||Orthography, is in accordance with the orders of the Government of India dated 20th September 1873.
Numerals, Thus 43 or 160 0.1.2. & c. are the revenue survey numbers of the fiscal divisions. Thus ▲ are the heights in feet of trigonometrical stations above the mean sea level. Thus on made roads ∥ 141.6 are levels in feet furnished by the executive engineer Ahmedabad and reduced to Mean Sea Level. Thus ⊙ B.M. 97.5 are levels in feet furnished by the Executive Engineer for irrigation Ahmedabad and reduced to mean sea level. Thus ══ 26 & 13 are mile stones and indicate the number of miles from the termini mentioned on the margin where the road leaves the map. Thus 15r indicate the relative height in feet of banks to beds of water courses.
The longitudes are referrible to Madras Observatory, old value, Viz. 80° 17' 21, to which a correction of - 3' 11 must be applied to reduce to the most recent value, viz., 80° 14' 20. Vide Nautical Almanac for the current year. Heights of Dangarwari H.S., 97.97 feet deduced from Diu Tidal Observations. Erratum : All the heights on this sheet shown thus ☉ B.M. 97.5, were furnished by the Irrigation department, and require a correction of -5 feet to reduce them to heights above mean sea level Index to adjoining sections