IMPROVEMENTS IN THE MANUFACTURE OF BLACK LEAD
Year: 1884

page_text: I JOHN JOHNSON, of St Anne's Works St Anne Street Liverpool, in the County
of Lancaster, Black Lead Manufacturer do hereby declare the nature of my said
invention for IMPROVEMENTS IN THE MANUFACTURE OF BLACK LEAD to be as
follows:-
Black lead as at present supplied for polishing purposes is either prepared as a
powder or in hard blocks and each of these are objectionable, the first on account
of being easily blown and wafted about, causing dust and dirt, and the second as it
has to be reduced to a state of division before being used.
"
My invention is designed to produce an article, which shall not be open to either
of these objections.
In the course of the manufacture of the article when it has reached the state of
powder, I then add thereto in addition to water or mixed with water saccharine
matter of consistency to reduce the whole to a pasty condition, this is then taken
and forced through wire gauze with meshes arranged to suit the size of the particles
of the finished article.
:
By this means I produce in a granulated form an article better suited for the
purposes for which it is intended than when prepared in either of the ways above
mentioned.
I do not confine myself however to the use of saccharine matter for the purpose
of making a paste and causing the material to hold together in the granulated
form, as other gummy or sticky substances might be used but the above is what
I prefer:

page_text: I JOHN JOHNSON of St Anne's Works, St Anne Street Liverpool in the County
of Lancaster Black Lead Manufacturer do hereby declare the nature of the said
invention for "IMPROVEMENTS IN THE MANUFACTURE OF BLACK LEAD" and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Black lead as at present supplied for polishing purposes is either prepared as a
powder or in hard blocks, and each of these are objectionable, the first on account
of being easily blown and wafted about causing dust and dirt, and the second as it
has to be reduced to a state of division before being used.
My invention is designed to produce an article which shall not be open to either
of these objections.
The processes in the manufacture of the black lead are carried on in the usual
manner until in the course of the manufacture, it has reached the state of powder.
I add thereto in addition to water or mixed with water saccharine matter of
consistency to reduce the whole to a pasty condition, this is then taken and forced
through wire gauze with meshes arranged to suit the size required for the particles
of the finished article.
By this means I produce in a granulated form preparations of black lead better
suited for the purposes for which it is intended than when prepared and finished in
either of the forms above mentioned.
I do not confine myself however to the use of saccharine matter for the purpose
of making a paste and causing the material to hold together in the granulated
form, as a gummy or other substance might be used but the above is what
I prefer.
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:
1st. As a new article of manufacture a preparation of black lead in granular
form, substantially as and for the purposes described.
2nd. The process substantially as herein.described, in the manufacture of black
lead, consisting of treating the material after it has been reduced to a state of
powder with a saccharine gummy or other substance until it assumes a pasty
condition, and then forcing it through meshes causing it to separate into a
granulated form.
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