An optical instrument which consists of a sighting telescope, mounted so that it is free to rotate around horizontal and vertical axes, and graduated scales so that the angle of rotation may be measured The telescope is usually fitted with a right-angle prism so that the observer continues to look horizontally into the eyepiece, whatever the variation of the elevation angle
A surveying instrument consisting of a tripod, compass, level, scale and telescope
a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod
An optical instrument which consists of a sighting telescope mounted so that it is free to rotate around horizontal and vertical axes, with graduated scales so that the angles of rotation may be measured Used to observe the motion of a pilot balloon
A precise angle measuring instrument It consists of a sighting telescope which can be moved in azimuth and elevation The azimuth and elevation angels are very precisely encoded Using two widely separated instruments operators can sight through the telescopes on a common point and produce the 3-dimensional coordinates of the point by triangulation
A precise surveying instrument having a telescopic sight for measuring horizontal and vertical angles