Improvements in or connected with the Manufacture of Gun-cotton or other Manufactures in which Cooling Water liable to become Acidulated is Employed.
Year: 1894

page_text: Date of Application, 21st Feb., 1894
Complete Specification Left, 7th Mar., 1894-Accepted, 5th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in or connected with the Manufacture of Gun-cotton
or other Manufactures in which Cooling Water liable to become
Acidulated is Employed.
We, EVERARD HESKETH and ALEXANDER MARCET both of 23 St. Swithin's
Lane in the City of London, Engineers do hereby declare the nature of our
invention to be as follows:-
In the manufacture of gun-cotton a quantity of water at a low temperature has
to be employed and as after use this water has not risen very greatly in temperature
in cases where the available initial water which has to be cooled is at a higher
temperature than that which has been cooled and used in the said manufacture it
is advantageous to subject the water which has been so used to the cooling process
to be used over again as the cooling water in the manufacture. This use of the
same water over and over again has however not been hitherto practicable on
account of acid which gets into it rendering it destructive to metal pipes or other
metal surfaces with which it comes into contact. To obviate this objection and
enable the same water to be used over and over again we make the water alkaline
by means of soda ash or other alkaline material so that acid which enters it will
be neutralized. In order to detect any tendency of the liquid to become acid by
reason of excess of acid entering it we propose to colour the liquid with a substance
such as blue litmus, which will, by changing colour, indicate the acidity of the
liquid and indicate that a further addition of alkali should be made.
The invention is more especially intended for use in the manufacture of gun
cotton but it may be used in other manufactures where cooling water liable to
acidulation employed.
Dated the 21st day of February 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMT DELE DI ECIFICATION.
Improvements in or connected with the Manufacture of Gun-cotton
or other Manufactures in which Cooling Water liable to become
Acidulated is Employed.
We EVERARD HESKETH and ALEXANDER MARCET both of 23 St. Swithin's
Lane in the City of London, Engineers, do hereby declare the nature of our
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
In the manufacture of gun-cotton a quantity of water, at a low temperature, has
to be employed, and as after use, this water has not risen very greatly in temperature,
in cases where the available initial water which has to be cooled is at a higher
temperature than that which has to be cooled and used in the said manufacture, it
is advantageous to subject the water which has been so used to the cooling process
Price 8d l

page_text: to be used over again as the cooling water in the manufacture. This use of the
same water over and over again has however not been hitherto practicable on
account of acid which gets into it rendering it destructive to metal pipes or other
metal surfaces with which it comes into contact. To obviate this objection and
enable the same water to be used over and over again we make the water alkaline
by means of soda ash, or other alkaline material, so that acid which enters it will
be neutralized. In order to detect any tendency of the liquid to become acid by
reason of excess of acid entering it we propose to colour the liquid with a substance
such as blue litmus, which will, by changing colour, indicate the acidity of the
liquid and indicate that a further addition of alkali should be made.
The invention is more especially intended for use in the manufacture of gun-
cotton but it may be used in other manufactures where cooling water liable to
acidulation is employed.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. In the manufacture of gun cotton or other manufactures in which cooling
water liable to become acidulated is employed the use of alkali with the said water
substantially as and for the purpose hereinbefore described.
2. In the manufacture of gun cotton or other manufactures in which cooling
water liable to become acidulated is employed the use of alkali and blue litmus
or the like with the said water substantially as and for the purpose hereinbefore
described.
Dated this 7th day of March 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.