A New or Improved Instrument for Measuring and Setting Off . Ang
Year: 1894

page_text: Date of Application, 22nd Feb., 1894-Accepted, 5th May, 1894
COMPLETE SPECIFICATION.
A New or Improved Instrument for Measuring and Setting Off
. Angles.
FREDERICK WILLIAM KENT, 23, Outram Street, Copenhagen Street
Caledonian Road, London, N. Marqueterie Cutter, 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 constructing an instrument as entitled above, two flat bars, A, and B, are.
hinged together by a projecting hinge C, which enables both bars to be flat on
the work, and also admits of measuring, marking, and testing the accuracy of
angles to the extreme point. The bar A, is made narrow at D, to allow the other
bar to be brought down in a straight line with it, which admits of a complete
semicircle being made, and the bar B, is made wider at the end E, than the corre-
sponding width of the bar, as shown. The ends F, of the projecting hinge C, are
fixed, one on each bar, which must be in a proper position so that the centre of the
rivet G, (by which the hinge is fastened together) is exactly opposite the corner
points H, on each bar, so that when the bar B, is moved backwards, and forwards,
the same points will maintain their position perfectly true with each other. On
the bar B, is fixed (by one end) a semicircular plate I, having correct divisions
of all degrees from 0, to 180, right and left engraved, or otherwise. The same
degrees can be divided into halves, quarters, or more divisions if possible. A
semicircular slot J, is made in the divided plate to allow it to move freely over the
thread (fixed on the bar A) of the thumb-screw K, by which means, the apparatus
can be set to any angle and prevented from slipping out of the desired place...A
small projecting head L, is fixed on the bar A, at the, end to prevent the narrow
rim of the divided plate from bending out when screwing up with the thumb-
screw K.
A pointer M, is fixed on the same bar, having its point in a a straight
line with the edge N, of the bar A, to indicate the degree required. Two bayonet
notches O, are made in the bar A, to allow of a detachable fence P, being fixed
on same. On the bar B, is a flat shaped fastener Q, fixed by one rivet, and
sufficiently tight to prevent it from moving round of its own accord, by which
means, the two bars can be fastened together by allowing the projecting part to
come under the thumb-screw |R, and screwing the same tight, in this way the
instrument is protected from being injured when not in use. Should any degrees
be required higher than 180° already stated, it will be necessary to mark a line or
two points on the work, and by placing the inner edge N, of the bar A, on or
against the line or points the desired degree can be obtained, by adding an
additional half circle of degrees, graduating from 180° to 360° on the divided
plate, if the plate is made a little wider. Parallel section angle lines can be
made either by using the fence, or placing the straight edge U, against a fixed
Tsquare.
Fig. 1, illustrates the angle instrument complete, and the detachable fence is
shown by the dotted line on the bar A. The fastener Q, is thrown back.
Fig. 2, is a portion of the instrument with bevel edges S, and shows how the
projecting hinge C, is fixed. The hinge ends F, do not close together like those
in Fig. 1, but are made wide apart, so that they can be fixed on the upper flat part
of the bars; by this means, the bevel edges are free from obstruction. The degrees
are finished on the bevel as shown.
Fig. 3, is the longitudinal side view of the apparatus when closed, and shows the
position of the projecting hinge C.

page_text: Fig. 4, is the detachable fence with a projecting head T, and the milled thumb
screw R, which is fixed on the bar A, by the bayonet-notches O, and is also secured
by the thumb screw R.
The object of the fence is to allow the same being placed against the edge of a
drawing board or other straight articles, and for setting off angles on same.
Figs. 5, and 6, shew a portion of the two bars at the end with the fastener Q,
showing how they are secured together.
Figs. 7, and 8, shew the cross-section of the bars, and fence when closed, and
also the section of the thumb screw R. Fig. 2, can have a fence (by the same
arrangement as described above) on the bar B, with the edge X, of the fence to
come edge to edge with that of W. The edge X, of the fence can also be made
to come edge to edge with that of N, on the bar A, in Figs. 1, and 2, by having
another step made in each of the bayonet notches, or by making the fence wider.
The reason for having a fence on the bar B, in Fig. 2, is to allow the instrument
to have square edges for testing or measuring the range of block angles.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. Having the two flat bars either with bevel, or square edges hinged together
by the projecting hinge C, thus allowing both bars to lie flat on the work, and
admit of measuring, marking, and testing angles to the extreme point, as
described.
2. The semicircular divided plate fixed (by one end) on the bar B, with the
semicircular slot for the thread of the thumb screw K, by which the divided plate
is adjusted and prevented from slipping out of the desired place, and having the
projecting head fixed on the bar A, to prevent the rim of the divided plate from
bending out when screwing up with the said thumb-screw, as set forth.
3. Having on the bar A, a pointer to indicate the degree of an angle required,
and having the bayonet notches O, for the fence, as described.
4. The fastener Q, on the end of the bar B, for securing the two bars together
when not in use, as described.
5. Having the detachable fence to fix on the bar A, and if desired on the
bar B, by arrangements as set forth.
Dated this 22nd day of February 1894.
FREDERICK WILLIAM KENT.