||Orthography is in accordance with the orders of the Government of India, dated 3rd September1875.
Conventional Signs Trigonometrical Stations ▲ Intersected Points and Traverse Stations ○ State Boundaries ~~ Edge of Forest Clearances ☁ Heights above mean sea level determined trigonometrically thus 752, Relative heights in feet of banks to beds of water-courses thus 26r 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 referrible to mean sea level at Okkha Tidal Station on the Gulf of Cutch.
The longitudes are referrible to the old value of the Madras Observatory, 80° 17' 21 to which a correction of 3' 1 is required to reduce to the most recent value, viz : 80° 14' 20, vide nautical Almanac for current year. Index to Adjoining Sections