Notes/Description |
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Orthography is in accordance with Bombay Government Official List (Bombay Places and common official words).
Conventional Signs. Trigonometrical Stations ▲ Intersected points and traverse Stations ○ State boundaries ~~ Edge of forest clearances ☁ Heights above mean sea level determined trigonometrically thus 752. Indicated heights of contours thus, ○1200. The Vertical interval between the contours on this map (surveyed by the water level) is 25 feet. The linear values are derived from the measured length of the Sironj base, assumed as log. feet 4.5844824, through the Karachi Longitudinal Series.
The heights are refferible to Mean Sea Level at Okha Tidal Station on the Gulf of Cutch.
The Longitudes are refferible to that of Madras Observatory, taken as 80° 17' 21, to which a correction of - 2' 30 must be reduce to the most recent value, viz : 80° 14' 51 |