Survey.
an instrument, consisting of a spirit level mounted under and parallel to a telescope, that can be rotated in its Y-shaped supports for adjustment.
Survey.
an instrument, consisting of a spirit level mounted under and parallel to a telescope, that can be rotated in its Y-shaped supports for adjustment.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012