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KF5JRV > TECH 05.12.16 14:18l 10 Lines 1055 Bytes #999 (0) @ WW
BID : 6510_KF5JRV
Read: GUEST
Subj: Theodolite
Path: IZ3LSV<IW0QNL<JH4XSY<JM1YTR<JE7YGF<N9PMO<NS2B<KF5JRV
Sent: 161205/1215Z 6510@KF5JRV.#NWAR.AR.USA.NA BPQK6.0.13
Theodolite
A basic surveying instrument of unknown origin but going back to the 16th-century English mathematician Leonard Digges; it is used to measure horizontal and vertical angles. In its modern form it consists of a telescope mounted to swivel both horizontally and vertically. Leveling is accomplished with the aid of a spirit level; crosshairs in the telescope permit accurate alignment with the object sighted. After the telescope is adjusted precisely, the two accompanying scales, vertical and horizontal, are read.
Mounted on a tripod with adjustable legs, the theodolite is used in the field to obtain precise angular measurements for triangulation in road building, tunnel alignment, and other civil-engineering work. The transit is a variety of theodolite that has the telescope so mounted that it can be completely reversed, or transited. The phototheodolite, a combination camera and theodolite mounted on the same tripod, is used in terrestrial photogrammetry for mapmaking and other purposes.
73 Scott KF5JRV
KF5JRV.#NWAR.AR.USA.NA
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