Year: 1886

page_text: Date of Application, 18th Mar., 1886.
Complete Left, 17th Dec., 1886.
Complete Accepted, 22nd Feb., 1887.
I WILLIAM EDWARD CONSTABLE of 40 King William Street, in the City of London,
Manufacturer and Contractor do hereby declare the nature of this invention to be as
follows:-
My invention relates to the manufacture of artificial asphalt, and its object is to
produce a material well adapted for the laying of roadways, footpaths, and the like.
The process of manufacture is simple and cheap and the asphalt formed is hard,
tenacious, and elastic.
According to my invention I use hard limestone, preferably Derbyshire limestone,
crushed by edge runners or other suitable machinery to a convenient size. This
material is then heated on hot plates or in any other convenient way to say about 120°
or 130° Fahrenheit in order to eliminate all moisture therefrom and to make it as
absorbent as possible. This crushed limestone is then mixed with refined distilled tar,
the greasy
and other extraneous material contained therein and calculated to affect
adhesive substances, being extracted therefrom, such as oil, creosote and water. The
material thus prepared should be stored for about three months and this forms the
base of the material.
When it is required to make the artificial asphalt according to my invention, I mix
the base material prepared as aforesaid, with bitumen, lime and acid such as sulphuric
acid, and to one ton or cubic yard of stone prepared as aforesaid I find that about 12
gallons of the distilled tar prepared as above should also be added. The proportion of
Bitumen may be 8 per cent, Lime 10 per cent and acid 2 per cent.
The composition should be laid cold and coated preferably with ground spa.

page_text: I WILLIAM EDWARD CONSTABLE of 40 King William Street in the City of London,
Manufacturer and Contractor 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 :-
My invention relates to the manufacture of artificial asphalt, and its object is to
produce a material well adapted for the laying of roadways, footpaths, and the like.
The process of manufacture is simple and cheap and the asphalt formed is hard,
tenacious and elastic.
According to my invention I use hard limestone, preferably Derbyshire limestone,
crushed by edge runners or other suitable machinery to a convenient size. This
material is then heated on hot plates or in any other convenient way to say about
120° or 130° Fahrenheit in order to eliminate all moisture therefrom and to make
it as absorbent as possible. This crushed limestone is then mixed with refined distilled
tar in or about the approximate proportions of crushed Limestone 1 ton, Distilled tar
12 gals (first mixing) the greasy and other extraneous material contained therein
and calculated to affect adhesive substances, being preferably extracted therefrom
such as oil, creosote and water. The material thus prepared should be stored for about
three months and this forms the base of the material.
When it is required to make the artificial asphalt according to my invention I mix
the base material prepared as aforesaid with bitumen lime and acid such as sulphuric
acid. The approximate proportion of the above materials may be, for one ton, 1 cwt.
Lime, 56 lbs. Bitumen, 1 Gall Sulphuric Acid, and to one ton or cubic yard of stone
prepared as aforesaid I find that about 12 gallons of the distilled tar prepared as
above should also be added. The proportion of bitumen may be 8 per cent, Lime
10 per cent and acid 2 per cent.
The composition should be laid cold and coated preferably with ground spa.
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 :-
In the manufacture of artificial asphalt, the base material composed of limestone
and distilled tar each being prepared and mixed substantially as described, in combi-
nation with bitumen, lime and acid prepared, treated and combined with the base
material aforesaid substantially in the manner hereinbefore described.
BREWER & SON,
For the Applicant.