An Improved Sheep Dip.
Year: 1891

page_text: Date of Application, 24th Nov., 1891
Complete Specification Left, 2nd Dec., 1091-Accepted. 13th Feb. 1892
PROVISIONAL SPECIFICATION.
An Improved Sheep Dip.
ALEXANDER ROBERTSON Manufacturing Chemist Oban, Argyleshire, N.B. do
hereby declare the nature of this invention to be as follows :-
It is a chemical combination of arsenic carbo cresylic oil carbolic acid, rosin,
grease and soda lye for the production of a paste soluble in hot water (carbo-
cresylic oil obtain as a distillate of coal tar it contains carbolic & cresylic
acids).
The proportions are arsenic parts carbo cresylic oil 25% 6 parts carbolic
acid 95% 2 parts rosin and grease 3 parts soda lye 1 parts.
The arsenic is boiled with the rosin and grease and soda lye to produce a state
of solubility in the arsenic without changing the character of that salt. (The word
arsenic used herein is meant to denominate arsenious acid.)
Dated this 21st day of November 1891.
ALEXANDER ROBERTSON.
COMPLETE SPECIFICATION.
An Improved Sheep Dip.
I, ALEXANDER ROBERTSON Chemist, Oban, Argyleshire do hereby declare
the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:--
27
This invention relates to the preparation of a paste freely soluble in four times
its bulk of boiling water, capable of use in that way for preparing a bath or "dip"
containing the full proportion of arsenic usually employed for a simple arsenical
dip " and also the full proportion of tar acids necessary for a simple carbolic
dip" for sheep.
66
$6
By means of the said paste a solution is made containing active insecticides in
the form of tar acids and arsenic, the tar acids having the effect of coagulating
albumen of which sheep's parasites are largely composed and the arsenic having a
continuous poisonous effect.
The composition of the paste is as follows:-
Arsenious acid
Carbo cresylic oil
Carbolic acid
Rosin and grease mixture
Soda lye
2 parts
-
6 parts
-
2 parts
-
3 parts
parts
The carbo cresylic oil is such as contains 25% of tar acids and the carbolic acid
such as contains 95% of tar acids.
The rosin and grease are melted to nearly boiling point, they are then treated
with part of the soda lye and they are all boiled together. The arsenic is dissolved
by strong heat in the remainder of the soda lye and, in the state of solution, is
added to the rosin and grease mixture. The whole is then boiled till completely
incorporated, the carbo cresylic oil and carbolic acid being then added and
the mixing completed by any simple means of stirring the compound which
when cool forms the improved paste for preparing sheep "dips" as hereinbefore
described.

page_text: The injurious effect on wool of the alkaline lye, necessarily added to the com-
pound for the purpose of dissolving the arsenic, is obviated by its combination with
the rosin and grease; and the arsenic being simply dissolved in the alkaline lye
and immediately diffused through the boiling mass of rosin and grease is not,
excepting perhaps in some insignificant degree, reduced to a soluble salt such as
arsenite of soda but retains its character as arsenious acid, its free solubility in
preparing the dip" being due to the minute state of division in the presence of
the other ingredients of the solution.
56
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
A paste for preparing a solution to be employed as a sheep dip consisting of
arsenious acid, carbo cresylic oil, carbolic acid, rosin, grease and soda lye combined
in the proportions and compounded in the manner substantially as described.
Dated this 14th day of January 1892.
AYRTON & THOMAS,
Agents for the Applicant.