Year: 1897

page_text: Date of Application, 4th May, 1897-Accepted, 28th Aug.,
1897
I, OLIN HANSON BASQUIN, of No. 1410 Marquette Building, Chicago, Cook
County, State of Illinois, United States of America, Gentleman, do hereby declare
the nature of my invention, and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement: -
My invention relates to angle measuring devices and has for its object to provide
a new and improved device for measuring angles, of which the following is a
description, reference being had to the accompanying drawings, wherein
Figure 1 shows a side view of an angle measuring device embodying my
invention;
Figure 2 shows a modified form of angle measuring device;
Like letters refer to like parts throughout the several figures.
My present invention is particularly adapted to be used in connection with
prismatic lights. When windows are provided with prismatic lights, the dimen-
sions or angles of the prisms depend upon the angles at which the rays of
light strike the window and upon the angle at which it is desired to have
them leave the window. In cities or other places where there are high buildings,
the buildings on one side of the street shut off a portion of the light which would
otherwise fall upon the windows on the opposite side of the street. The angles
of the prisms to be used in any given window, when the angle at which the light
leaves the prisms in the window is known, may be ascertained, if the angle from
the horizon, subtended by the building or other obstacle which cuts off the lower
light is known. The object of my invention is to provide an angle measuring
device by which this angle can be easily and quickly ascertained.
Referring now to Figure 1 of the drawings, a sighting device or telescope A is
provided with a graduated scale or arc B movably connected thereto as by being
pivoted at B. This arc is provided with a projection B³. A spring B³ is inter-
posed between the telescope and the projection B and tends normally to force
said projection away from the telescope. An arm C is pivotally connected to the
telescope and is provided at its end with the indicating device C adapted to
swing along the arc B, the arm acting as a plumb line. The angle measuring
device is preferably used without a support, but it may be placed on any desired
support, as for example, the support D.
In Figure 2 I have indicated a modified form of my device. In this con-
struction, the graduated arc B is provided with the projecting arms B which
meet at the centre of the circle, of which the graduated arc is a portion, the whole
pivoted at B5 to the piece or arm D, having at its outer end the projection or
sight D. An arm D³ is placed at an angle to the arm D and is provided with the
point or sight D³. A pointer C is attached to the support and is adapted to
indicate the angle on the graduated arc B. The arm D³ is preferably pivotally
connected to the arm D or to some part connected therewith. As shown in the
drawings, said arm is provided with a pin D', which projects through a slot D³,
ID 77

page_text: in the support (, the whole arranged so that the arm D2 may be folded up when
not in use. The sights D and D³ may be so formed that a telescope may be placed
thereon as shown in dotted lines. This device is preferably used without a
telescope.
I have shown two forms of my device in order to more clearly illustrate my
invention, but it is evident that other constructions than the oues herein shown
may be used to obtain the result desired and I therefore do not wish to be limited
in any particular to the construction shown.
The use and operation of my invention are as follows:-
Referring to Figure 1, the graduated are B is normally forced against the
swinging arm C by the spring B³ thereby preventing the arm from moving.
When it is desired to ascertain the angle from the horizon subtended by any object,
as for example, a building, the telescope is pointed at the top of the building and
the graduated arc is moved by an upward pressure of the projection B so as to
free the arm C, which acts as a plumb line and moves along the graduated arc,
its position depending upon the angular position of the telescope. After the
telescope has been directed toward the top of the object, the graduated arc is
allowed to move so as to engage the swinging arm C and prevent its further move-
ment. The instrument may then be lowered and the desired angle read from the
graduated arc, the pointer C¹ indicating such angle.
When the device shown in Figure 2 is used, the line of sight is obtained by
the two sights D₁ and D³. As the arm D is moved the arc B swings around its
pivotal point and when the sights are directed at the top of the object, the angle
form the horizon subtended by the object will be indicated upon the arc B by the
pointer C¹.
It will be seen that I have here an angle measuring device which can be used
by any one and which needs no careful adjustment in order to correctly measure
tho angle.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
An angle measuring device as herein described adapted for the purposes specified.
……יי
CHR
này 1091.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.