English

The quantity applied to the nominal length of a TAPE to allow for a change in its effective length because of its being used at a tempera­ture other than that for which its standard length is given.

The CORRECTION applied to the nominal length of a TAPE to allow for a change in effective length because of its being used at a tensi­on other than that for which its standard length is known.

CORREC­TIONS applied to a distance measured with a TAPE to eliminate ERRORS caused by the physical condition of the TAPE, and to the manner in which it is used.

Any object, point, etc., toward which some­thing is directed. An object which reflects a sufficient amount of a radiated SIGNAL to produce an echo signal on detection equipment. See RADAR TARGET, SONAR TARGET. The distinctive marking or instrumentation of a ground point to aid in its iden­tification on a PHOTOGRAPH. In PHOTOGRAMMETRY, target designates a material marking so arranged and placed on the GROUND as to form a distinc­tive pattern over a geodetic or other control point marker, on a property corner or line, or at the positi­on of an identifying point above an underground facili­ty or feature. A target is also the image pat­tern on AERIAL PHOTOGRAPHS of the actual MARK placed on the GROUND prior to PHOTOGRAPHY.

LATTICES resulting from the enlarge­ment of small parts of Two Range and hyperbolic LAT­TICES, used for work which has to be carried out on a SCALE larger than that being used for the main SURVEY.

An apparatus designed for measuring horizontal distan­ces at sea. It is con­struc­ted so that a wire of small diameter, one end of which is anchored on the BOTTOM, passes around a calibrated sheave as the ship steams along the route to be measu­red.

A mooring arrangement in which a submerged FLOAT provides the upward force necessary to maintain the system in a fixed position with reference to the sea bottom.

Any transmission, emission, or reception of signs, SIGNALS, writing, IMAGES and SOUNDS or intelligence of any nature by wire, RADIO, visual or other electromagnetic systems.

An instrument for determining the distance from one point to another. Some such instruments employ a TELESCOPE and measure the angle subtended by a short base of known length. The complete equipment for measuring any quantity, transmitting the results electrically to a distance point, and there recording the values measured.

An electronic device that measu­res the phase difference or transit time between a transmitted electromagnetic IMPULSE of known FREQUENCY and SPEED and its return.

The study and technique involved in measu­ring a quantity or quantities in place, trans­mitting this value to a station, and there interpret­ing, indi­cating, or recording the quantities; and transmitting commands from the station to control the measurement device.