An Implement for use in Levelling or Ascertaining Gradients.
Year: 1892

page_text: Date of Application, 23rd Dec., 1892
Complete Specification Left, 1st Sept., 1893—Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
An Implement for use in Levelling or Ascertaining Gradients.
I, LOUIS JEAN JACQUES AUBERT, of Moulin, Correze in the Republic of
France, of no occupation, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to provide a cheap and efficient implement for the
use of persons engaged in levelling ground, arranging slopes, or setting out
any works or measuring slopes or performing any similar operation, the said
implement being intended to be placed with its two legs on the ground or
respectively on the two points between which the level or difference of level is to
be ascertained.
The implement consists of a frame of wooden bars the general shape of this
frame being that of an isosceles triangle or trapezium, the angles at the base being
about 60 and the side bars projecting downwards to a desired distance below the
lower cross bar to serve as legs. Cross braces may be placed to fix the lower angles
and the whole may be put together with iron or other bolts and nuts so that it may
be dismounted for transport.
From the centre of the shorter upper cross bar if there is one, or from the
apex of the triangle hangs a line with plummet on the lower end and the lower
cross bar is provided with a graduated scale in each direction from a zero line
in the centre.
When the points on which the legs rest are level the one with the other, the
plumb line will be perpendicular to the lower cross bar and will cross the face of
the latter exactly at the zero mark. If however the one leg be placed on a higher
point than the other the plumb line will cross the scale nearer to the lower end in
proper proportion to the difference in level.
Dated this 23rd day of December 1892.
R. HADDAN,
Agent to Applicant.
COMPLETE SPECIFICATION.
An Implement for use in Levelling or Ascertaining Gradients.
I LOUIS JEAN JACQUES AUBERT of Moulin, Correze in the Republic of
France, of no occupation 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 :-
.
The object of this invention is to provide a cheap and efficient implement for the
use of persons engaged in levelling ground, arranging slopes or setting out
any works or measuring slopes or performing any similar operation, the said
implement being intended to be placed with its two legs on the ground or
respectively on the two points between which the level or difference of level is to
be ascertained.
The implement consists of a frame of wooden bars the general shape of this
frame being that of an isosceles triangle or trapezium, the angles at the base being
about 60° and the side bars projecting downwards to a desired distance below the
lower cross bar to serve as legs. Cross braces may be placed to fix the lower angles
and the whole may be put together with iron or other bolts and nuts so that it may
be dismounted for transport.
From the centre of the shorter upper cross bar, if there is one, or from the

page_text: apex of the triangle hangs a line with plummet on the lower end and the lower
cross bar is provided with a graduated scale in each direction from a zero line
in the centre.
When the points on which the legs rest are level, the one with the other, the
plumb line will be perpendicular to the lower cross bar and will cross the face of
the latter exactly at the zero mark. If however the one leg be placed on a higher
point than the other, the plumb line will cross the scale near to the lower end in
proper proportion to the difference in level..
This invention is shown in the annexed drawing in which A A are the two side
bars or legs, B the base or graduated cross bar, B the upper cross bar, C the plumb
line with weight at the lower end, 0° the zero point and c rivets or bolts and nuts.
A are braces at the lower angles.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
The implement consisting of a graduated base bar B', two side bars A A
prolonged below the base bar, and plumb line C suspended at the apex or from the
upper cross bar B and braces A' when said cross bar B is used, the whole
substantially as and for the purpose set forth.
Dated this 1st day of Sentember 1803
R. HADDAN,
Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, Agent for Applicant.