Search the Dictionary

An instrument used, especially in trigonometrical surveying, for the accurate measurement of horizontal angles, and also usually of vertical angles. It is variously constructed.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

A theodolite. Knight.

g of the leveling staff, except the backsight; any sight or bearing taken by a compass or theodolite in a forward direction.

A phototheodolite, or a camera designed for use in photogrammetry. --Pho`to*gram*met"ric (#), Pho`to*gram*met"ric*al (#), a.

- Repeating instruments (Astron. & Surv.), instruments for observing angles, as a circle, theodolite, etc., so constructed that the angle may be measured several times in succession, and different, but successive and contiguous, portions of the graduated limb, before reading off the aggregate result, which aggregate, d…

In a theodolite, etc., horizontal cross wires or hairs equidistant from the central horizontal cross wire.

Of or pertaining to a theodolite; made by means of a theodolite; as, theodolitic observations.

An instrument resembling a theodolite, used by surveyors and engineers; -- called also transit compass, and surveyor's transit.

A three-legged frame or stand, usually jointed at top, for supporting a theodolite, compass, telescope, camera, or other instrument. Tripod of life, or Vital tripod (Physiol.), the three organs, the heart, lungs, and brain; -- so called because their united action is necessary to the maintenance of life.…

species of Eucalyptus. -- Vertical limb, a graduated arc attached to an instrument, as a theodolite, for measuring vertical angles. -- Vertical line. (a) (Dialing) A line perpendicular to the horizon.

he forked holders for supporting the telescope of a leveling instrument, or the axis of a theodolite; a wye.