DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.20132#0299
PANOKAMAS AND PROFILES IN REFERENCE TO HYPSOMETRY.
265
DIAGRAMS ADDED TO THE PANORAMIC PROFILES.
A plan of geographical positions is added to each plate, combining two panoramas
on the scale of 32 miles to the inch.
Care has been taken to make the central meridional line vertical, but the variation
arising from the geographical network of latitude and longitude occasions some dif-
ferences between the angles of bearings in nature and those on the plan, though in-
deed they are not important, and chiefly occur in the lateral parts. In the centre
another little difficulty has arisen, modifying the absolute coincidence of the bearings
in the plan with those on the panorama. It was found impossible to avoid an oc-
casional slight change of the eye-station when drawing, in order to obtain the most
favourable conditions for a foreground, the position of a theodolite which only needs
perfect freedom in every direction, not always coinciding with the eye-station necessary
for a drawing. However, with a little management, the differences have been reduced,
so as to be hardly appreciable. To peaks not visible from the eye-station no line of
bearing is drawn.
Two hypsometrical diagrams are inserted on either side of the plan. The peaks
follow each other in the order of their longitude, differences of latitude altogether
disappearing on this projection. In these diagrams, peaks not visible from the eye-
station are distinguished by dotted lines. The vertical scale is 1 to 60,000, or 5,000 ft.
to the inch, the levels not commencing before 10,000 ft., in consequence of the em-
ployment of so large a scale.
Where the succession of the peaks was chiefly longitudinal (from east to west),
we retained the scale of 32 miles to the inch, but in cases where the general suc-
cession was more diagonal, we employed a larger scale for the differences of longitude,
in order to avoid an unnecessary crowding of heights within a small space.
DESIGNATION OF PEAKS.
We must also draw attention to a circumstance already alluded to, pp. 66 and 67
of this volume, where we explained the method of nomenclature adopted in distin-
guishing the different peaks. The necessity of finding proper names for the various
objects is not only of importance for trigonometrical operations in general, but also
for every geographical detail. In most cases little difficulty was experienced, and
n. 34
*
265
DIAGRAMS ADDED TO THE PANORAMIC PROFILES.
A plan of geographical positions is added to each plate, combining two panoramas
on the scale of 32 miles to the inch.
Care has been taken to make the central meridional line vertical, but the variation
arising from the geographical network of latitude and longitude occasions some dif-
ferences between the angles of bearings in nature and those on the plan, though in-
deed they are not important, and chiefly occur in the lateral parts. In the centre
another little difficulty has arisen, modifying the absolute coincidence of the bearings
in the plan with those on the panorama. It was found impossible to avoid an oc-
casional slight change of the eye-station when drawing, in order to obtain the most
favourable conditions for a foreground, the position of a theodolite which only needs
perfect freedom in every direction, not always coinciding with the eye-station necessary
for a drawing. However, with a little management, the differences have been reduced,
so as to be hardly appreciable. To peaks not visible from the eye-station no line of
bearing is drawn.
Two hypsometrical diagrams are inserted on either side of the plan. The peaks
follow each other in the order of their longitude, differences of latitude altogether
disappearing on this projection. In these diagrams, peaks not visible from the eye-
station are distinguished by dotted lines. The vertical scale is 1 to 60,000, or 5,000 ft.
to the inch, the levels not commencing before 10,000 ft., in consequence of the em-
ployment of so large a scale.
Where the succession of the peaks was chiefly longitudinal (from east to west),
we retained the scale of 32 miles to the inch, but in cases where the general suc-
cession was more diagonal, we employed a larger scale for the differences of longitude,
in order to avoid an unnecessary crowding of heights within a small space.
DESIGNATION OF PEAKS.
We must also draw attention to a circumstance already alluded to, pp. 66 and 67
of this volume, where we explained the method of nomenclature adopted in distin-
guishing the different peaks. The necessity of finding proper names for the various
objects is not only of importance for trigonometrical operations in general, but also
for every geographical detail. In most cases little difficulty was experienced, and
n. 34
*