An Engineer's Pocket Instrument for Gauging, Measuring, and Drawing.
Year: 1892

page_text: Date of Application, 19th Sept., 1892
Complete Specification Left, 19th June. 1893-Accepted, 19th Sept., 1893
PROVISIONAL SPECIFICATION.
An Engineer's Pocket Instrument for Gauging, Measuring,
and Drawing.
I GEORGE HENRY BRUCE of Number 10 Helena Street Smethwick in the
County of Stafford, Engineer, do hereby declare the nature of this invention to be
as follows:
·
This gauge is designed and intended to supply a want long felt in the engineering
trade. It consists of two unequal sized plates made preferably of steel united by
means of a screw or rivet which forms a centre on which they can be made to
turn. On the plates are impressed or engraved certain rules or measures both
English and foreign. One end of the smaller plate is semicircular in shape and
being attached to its fellow by the aforesaid screw or rivet, the rule thereon can
be seen and used either as a whole or in parts as required to set out angles of
various degrees or the segments of a circle. On two of the sides of the larger
plate are formed openings of various sizes which serve as gauges for the formation
of screw cutting tools whether the same are required for square or V threads.
addition to the above the gauge contains other useful and important gauges in
constant use and demand in the engineering trade.
Dated this 17th day of September 1892.
In
GEORGE HENRY BRUCE.
COMPLETE SPECIFICATION.
An Engineer's Pocket Instrument for Gauging, Measuring,
and Drawing.
I, GEORGE HENRY BRUCE of Number 10 Helena Street, Smethwick in the
County of Stafford, Engineer 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 :-
This gauge is designed and intended to supply a want long felt in the engineering
trade. It consists of two unequal sized plates made preferably of steel, united by
means of a rivet or screw which forms a centre on which they can be made to
turn. On the plates are impressed or engraved certain rules or measures, both
foreign and English. One end of the smaller plate is semicircular in shape and
being attached to its fellow by the aforesaid rivet or screw the engraving thereon
can be seen and used either as a whole or in parts as required to set out angles
of various degrees or the segments of a circle. On two of the sides of the larger
plate are formed openings of various sizes which serve as gauges for the formation
of screw cutting tools, whether the same are required for square or V threads.
In addition to the above the gauge contains other useful and important gauges
in constant use and demand in the engineering trade.
That the construction and use of my invention may be more clearly understood
I have attached hereto a sheet of drawings which I now proceed to explain.
Figs. A 1 and 2 are the two plates of which my gauge consists and which
are full size. The larger plate Fig. A 2 being furnished with an English rule
divided as therein shewn down to 64ths of an inch and also with several openings
on its sides which are hereinafter explained. The smaller plate Fig. A is a
sector of the ordinary form but somewhat enlarged so as to enable me to engrave
on it a French or other foreign rule. This enlargement serves another and
important purpose to be subsequently described.

page_text: Fig. B shews the gauge in its complete form, the two plates being united by
means of a rivet or screw which forms an axis on which the smaller plate can be
readily turned so as to bring its several parts into view as they may be required.
I use a screw in preference to a rivet which facilitates the separation of the plates
in order that, if desired, the sector may be separately employed for setting out
angles in the ordinary way.
Fig. C shews the plates united-the sector being partly turned on its axis so
that the side a. b. forms an angle with the side c. d. on the larger plate-the degrees
of such angle being indicated or registered on that portion of the sector which is
brought into view by its partial rotation on its axis and which is included between
the lines c and g and is marked with the letter ..
g
As before explained the sector is made in the ordinary form divided into 180°
which are marked thereon, but it is enlarged so as to admit of the engraving
thereon of a French or other foreign rule or measure. This enlarged portion is
separated from the semi-circular part by a line marked e. f. and when the sector is
turned so as to make this line coincide with that part of the larger plate marked h.
as shewn in Fig. B the lines a. b. and c. d. are at right angles with each other;
then by turning the sector on its axis these lines describe an angle of any required
number of degrees and which are indicated on the sector between e and g as
previously stated.
9.
The square openings on Fig. A 2 are gauges for the making of tools for cutting
screws with square threads-the number of threads to the inch being shewn against
the several openings.
The opening on the larger plate marked D is an angle of 75° and is suitable for
forming lathe centres-and those marked E, E, are angles of 55° for forming tools
for cutting screws with V threads.
The round holes down the middle of the larger plate are the size of drills for
tapping purposes varying from th to th of an inch as indicated on the plate.
Having now fully described the nature of my invention, the uses to which
its several parts can be applied and the construction thereof-1 declare that what
I claim is
An engineer's pocket gauge as hereinbefore described and which is specially
designed and intended to indicate and register the degrees or sizes of the angles
formed by the straight edges or sides of the plates respectively marked a. b. on
the sector and c. d. on the larger plate of the said gauge as shewn in Fig. C.
In witness whereof 1, the said George Henry Bruce, of 10 Helena Street,
Smethwick, in the County of Stafford, Engineer, have hereunto set my
hand this Seventeenth day of June 1893.
GEORGE HENRY BRUCE.