London : Longman, Rees, Orme, Brown, Green, and Longman · leaf 678
nt iscovered with a plate ofbrass, divided in a mannersimilar to the scale for as-certaining the difference between a base and hypotenuse line which is on most theodolites.The mode of using it is, to place the bottom, or flat part, on anoffset staff, laid parallel with the surface of the ground,… … 6Gi Notice of Two Rocking-Chairs. that inclination. This allowance is to reduce the length of linesmeasured over sloping or undulating ground, to the length of thebase, or level line, and is necessary in every survey, as the baseof the land, and not the surface, is to be computed.Worcester, Oct.…
Architecture
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