||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 trigonometerically thus 752 Relative heights in feet of banks to bed 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 Okha Tidal Station on the Gulf of Cutch.
The Longitudes are refirrible to Madras Observatory , 80° 17' 21 to which a correction of 3' 1 must be applied to reduce to the most recent value, viz : 80° 14' 20 Index To Adjoining Sections. Sheet 35