Rendering more effective Lead-thiosulphate as Constituent Part for Priming or Firing Compounds.
Year: 1898

page_text: Date of Application, 29th Jan., 1898
Complete Specification Left, 25th Oct., 1898-Accepted, 3rd Dec., 1898
PROVISIONAL SPECIFICATION
Process for Rendering more effective Lead-thiosulphate as
Constituent Part for Priming or Firing Compounds.
We, EUGEN GUROVITS, of I Auerspergstrasse, No. 4, Vienna, Austria, Gentle-
man, and Max BALS, of VII Lerchenfelderstrasse, No. 141, Vienna, Austria,
Chemist, do hereby declare the nature of this invention to be as follows:
Those priming or firing compounds whose utility depends upon the presence
of lead-thiosulphate (in particular the so called non-poisonous ones on account of
their containing no yellow phosphorus) are all subject to the following defects:
1, explosive nature of the mass, 2, rapid burning away before giving a useful
action, and 3, difficulty in obtaining a uniformly good result.
These defects are caused by the fact that owing to the composition of the
various priming masses, in particular those which contain no yellow phosphorus
and are nevertheless ignitable on all sides, certain of the constituents of the com-
pounds are present in large quantities while others are only present in very small
quantities, and that consequently the incorporation of these by means of the usual
mixing and grinding operation can only be imperfectly effected.
These defects are avoided by the process forming the subject of the present
invention, which consists in combining the lead-thiosulphate with potassium
bichromate, before mixing with the binding materials, in a manner which cannot
be effected by the usual mechanical mixing process. The combination is effected
as follows:-
To 100 parts by weight of lead-thiosulphate and 50 parts potassium bichromate
are added 150 to 200 parts of water, or an equivalent quantity of steam, thus
obtaining a compound the perfect nature of which is indicated by the spontaneous
heating thereof.
For perfecting the compound it is evaporated to dryness, preferably slowly; a
certain degree of moisture can however be allowed to remain.
The combination can also be effected by adding the lead-thiosulphate to the
dissolved potassium bichromate, and then evaporating the excess of water.
The solution of the potassium bichromate is effected either directly in water, or
by treatment with steam, the water of condensation of which effects the solution
of the bichromate.
It is advisable to add some or all of the other ingredients of the priming mass
to the above mixture, before evaporating, and then to evaporate the water from
the whole.
Dated this 29th day of January 1898
ABEL & IMRAY,
Agents for the Applicants.

page_text: Process for Rendering more effective Lead-thiosulphate as
Constituent Part for Priming or Firing Compounds.
We, EUGEN GUROVITS, of I Auerspergstrasse, No. 4, Vienna, Austria, Gentle-
man, and Max BALS, of VII Lerchenfelderstrasse, No. 141, Vienna, Austria,
Chemist, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement;-
Those priming or firing compounds whose utility depends upon the presence
of lead-thiosulphate (in particular the so-called non-poisonous ones on account of
their containing no yellow phosphorus) are all subject to the following defects:
1, explosive nature of the mass, 2, rapid burning away before giving a useful
action, and 3, difficulty in obtaining a uniformly good result.
These defects are caused by the fact that owing to the composition of the
various priming masses, in particular those which contain no yellow phosphorus
and are nevertheless ignitable on all sides, certain of the constituents of the com-
pounds are present in large quantities while others are only present in very small
quantities, and that consequently the incorporation of these by means of the usual
mixing and grinding operation can only be imperfectly effected.
These defects are avoided by the process forming the subject of the present
invention, which consists in combining the lead-thiosulphate with potassium
bichromate, before mixing with the binding materials, in a manner which cannot
be effected by the usual mechanical mixing process. The combination is effected
as follows:-
To 100 parts by weight of lead thiosulphate and 50) parts potassium bichromate
are added 150 to 200 parts of water, or an equivalent quantity of steam, thus
obtaining a compound the perfect nature of which is indicated by the spontaneous
heating thereof.
For perfecting the compound it is evaporated to dryness, preferably slowly; a
certain degree of moisture can however be allowed to remain.
The combination can also be effected by adding the lead-thiosulphate to the
dissolved potassium bichromate, and then evaporating the excess of water.
The solution of the potassium bichromate is effected either directly in water, or
by treatment with steam, the water of condensation of which effects the solution
of the bichromate.
It is advisable to add some or all of the other ingredients of the priming mass
to the above mixture, before evaporating, and then to evaporate the water from
the whole.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
claim is:-
1. Process for rendering more effective lead-thiosulphate as constituent part of
priming compounds, consisting in producing an intimate mixture of the lead
thiosulphate with potassium bichromate before admixture with the binding
materials, by first treating the said ingredients with water or steam, and then
entirely or partially evaporating the water from the solution obtained, substan-
tially as described.
2. In the process referred to in the first claim the method of first dissolving
the potassium bichromate in water, and then adding the lead thiosulphate, sub-
stantially as described.

page_text: 3. In the process referred to in the first and second claims, the method of
adding some or all of the other ingredients of the priming compound to the
solution of the potassium bichromate and lead thiosulphate before evaporating
the water therefrom, substantially as described.
Dated this 25th day of October 1898.