IMPROVED COMPOUND OR PREPARATION TO BE EMPLOYED IN THE FINISHING OR SURFACING OF PRINTING ROLLERS AND BLOCKS AND FOR CLEANING FINISHING OR SURFACING OTHER ARTICLES OR SURFACES
Year: 1884

page_text: I ALFRED BARRETT of 459 Bethnal Green Road in the County of Middlesex,
Designer and Printing Block and Roller Maker do hereby declare the nature of the
said Invention for AN IMPROVED COMPOUND OR PREPARATION TO BE EMPLOYED
IN THE FINISHING OR SURFACING OF PRINTING ROLLERS AND BLOCKS AND FOR
CLEANING FINISHING OR SURFACING OTHER ARTICLES OR SURFACES to be as
follows:-
Heretofore emery wheels and lumps of pumice stone have been employed in
finishing or surfacing printing rollers and blocks but the former has been found to
leave the surfaces with burrs and not otherwise as smooth as is desired whilst-thé
latter by their irregular and awkward shapes have been difficult of use and have
consequently produced uneven work.
According to my present Invention am enabled to produce a perfectly smooth
surface, free from burrs and to form blocks of material of any required dimensions
and shape.
For this purpose I take pumice stone broken into small pieces or powdered and
mix therewith a sufficient quantity of cement to agglomerate the same into a solid
mass which may be moulded into any required shape.
I have found plaster of Paris to be a suitable cement for the above purpose
but other materials may be employed provided they have the requisite binding
properties without being too harsh or gritty.
In finishing or surfacing printing blocks or rollers I first prepare the surfaces
thereof by an emery wheel, by filing or by other means and then finish the same by
means of a block of material manufactured as above described.
Dated 100L
1004

page_text: Í ALFRED BARRETT of 459 Bethnal Green Road in the County of Middlesex,
Designer and Printing Block and Roller Maker do hereby declare the nature of the
said Invention for AN IMPROVED COMPOUND OR PREPARATION TO BE EMPLOYED
IN THE FINISHING OR SURFACING OF PRINTING ROLLERS AND BLOCKS AND FOR
CLEANING FINISHING OR SURFACING OTHER ARTICLES OR SURFACES and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:―
Heretofore emery, wheels and. lumps of pumice stone have been employed in
finishing or surfacing printing rollers and blocks, but the former has been found to
leave the surfaces with burrs, and not otherwise as smooth as is desired whilst the
latter by their irregular and awkward shapes have been difficult of use and have
consequently produced uneven work.
According to my present Invention I am enabled to produce a perfectly smooth
surface free from burrs, and to form blocks of material of any required dimensions
and shape.
For this purpose I take pumice stone broken into small pieces or powdered, and
mix therewith a sufficient quantity of cement to agglomerate the same into a solid
mass which may be moulded into any required shape.
I have found plaster of Paris to be a suitable cement for the above purpose
but other materials may be employed, provided they have the requisite binding
properties without being too harsh or gritty.
In practice I employ a mixture of plaster of Paris and powdered pumice-stone in
equal proportions by bulk mixed with water sufficient to reduce the compound to
the consistency of thick cream.
This preparation I employ as a cement which I mix with the broken or powdered
pumice stone in quantity sufficient to agglomerate the same into a solid mass which
I mould into blocks or bricks of convenient size and shape.
In finishing or surfacing printing blocks or rollers, I first prepare the surfaces
thereof by an emery wheel, by filing or by other means and then finish the same
by means of a block of material manufatured as above described.
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 the improved compound or preparation consisting of broken or powered
pumice-stone agglomerated into a solid mass by means of a suitable cement
substantially as herein described and for the purpose stated.
T
ALFRED
BARRETT.
By Harris & Mills,
23; Southampton Buildings,
Agents.