Chalk Unbreakable.
Year: 1885

page_text: Chalk Unbreakable.
I ALEXANDER BROWNE of 9 Southampton Buildings in the County of Middlesex
Patent Agent do hereby declare the nature of my Invention for "IMPROVEMENTS
IN PROCESSES FOR RENDERING BILLIARD AND WRITING CHALK UNBREAKABLE"
a communication to me by Adolph Hamann of the town of Grossenhain in
the Kingdom of Saxony and German Empire to be as follows:-
My invention relates to a process for rendering billiard and writing chalk
unbreakable, that is, to so treat the chalk cubes generally used for chalking
billiard cues, chalk for writing on blackboards and other purposes so that the
same are rendered unbreakable.
The frangibility and brittleness of the prepared chalk now employed for the
above named purposes has been long felt to be the greatest disadvantage the same
possesses and various schemes have been tried to overcome the difficulty for
instance by inserting the chalk in elastic covers of india rubber which are however
very inconvenient with billiard chalk and entirely prevent their being employed
for writing chalk.
This present invention renders it possible to treat the chalk in such manner
that the same is rendered fully unbreakable and will not peel or spring in cutting
so that the advantages obtained by employing my process will be evident to all.
The method of carrying my process into operation is as follows:-
The washed chalk is formed in suitable formers to suit the special purpose for
which it is intended and after the so formed pieces have become thoroughly dry
the same are coated on all sides with a very fluid oil varnish or boiled linseed or
other drying oil which is allowed to slowly dry in. This treatment is repeated
four or five times at intervals of about 24 hours which is necessary in order to
assure that the oil or varnish penetrates through the entire piece of chalk and
becomes intimately connected with the same..

page_text: The correct saturation can be at once detected in cutting the chalk by the
evident softness of the same which must be equal throughout the entire thickness
of the said chalk.
In order to retain this softness of the chalk I prefer to provide the same, after
their having been treated as above mentioned with a coating of shellac or other
suitable varnish.
COMPLETE SPECIFICATION.
Improvements in Processes for Rendering Billiard and Writing
Chalk Unbreakable.
I ALEXANDER BROWNE of 9 Southampton Buildings Holborn in the County of
Middlesex, Patent Agent do hereby declare the nature of my Invention for
"IMPROVEMENTS IN PROCESSES FOR RENDERING BILLIARD AND WRITING CHALK
UNBREAKABLE" a communication to me by Adolph Hamann of the town of
Grossenhain in the Kingdom of Saxony and German Empire, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
My invention relates to a process for rendering billiard and writing chalk
unbreakable, that is, to so treat the chalk cubes generally used for chalking
billiard cues, chalk for writing on blackboards and other purposes so that the same
are rendered unbreakable.
The frangibility and brittleness of the prepared chalk now employed for the
above named purposes has been long felt to be the greatest disadvantage the same
possesses and various schemes have been tried to overcome the difficulty for
instance by inserting the chalk in elastic covers of india rubber which are
however, very convenient with billiard chalk and entirely prevent their being
employed for writing chalk.
This present invention renders it possible to treat the chalk in such manner that
the same is rendered fully unbreakable and will not peel or spring in cutting so
that the advantages obtained by employing my process will be evident to all.
The method of carrying my process into operation is as follows:―
The washed chalk is formed in suitable formers or moulds to suit the special
purpose for which it is intended and after the so formed or moulded pieces have
become thoroughly dry the same are coated on all sides with a very fluid oil
varnish or boiled linseed or other drying oil which is allowed to slowly dry in.

page_text: This treatment is repeated four or five in intervals of 24 hours which is
necessary in order to assure that the oil or varnish penetrates through the entire
piece of chalk and becomes intimately connected with the same.
The correct saturation can be at once detected in cutting the chalk by the
evident softness of the same which must be equable throughout the entire
thickness of the said chalk.
In order to retain this softness of the chalk I prefer to provide the same, after
their having been treated as above mentioned, with a coating of shellac or other
suitable varnish.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. As a new article of manufacture cubes or other pieces of chalk for chalkening
billiard cues, writing and other purposes which are rendered unbreakable by
saturating such said chalk with fluid oil varnish or boiled linseed or other drying.
oil substantially as described.
2. The combination of the chalk, prepared as claimed under claim 1 with a
coating of shellac or other suitable varnish substantially as described.
Deted this 15th day of Doomben 100K