A Method or System of Projection of the Globe.
Year: 1888

page_text: Date of Application, 21st Sept., 1888
Complete Specification Left, 27th May, 1889-Accepted, 13th July, 1889
PROVISIONAL SPECIFICATION.
A Method or System of Projection of the Globe.
I, HENRY BOUTHILIER DE BEAUMONT, of Geneva, in Switzerland, do hereby
declare the nature of said Invention to be as follows:-
All the planispheres established till now, according to different geometrical
methods, have the serious inconvenience of considerably deforming the continents and
islands.
My method or system has the advantage of not producing so considerable a
deformation, and, furthermore, it is much easier to be used, all the meridians and
circles of latitude being reproduced by means of a pair of compasses.
My method or system consists substantially in the mathematical development of
the globe, by means of circles which are inscribed upon equidistant longitudes and
latitudes and dividing the longitudes into hours (that is to say into divisions of
15 degrees,) giving a division of twelve hours eastward and of twelve hours westward
of the cosmopolite noon.
In the accompanying drawings, Fig. 1 shows a projection of the globe, according
to my system, with the meridian of Behring as cosmopolite noon.
Fig. 2 shews a modification of the same projection. Fig. 3 is a projection of the
northern, and Fig. 4 a projection of the southern, hemisphere, devised according to
the same system or method.
1
Upon the ordinates X X, Y Y (fig. 1) I inscribe CO-0D and OB=OA=CD.
I then divide OA and O'B each into twelve equal parts. I thus obtain three points
of each meridian, for instance CA and D and CB and D) for the extreme meridians;
now, with the help of the well known geometrical rule I determine the centre of
each of these circles, and I obtain the meridians by tracing the corresponding circles
with a pair of compasses. I then divide the thus obtained meridians CAD and CBD
each into twelve equal parts, thus obtaining three points of each circle of latitude,
for instance E F G. I then proceed in the same way, as for the meridians, to find
out the centre of the circles corresponding to each series of three points E F G etc.,
and I obtain the circles of latitude in tracing these circles by means of the compasses.
Fig. 2 shews the same construction of the meridians combined with a different
construction, of the latitudes, the latter being the construction generally used. For
the projection of the northern and southern hemispheres (Figs. 3 and 4) I proceed as
follows:
Upon the circle BCD, which represents the equator, I inscribe on the right and
on the left of the first half meridian AD twelve degrees of longitude corresponding
to the six degrees of latitude inscribed upon the half-meridian A D. Tracing then
the perpendicular upon the centre of the line AC, and the tangent to the middle of
the circle CD, I obtain in the intersection of these two lines the centre H of the
circle A C. The other meridians are constructed in the same way.
Dated this 21st day of September 1888
COMPLETE SPECIFICATION.
A Method or System of Projection of the Globe.
I, HENRY BOUTHILIER DE BEAUMONT, of No. 2 rue Calabri Geneva, in Switzerland,
Gentleman, 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
I Price fidl

page_text: by the following statement, reference being had to the drawings and to the letters and
figures marked thereon, that is to say:
All the planispheres established till now, according to different geometrical methods,
have the serious inconvenience of considerably deforming the continents and islands.
My method or system has the advantage of not producing so considerable a
deformation, and furthermore, it is much easier to be used, all the meridians and
circles of latitude being reproduced by means of a pair of compasses.
My method or system consists substantially in the mathematical development of
the globe by means of circles which are inscribed upon equidistant longitudes and
latitudes and dividing the longitudes into hours (that is to say into divisions of
15 degrees), giving a division of twelve hours eastward and of twelve hours westward
of the cosmopolite noon.
In the drawings filed with my Provisional Specification, Fig. 1 shows a projection
of the globe, according to my system, with the meridian of Behring as cosmopolite
noon.
Fig. 2. shows a modification of the same projection.
Fig. 3. is a projection of the northern, and Fig. 4 a projection of the southern
hemisphere devised according to the same system or method.
Upon the ordinates X X, YY, (Fig. 1.) I inscribe CO-O D and O B=0 A=CD.
I then divide OA and OB each into twelve equal parts. I thus obtain three
points of each meridian, for instance C, A, and D, and C, B, and D, for the extreme
meridians; now, with the help of the well known geometrical rule 1 determine the
centre of each of these circles and I obtain the meridians by tracing the corre-
sponding circles with a pair of compasses.
I then divide the thus obtained
meridians CAD and CBD each into twelve equal parts, thus obtaining three points
of each circle of latitude, for instance E, F, G. I then proceed in the saine way, as
for the meridians, to find out the centre of the circles corresponding to each series of
three points E F G etc. and I obtain the circles of latitude in tracing those circles
by means of the compasses. Fig. 2 shows the same construction of the meridians
combined with a different construction of the latitudes, the latter being the construction
generally used. For the projection of the northern and southern hemispheres.
(Figs. 3 and 4) I proceed as follows :
Upon the circle B C D, which represents the equator, I inscribe on the right and
on the left of the first half-meridian A D twelve degrees of longitude corresponding
to the six degrees of latitude inscribed upon the half-meridian A D. Tracing then
the perpendicular upon the centre of the line A C and the tangent to the middle of
the circle CD, I obtain in the intersection of these two lines the centre il of the
circle A C. The other meridians are constructed in the same way.
Having now particularly described and ascertained my invention and in what
manner the same is to be performed, I claim.
=
=
The method or system of projection of the globe, the same consisting in inscribing
upon the ordinates XX, YY, (Fig. 1) CO OD and OB=OA: CD, dividing
OA and B each into twelve equal parts and tracing the circles CA D, CBD, etc.:
forming the meridians, each of which is determined by three points, then dividing the
extreme meridians CA D. and CBD each into twelve equal parts and tracing the
circles of latitude E F G etc.: determined by three points, substantially as shewn and
described.
· Dated this 27th day of May 1980