Abstract:
I. Product and ifs uses
Among the important survey instruments,
optical type survey instruments, namely Dumpy
Level, Sextants, Theodolites are used by Civil
Engineers, Surveyors, Mining Engineers, Rail
and Road construction Engineers. The Dumpy
Level is also called as screw precision level consisting
of a Telescope internal focussing type,
a spirit level, fully divided to facilitate setting
and adjustment, levelling arrangements. The
base plate is so designed to use with or without
stand. Usually the instrument is supplied complete
with carrying case and tripod rigid leg.
Wide application is made for measurement'> in
underground and road construction for longitudinal
and cross sections and for normal levelling
purposes. Usually the instrument is
approximately levelled in all meridians by
means or the parallel screws or by ball joint in
conjunction with a circular bubble. The final
levelling for each sight immediately prior to
reading the staff is done by means of a micrometer
screw provided and gradiant can be set
or measured. One of the important features of
the instrument is the range operating , and
reading accuracy to which the instrument is
built. Sextants are used for direction and
measuring radiants.