Dip-sector, an astronomical instrument for determining the dip of the horizon, is in principle similar to the Sextant (q.v.). See HORIZON.
Dip-sector
Chambers's Encyclopaedia, Volume 4: Dionysius to Friction, p. 7
Source scan(s): p. 0016
Dip-sector, an astronomical instrument for determining the dip of the horizon, is in principle similar to the Sextant (q.v.). See HORIZON.