edm
DESCRIPTION
SurveyingTRANSCRIPT
Study and Use of conventional Surveying Instruments and EDM Devices
ByEngr.Sidra Shahid
Transit Theodolite
The Transit Theodolite
• Trivet• Foot Screw• Tribrach• Levelling head
The Transit Theodolite
• Lower Plate• Upper plate• Plate Bubble
The Transit Theodolite
• Telescope • Vertical Circle• Index bar or T frame• Altitude Bubble • Compass
Centering•The setting of theodolite exactly over
a station mark by means of plumb bob
• The plumb bob is suspended from hook fixed below the vertical axis
Face leftThe vertical circle of the
theodolite is on the left of the observer at the time of taking
readings
Face RightThe vertical circle of the
theodolite is on the right of the observer when the
readings is taken
Telescope NormalThe face left position is known as ‘telescope normal’ or ‘telescope
direct’.It is also referred as ‘Bubble up’.
Telescope InvertedThe face right position is known as ‘telescope inverted’ or ‘telescope
reversed’.It is also referred as ‘Bubble down’.
Changing faceThe operation of bring the
vertical circle from one side of the observer to the other.
Swinging the telescope
This indicates turning of the telescope in a horizontal plane .it is called “right swing” when the telescope is turned clockwise and “left swing” when the telescope is turned anticlockwise.
Line of Collimation • It is an imaginary line passing
through the intersection of the cross hairs at the diaphragm and the
optical centre of the object glass and its continuation
Axis of the telescope
• This axis is an imaginary line passing through optical centre
of the object glass and the optical centre of the eye piece
Axis of the bubble tube
•This axis is an imaginary line tangential to the longitudinal curve of the bubble tube at
its middle point.
Vertical axisThis axis of rotation of the telescope in the horizontal plane
Horizontal axisThis axis of rotation of the telescope in vertical plan. It is also known as the turnnion axis.
Temporary adjustment
The setting of the theodolite over a station at a time of taking any observation.• It is necessary for every set up of
the instrument.
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