Improved Levelling Staff used in Surveying 1425 water
Year: 1898

page_text: ...
Date of Application, 18th Oct., 1898~··
Complete Specification Left, 18th Aug., 1899-Accepted, 14th Oct., 1899
A.
PROVISIONAL SPECIFICATION
An Improved Levelling Staff used in Surveying
1425
water
22554
I, ARTHUR HENRY MOUNTAIN, of The Town Hall, Withington, Manchester, 'in
the County of Lancaster, Civil Engineer, do hereby declare the inattire of this
invention to be as follows:-
A.
U in it.
JL
My, invention relates to an improved levelling staff used in surveying and has
for its object to protect the graduated face of the staff when not in use and, also
to make the staff more portable and convenient for carrying.
!
At the present time most levelling staffs are, made telescopic, but in these staffs
some portion of the graduated surface is always exposed and liable to be soiled
and injured when not in use..
According to my invention in place of making the staff telescopic, I make it
say in three parts, the middle and bottom pieces being hinged or jointed together,
and the top piece being fitted to slide in a dovetailed groove formed, to receive
it in the middle piece..
3. ↳
When the hinge is opened and the staff extended a pin is put, through eyes on
the hinged pieces and secured by its end screwing into one of the eyes.
The graduated surface of each piece is slightly recessed, so that when, the top
piece is out of use and pushed into the recess at the back of the middle, piece it
is protected from all damage, and likewise the graduated surfaces, of the. two
hinged pieces are recessed and come opposite one another. when the.. staff is
doubled up:
I further hollow out a longitudinal groove along the back, of the
bottom piece of the staff so that when the staff and tripod. of, a level, or theodo-
lite are packed for transport the tripod lies partly within the recess and thus the
tripod can be more conveniently secured to the staff and the combined parts
occupy less 'space:
H. B. BARLOW & GILLETT,
Agents for Applicant.
COMPLETE SPECIFICATION.
An Improved Levelling Staff used in Surveying.
I, ARTHUR HENRY MOUNTAIN, of The Town Hall, Withington, Manchester, in
the County of Lancaster, Civil 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;
-
My invention relates to an improved levelling staff used in surveying and has
for its object to protect the graduated face of the staff when not in use and also
to make the staff more portable and convenient for carrying.

page_text: At the present time most levelling staffs are made telescopic, but in these staffs
some portion of the graduated surface is always exposed and liable to be soiled
and injured when not in use.
According to my invention in place of making the staff telescopic, I make it
say in three parts, the middle and bottom piéces being hinged or jointed together,
and the top piece being fitted to slide in a dovetailed groove formed to receive
it in the middle piece.
When the hinge is opened and the staff extended a pin is put through eyes on
the hinged pieces and secured by its end screwing into one of the eyes.
The graduated surface of each piece is slightly recessed so that when the top
piece is out of use and pushed into the groove at the back of the middle piece it
is protected from all damage and likewise the graduated surfaces of the two
hinged pieces are recessed and come opposite one another when the staff is
doubled up.
In the accompanying sheet of drawings—
Fig. 1
a view of the back, Fig. 2 a view of the front and Fig. 3 a side view
of a levelling staff. opened for use and made according to my invention, Fig. 4
is a view of the staff folded together for transport, Fig. 5 is a transverse section
on the line A A, Fig. 3, and Fig. 6 is a similar section on the line BB, Fig. 4.
In these views, a designates the bottom piece and 6 the middle piece of the staff
these parts being hinged or jointed together at c; on each half of the hinge is
an eye d through which when the hinge is opened a pin e is passed to hold the
pieces a and b rigid; when it is desired to fold the staff as in Fig. 4, the pin e.
must be removed.
The piece has a dovetailed groove f cut in its back surface and in this groove
is fitted a third piece g of the staff, see Figs. and 6, the piece being drawn out.
for use as required and held in position by the dovetailed groove and clips h
secured to the piece b; when not in use the piece g is entirely protected by the
piece b.
The pieces a and b are recessed slightly to receive the graduations, and these
surfaces come together and are protected when the staff is doubled up out of use.
I further hollow out a longitudinal groove along the back of the bottom piece
of the staff so that when the staff and tripod of a level or theodolite are packed
for transport the tripod lies partly within the recess and thus the tripod can be
more conveniently secured to the staff and the combined parts occupy less space.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The improved levelling staff made in three parts the middle and bottom
pieces being hinged together and the top piece being fitted to slide in a dovetailed
groove formed to receive it in the middle piece and means such as a pin and eyes
being provided for locking the staff when extended all substantially as and for
the purposes described.
2. In a levelling staff constructed in three parts as indicated in Claim 1,
arranging the pieces so that when made up all the graduated surfaces are covered
and protected and the tripod can be conveniently packed in a groove formed
to receive it at the back of either of the lower parts substantially as and for the
purposes herein described.
H. B. BARLOW & GILLETT,
Agents for Applicant, 17, St. Ann's Square, Manchester.