Year: 1886

page_text: Date of Application, 30th Mar., 1886.
Complete Left, 29th Dec., 1886.
Complete Accepted, 1st Feb., 1887
I, GILBERT MCPHERSON Junior of Barskimming Hone Quarries, Stair, in the
County of Ayr, Whet Stone Manufacturer do hereby declare the nature of this
invention to be as follows:-
In preparing hone stones for use in, polishing calico-printers' rollers, lithographic
stones and the like, difficulties are experienced owing to the presence in the stone
slabs of hard gritty particles which are apt to scratch the surfaces acted on, and of
soft portions which are rapidly ground down while the stones are also liable to split in
the lines of cleavage or stratification. This invention has for its object to obviate or
overcome these difficulties and to avoid the waste and loss occasioned by the rejection
of such gritty stones, also to utilize the smaller pieces of stone which largely occur in
the quarries or into which the stone is broken in the quarrying operation and there-
from to obtain slabs or stones of the requisite size free from flaws and of homogeneous
structure or uniform character as regards hardness and grinding or polishing action.
I produce composite stones or slabs by joining and binding together a number of
small stones or pieces of like quality and bringing their acting surfaces to a uniform
level by cutting grinding or otherwise. The jointing and binding together of the
pieces of stone may be effected in various ways as for example in a manner similar to
that practised in forming large wood blocks for engraving, suitable cementing material
capable of withstanding the action of water and dowel pins being used when necessary,
or by binding bolts or rings of metal, or by the use of a backing of cement or other
binding inaterial. The pieces of stone are by preference bound together with the line
of cleavage in each block at right angles or at an inclination to the acting face of the
finished stone in order that the binding bolts or bands may serve to prevent any
tendency to splitting which would be apt to occur were the lines of cleavage parallel
to the acting face.
CRUIKSHANK & FAIRWEATHER,
Glasgow, Agents.

page_text: I, GILBERT MCPHERSON, Junior of Barskimming Hone Quarries, Stair in the
County of Ayr, Whet Stone Manufacturer, 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 :-
In preparing hone stones for use in polishing calico-printers' rollers or lithographic
stones and the like, difficulties are experienced owing to the presence in the stone
slabs of hard gritty particles which are apt to scratch the surfaces acted on and of
soft portions which are rapidly ground down, while the stones are also liable to split
in the lines of cleavage or stratification. This invention has for its object to obviate
or overcome these difficulties and to avoid the waste and loss occasioned by the
rejection of such gritty stones, also to utilize the smaller pieces of stone which largely
occur in the quarries or into which the stone is broken in the quarrying operation and
therefrom to obtain slabs or stones of the requisite size free from flaws and of
homogeneous structure or uniform character as regards hardness and grinding or
polishing action. I produce composite stones or slabs by joining and binding together
a number of small stones or pieces of like quality and bringing their acting surfaces
to a uniform level by cutting, grinding or otherwise. The jointing and binding
together of the pieces of stone may be effected in various ways as for example in a
manner similar to that practised in forming large wood blocks for engraving, suitable
cementing material capable of withstanding the action of water and dowel pins being
used when necessary, or by binding bolts or rings of metal or by the use of a backing
of cement or other binding material.
The accompanying drawing shows one form of the improved hone stone for
polishing, the stone being composed of small slabs or pieces A, carefully faced and
united by cementing material and bound together by a bolt B, passing through the
centre of the slabs. The pieces of stone are by preference bound together with the
line of cleavage in each block at right angles, or at an inclination, to the acting face
of the finished stone in order that the binding bolts or bands may serve to prevent
any tendency to splitting which would be apt to occur were the lines of cleavage
parallel to the acting face.
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 :-
A hone stone for polishing composed of a number of slabs or pieces united together
and whereby homogenuity in the structure is obtained substantially as set forth.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.