Improvements in Adjustable Levels for Photographic Camera Stands and for other like purposes.
Year: 1892

page_text: Date of Application, 15th Mar., 1892
Complete Specification Left, 15th Dec., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Levels for Photographic Camera Stands
and for other like purposes.
I, EDWARD MARTIN, of Ashby Road, Melbourne, in the County of Derby,
Photographer, do hereby declare the nature of this invention to be as follows:-
This invention relates to the manner in which I construct adjustable spirit levels
for application to tripod legs and stands for supporting cameras, for attaching to
the swing back of the camera and for other like purposes, whereby I am enabled
to readily determine the adjustment necessary for the true position of the legs
stand or camera in any direction, without disturbing the correctness of the position
in any other direction.
In carrying my invention into effect I construct a spirit level in the form of a
glass tube in the usual or well known ordinary manner, containing the air bubble
for observation purposes, and I mount this tube thus produced upon a frame or
within a case of metal or other suitable material to form a guard or protecting
shield for the glass tube. The frame or case I provide with a hinge or pivoted
joint at one end so that the tube with its guard can be readily moved round from
one position in one line, to any other position up to and beyond that of a right
angle.
By this arrangement I am enabled to first adjust the position of the stand tripod
or swing back of the camera in one direction and then by moving the tube outwards
upon its hinge or pivot to obtain and adjust the position of the legs stand or swing
back of the camera in any other direction.
Instead of mounting the tube at its outer end 1 sometimes form it with two
central pivots, or one central stem, upon which it may turn so as to revolve
completely round a circle and by this method to correctly level the stand or legs or
any other portion of the camera from the one movement of the level tube. I make
the case to carry the tube when arranged for a complete circular movement of such
a form that the level may pass right round within the top cover or head of the
frame; or I sometimes provide the frame with bars or connecting pieces at
intervals which will permit of a portion of a revolution only being made. I
make the cases of any desired form and I attach them to any convenient position
upon the camera, or upon the theodilite, or other instrument to which it may be
desirable to apply the same.
Dated this 14th day of March 1892.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Adjustable Levels for Photographic Camera Stands
and for other like purposes.
1, EDWARD MARTIN, of Ashby Road, Melbourne, in the County of Derby,
Photographer, 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 relates to the manner in which I construct adjustable spirit levels
for application to tripod legs and stands for supporting cameras for attaching to the
swing back of the camera and for other like purposes, whereby I am enabled to
readily determine the adjustment necessary for the true position of the
of the legs, stand
".

page_text: or camera in any direction, without disturbing the correctness of the position in any
· other direction.
In the accompanying sheet of explanatory drawings,
Figure 1 is an elevation and Figure 2 a sectional elevation, and Figure 3 a plan
of my improved level within its frame or case.
Figure 4 is a plan of my level with the tube portion opened out at right angles
to the case, and
Figure 5 is a side elevation corresponding to Figure 4 with the tube opened out
showing the case ready for attachment to the camera or other article.
Figure 6 is a plan and Figure 7 an elevation of my improved level having a
*complete circular swing for obtaining adjustment in any position.
Figure 8 is a plan showing my level arranged for levelling for positions where
the angles are beyond that of a right angle.
In carrying my invention into effect I construct a spirit level in the form of a
glass tube A in the usual or well known ordinary manner containing the air bubble a
for observation purposes, and I mount this tube A thus produced upon a frame or
within a case B of metal or other suitable material to form a guard or protecting
shield for the glass tube. The frame or case DI provide with a hinge or pivoted
joint C at one end so that the tube with its guard B can be readily moved round
from one position in one line to any other position up to and beyond that of a right
angle, as shown in Figure 8. The end 6' of the guard I make semi-circular to clear the
frame as at Figure 8, or when it is desired to level only up to a right angle I make
the ends 62 as shown at Figure 4.
By this arrangement I am enabled to first adjust the position of the stand tripod
or swing back of the camera in one direction and then by moving the tube outwards
upon its hinge or pivot to obtain and adjust the position of the legs, stand or swing
back of the camera in any other direction.
Instead of mounting the tube at its outer end I sometimes form it with two
central pivots, or one central stem E as shown in Figure 6 and Figure 7 which
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the case may turn so as to revolve completely round a circle and by this method
to correctly level the stand or legs or any other portion of the camera from the one
movement of the level tube.
I make the case or plate G to carry the tube when arranged for a complete
circular movement of such a form that the level may pass right round within or
over the plate or over the top cover or head of the frame; or I sometimes provide
the frame with bars or connecting pieces at intervals which will permit of a portion
of a revolution only being made. I make the cases or plates of any desired form
and I attach them to any convenient position upon the camera, or upon the
theodolite, or other instrument to which it may be desirable to apply the same.
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. The construction of levels for photographic and like levelling and adjustable
purposes in which the tube is enclosed within a case capable of turning upon a
hinge substantially as hereinbefore described and as illustrated on Figures 1,2,3,4,5
and 8 of the accompanying drawings.
2. The construction of levels for photographic camera levelling and for levelling
like tripods or stands for other purposes, in which a glass tube with its frame or
case can revolve completely or partially round a circle as hereinbefore described
- and as illustrated at Figures 6 and 7 of the accompanying drawings.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for the Applicant.