Improvements in Guides for Stems of Gravitation Stamps.
Year: 1888

page_text: Date of Application, 17th Dec., 1888
Complete Specification Left, 13th July, 1889-Accepted, 17th Aug., 1889
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JAMES GRAHAM ALLEN, Engineer, Post Office Box ·
No. 149, Johannesburg, Transvaal, South Africa.]
Improvements in Guides for Stems of Gravitation Stamps.
JOHN WILLIAM THAOKERAY 207 Cardigan Lane, Headingley near Leeds, Clerk,
do hereby declare the nature of this invention to be as follows:-
The manufacture and use of guides for the stems of gravitation stamps made of
paper or compressed vegetable pulp.
Dated this 15th day of December 1888.
COMPLETE SPECIFICATION.
Improvements in Guides for Stems of Gravitation Stamps.
I, JOHN WILLIAM THACKERAY, of 207 Cardigan Lane, Headingley near Leeds,
Clerk, 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 stamping mills as heretofore ordinarily constructed, the stems or rods to which
the stamps are secured, are arranged to work in guides made of wood. In practice
these wooden guides are found to split, and to necessitate the use of lubricant such as
oil, which finding its way into the stamp box, becomes mixed with the ore therein
and prevents the effectual removal of gold from the oro by the process of amalgama-
tion to which the ore is afterwards subjected. Guides have also been constructed with
Babbitts metal, but this has not been found satisfactory owing to particles of such
metal or alloy removed by friction of the stamp stems or rods, entering the stamp
box and interfering with the subsequent amalgamation process.
Now in order to obviate the above mentioned evils I use guides made of compressed
paper prepared from any suitable vegetable pulp such as is ordinarily used in the
manufacture of paper.
Referring to the annexed sheet of illustrative drawings.
Fig. 1 is an elevation of the upper part of so much of a five stamp-mill as is
necessary to illustrate this invention.
Figs. 2, 3 & 4 are respectively a plan, an end view, and a side elevation of one of
the guides.
1 is the upper of two guides in which the stems or rods 2 of the stamps work; it
is secured to the side standards 3 of the mill in any suitable manner as well under-
stood. These guides are made from paper or vegetable pulp which is compressed in
suitable moulds to the desired form and density with holes for the stems or rods 2 to
work in. Each guide may be made in one piece or be built up as shown in
Figs. 12 and 3 where one half of the guide is shown as made of one longitudinal
piece, the other half being composed of a number of parts to be secured to the first
mentioned half by bolts and nuts 3ª as shown in Fig. 1.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. Guiding the stems of gravitation stamps by means of guides made from paper
LI

page_text: 2. The manufacture of guides for the stems of gravitation stamps from paper or
vegetable pulp pressed to the required form as hereinabove described.
Dated this 12th day of July 1889.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.