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Study and Use of conventional Surveying Instruments and EDM Devices By Engr.Sidra Shahid

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Surveying

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Page 1: EDM

Study and Use of conventional Surveying Instruments and EDM Devices

ByEngr.Sidra Shahid

Page 2: EDM

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