| NOMENCLATURE |
TRANSIT. AN INSTRUMENT HAVING TWO COAXIAL CENTERS, ONE INSIDE THE
OTHER. A TELESCOPE IS ATTACHED TO THE INNER CENTER AND MOUNTED IN SUCH
A MANNER THAT IT MAY BE ROTATED IN VERTICAL OR HORIZONTAL ARCS. THE
OUTER CENTER CARRIES THE HORIZONTAL SCALE. THE TELESCOPE AND HORIZONTAL
CIRCULAR SCALE MAY ROTATE ABOUT THE SAME AXIS, INDEPENDENT OF EACH
OTHER, OR INTEGRALLY, AS A SINGLE UNIT. THE SCALES ARE READ VISUALLY BY
MEANS OF VERNIERS. THE INSTRUMENT IS USUALLY LEVELED
BY MEANS OF FOUR LEVELING SCREWS. IT IS USED FOR MEASURING HORIZONTAL,
OR HORIZONTAL AND VERTICAL ANGLES.
|
