Surveyor 1 & C.

adjustment advanced base airstrip alidade altitude approach zones azimuth boat caisson celestial equator celestial pole celestial sphere centerline central angle chord definition circle clear zone clearance computed construction control points control stations culvert deflection angle degree of curve distance drain drainage dredge duct earth elevation established excavation feet field gage grade stakes grade tangents gradient horizontal alignment HOUR ANGLE intersection intervals landing strip law of sines length logarithms main baseline manhole mass diagram measured Naval NavPers necessary nomograph observed pantograph parallax party percent piles pipe placed plane table plane-table planimeter plotted pole position radius right ascension runway scale Seabee sewer sextant shaft sheet shore shown in figure shows sides sines slide rule slope soundings stadia subgrade surface surveying Surveyor telescope tide tion transit traverse triangle tunnel underground usually vertical curve vertical offset water-front structures Yards and Docks