alkali. The soap produced is to be finished in the usual
way.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Watt and Thomas Snaith Haviside in the Great Seal
Patent Office on the 29th April 1862,
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOHN WATT,
of 35, Lorrimore Street, Walworth, in the County of Surrey, Chemist, and
THOMAS SNAITH HAVISIDE, of 69, Cornhill, in the City of London, Gentleman,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of October, in the year of our Lord
One thousand eight hundred and sixty-one, in the twenty-fifth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto us, the said
John Watt and Thomas Snaith Haviside, Her special licence that we, the said
John Watt and Thomas Snaith Haviside, our executors, administrators, and
assigns, or such others as we, the said John Watt and Thomas Snaith Haviside,
our 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 "IMPROVEMENTS IN THE MANUFACTURE OF SOAP," upon
the condition (amongst others) that we, the said John Watt and Thomas
Snaith Haviside, our executors or administrators, by an instrument in writing
under our, 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 Thomas Snaith Haviside, on behalf of
myself and the said John Watt, do hereby declare the nature of our said Inven-
tion, and in what manner the same is to be performed, to be particularly des-
cribed and ascertained in and by the following statement, that is to say:
The said Invention relates to the manufacture of white soap and pale.
yellow soap from kitchen stuff, ship fat, and other similar inferior and dark
colored fat or grease, and consists in the application and use in the manu-

page_text: facture of white soap and pale yellow soap of the distilled fat acids obtained
from kitchen stuff, ship fat, and other similar inferior and dark colored fat
or grease.
And in order that the said Invention may be most fully understood, and
readily carried into effect, we will describe the mode or process which we
adopt for the purpose.
The fatty matter employed is converted into fat acids by any of the processes
well known, and usually adopted to effect that result. The fat acids thus
obtained are then distilled in the manner usually adopted for that purpose.
The distilled fat acids thus obtained are introduced into any suitable vessel
with water and melted, and carbonate of soda (soda ash being preferred), in
solution in water is added thereto until the disengagement of carbonic acid
gas ceases.
The saponification is to be finished with caustic soda. The soap
thus obtained will be white soap. When pale yellow soap is to be made
rosin is to be added to the distilled fat acid, and the carbonated and caustic alkali
added as already directed in the case of white soap. The soap produced is
to be finished in the usual way.
In witness whereof, I, the said Thomas Snaith Haviside, on behalf of
myself and the said John Watt, have hereunto set my hand and seal,
this Twenty-ninth day of April, in the year of our Lord One thousand
eight hundred and sixty-two.
THO. S. HAVISIDE.' (L.S.)