Title: A Treatise on the Principles and Practice of Levelling, Showing Its Application to Purposes of ...
Description: Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
Subjects: dbygoogle, treatise, instrument, surface, distance, height, datum, feet, level, horizontal, half width, computed half, forward station, bench mark, sir john, dbygoogle dbygoogle, starting point, public domain, object glass, equally distant