AN IMPROVED EMERY WHEEL FOR GRINDING, POLISHING, AND DECORTICATING
Year: 1883

page_text: LETTERS PATENT to Thomas West of the Bromley Engine Works Devons
Road, Bromley-by-Bow. London. E. Engineer: for an Invention of "AN
IMPROVED EMERY WHEEL FOR GRINDING, POLISHING, AND DECORTICATING "
PROVISIONAL SPECIFICATION left by the said Thomas West at the Office
of the Commissioners of Patents on the 15th March 1883.
THOMAS WEST of the Bromley Engine Works. Devons Road, Bromley-by-Bow.
London. E. Engineer. "AN IMPROVED EMERY WHEEL FOR GRINDING, POLISHING,
AND DECORTICATING
"
The improved emery wheel according to my Invention consists of a composition,
the component parts of which are as follow:-namely Emery powder; Hydro-
chloric Acid; Magnesian limestone; Sand; Iron pyrites, Alum, Saltpetre, and
water, in the respective proportions to be defined in my Final Specification. These
several items are thoroughly combined, assimilated together, and afterwards
compressed and moulded into the desired shape or configuration..

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas West in the Great Seal Patent Office on the 13th September
1883.
THOMAS WEST of the Bromley Engine Works, Devons Road, Bromley-by-Bow
London. E. Engineer. "AN IMPROVED EMERY WHEEL FOR GRINDING, POLISHING
AND DECORTICATING."
The improved emery wheel according to my invention consists of a composition,
the component parts of which are as follow: namely, emery powder 60 parts;
sand or other suitable siliceous powder, 5 parts; alum 20 parts; saltpetre 4 parts;
pulverized magnesian limestone 5 parts; dilute hydrochloric acid 5 parts; iron
pyrites 1 part. The whole is then combined together until the compound reaches
a proper consistency. The combining, assimilating and mixing together of the
several ingredients may be effected in any convenient manner. The resultant
mass when thoroughly incorporated together is placed in dies or otherwise, and
moulded (preferably by the aid of hydraulic pressure) into the form of wheels, or
into other shapes or configurations which may be best adapted for the particular
intended application of the said compounded, moulded and pressed material.
As an alternative composition to that formulated above I also find in practice
that the following may be adopted and used preferably for certain applications.
In making this latter composition I proceed as follows:-I take 100 per cent of
emery powder and thoroughly combine and commingle therewith 25 per cent of
pulverized magnesian limestone; and also add a mixture of dilute hydrochloric
acid which has been previously neutralized with pulverized magnesian limestone;
the mixing together and pressing into shape being carried out as stated in-the last
preceding paragraph. In addition to this latter composition being found preferable
in certain cases, it also has the advantage of dispensing (as will be observed) with
the necessity for the introduction of the alum, saltpetre and iron pyrites included
in the composition herein first described.
I wish it to be understood that I have used in my Title and Provisional
Specification and in this the Final Specification of my said invention, the term
emery wheel" in the generally well known and widest accepted sense of the
same as designating a substitute for the natural stones used for all purposes of
grinding, polishing and decorticating." And that what I claim is: The manu-
facture of " 'emery wheels" (as defined above) consisting of the amalgamated
materials herein enumerated in or about the, proportions substantially as and for
the purpose or purposes hereinbefore described.
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In Witness whereof I the said Thomas West have hereunto set my band and
seal this eleventh day of September in the year of our Lord one thousand eight
hundred and eighty three.