AC6........my Dad was a professional surveyor and occasionally, he'd "hire" me to be his "rod-man".
While most transits use an 8-power scope, occasionally they have a 12-power scope. Everytime he took a reading, the damm plumb-bob would start swinging in the wind. He'd haffta "swing" the transit 180-deg to make certain the transit was LEVEL. Hardest part of me being a rod-man was keeping the rod "STEADY". Most distances were 1/4-mile (660-ft) or less. Man, I HATED draggin' that metal chain 'cuz it was 8-links. (12-ft to link) And iff'n yer eyeballs are good enuff to read 8-inches in 1-mile, better hang a plumb-bob from yer pecker and hire out as a surveyor.......the hung Dell
BTW.......they do include curvature of the earth in land or property surveys; you just gotta read the neats and bounds. They are referenced to USGS "corners" (round BRASS spots) set in the ground
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