Improvements in Spirit Levels or Clinometers.
Year: 1890

page_text: Date of Application, 14th Oct., 1890-Accepted, 13th Dec., 1890
COMPLETE SPECIFICATION.
Improvements in Spirit Levels or Clinometers.
1, HENRY GREEN, of Salisbury, in the County of Litchfield, and State of
Connecticut, United States of America, Inventor, 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 invention has relation to improvements in spirit-levels or clinometers and it
has for its object to provide means for indicating the point of the bubble at any desired
angle of inclination or level.
The invention will be fully understood from the following description and claims
when taken in connection with the accompanying drawings, in which
--
Fig. 1 is a side view of a level with my improvements applied and the stock or body
portion partly broken away.
Fig. 2 is a transverse vertical sectional view.
Fig. 3 is a view of the glass removed, and,
Fig. 4 is a view of the indicator removed.
Referring by letter to the said drawing, A, indicates the stock or body of a level,
which may be of any ordinary or approved construction. This stock or body portion
is provided about midway of its length and on opposite sides with recesses a, which
are of a semi-circular or curvilinear form to correspond with the shape of the glass,
and which are designed to expose the glass from opposite sides of the level and
also the spirit therein.
The body or stock of the level is provided at the inner end of one of the recesses a,
with a groove b, to seat the glass and the said glass may be secured in position by
plaster-of-paris or other.suitable material.
Secured to one side of the body A, is a plate B, which is provided with a semi-
circular slot d, corresponding in outline to that of the glass. This plate is suitably
graduated as shown.
Cindicates the glass carrying the bubble and spirit. This glass which is of a semi-
circular or curvilinear form is designed to be seated in the body of the level so that it
can be viewed from opposite sides of the stock, as better shown in Fig. 2 of the
drawing.
and
D indicates a pointer or indicator. This indicator is of a peculiar construction,
being held at its lower end to the plate or body of the stock by a pivot screw
its opposite side or upper end is provided with an eye f, so that when the bubble in
the glass reaches a point coincident with the eye it may be seen from either side of
the fovel. This indicator is also provided at a suitable point below the eye with a slot
or aperture, which is designed to expose to view the marks or graduations upon the
plate B.
This device is cheap in construction, it is durable and is effective in operation.
In operation, it will be seen that the indicator may be moved to any desired point
upon the graduated plate so as to expose to view from the slot g, therein. the number
over which it is placed. Therefore, when the hubble has come to a poin: within the
eye of the indicator, it will show the angle of the surface upon which the level is laced
and I attach importance to the fact that the level may be used from either side it being
simply necessary to set the indicator at the angle desired.
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. As an improved article of manufacture, a spirit-level having sight apertures on
opposite sides leading to the bubble, a graduated plate on one side of the bulb and a

page_text: pivoted indicator adapted to move over the graduated plate and having an eye to
expose to view the bubble or spirit, substantially as specified.
2. In a spirit-level, the combination with the stock or body, having sight apertures
in opposite sides leading to the bubble, of a pivoted indicator having an eye at one
end to expose to view therein, the bubble or spirit, substantially as specified.
3. In a spirit-level, the combination with the stock or body having a curvilinear
recess in one of its side walls leading to the bubble of the bulb or glass arranged
in said recess and a pivoted indicator having an eye at one end whereby the bubble
may be exposed to view therein, substantially as specified.
4. In a spirit-level, the combination with the body having a curvilinear recess, a
bulb or glass arranged at the inner end of said recess, a graduated plate having a
slot conforming to the shape of the bubble and recess and a pivoted indicator having
an eye adapted to expose to view the bubble and a slot or aperture to expose to view
the graduations on the plate substantially as specified.
Dated this 14th day of October 1800.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.