Telescope and Theodolite

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

....cal instrument for making distant objects appear nearer and larger, consisting of one or more tubes with an arrangement of lenses, or of one or more mirrors and lenses, by which the rays of light are collected and brought to a focus and the resulting image magnified. Telescopes are of two kinds: refracting, in which the image is reproduced by a lens (the object-glass) and reflecting, in which it i....

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

.... sights; subsequently variously elaborated with a telescope instead of sights, a compass, level, vernier, micrometer, and other accessories, and now often with the addition of a vertical circle or arc for the measurement of angles of altitude or depression. Hence theodolitic a. of, pertaining to, done, or made with a. t." The New Encyclopaedia Britannica, Volume 18, 15th Edition, at page 97,....

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

....cal telescopes. In one such telescope, the longbaseline radio interferometer, the two elements may be separated by hundreds or even thousands of miles."   The New Encyclopaedia Britannica, Volume 17, 15th Edition, gives the meaning of "theodolite", at page 830, under the heading "Angle-measuring equipment", and it reads, as under: "Angle-measuring equipment. The theodolite is the basi....

X X   X X   Extracts   X X   X X

Full Text of the Document

X X   X X   Extracts   X X   X X

.... are classified according to function." It also gives the meaning 'theodolite' at page 1025, as below: "The-odo-lite (Oi-od-lait) n. an instrument used by surveyors to measure vertical and horizontal angles, consisting of a small telescope moving along a graduated scale. (origin unknown). Bureau of Indian Standards issued specifications as respects vernier theodolite. The foreword to the speci....