edm
DESCRIPTION
SurveyingTRANSCRIPT
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Study and Use of conventional Surveying Instruments and EDM Devices
ByEngr.Sidra Shahid
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Transit Theodolite
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The Transit Theodolite
• Trivet• Foot Screw• Tribrach• Levelling head
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The Transit Theodolite
• Lower Plate• Upper plate• Plate Bubble
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The Transit Theodolite
• Telescope • Vertical Circle• Index bar or T frame• Altitude Bubble • Compass
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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
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Face leftThe vertical circle of the
theodolite is on the left of the observer at the time of taking
readings
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Face RightThe vertical circle of the
theodolite is on the right of the observer when the
readings is taken
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Telescope NormalThe face left position is known as ‘telescope normal’ or ‘telescope
direct’.It is also referred as ‘Bubble up’.
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Telescope InvertedThe face right position is known as ‘telescope inverted’ or ‘telescope
reversed’.It is also referred as ‘Bubble down’.
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Changing faceThe operation of bring the
vertical circle from one side of the observer to the other.
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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.
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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
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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
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Axis of the bubble tube
•This axis is an imaginary line tangential to the longitudinal curve of the bubble tube at
its middle point.
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Vertical axisThis axis of rotation of the telescope in the horizontal plane
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Horizontal axisThis axis of rotation of the telescope in vertical plan. It is also known as the turnnion axis.
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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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Any Question ???
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Thank you