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Instruments used for setting out right angles - French cross staff
Unit 1- Surveying
Instruments used for setting out right angles
French cross staff
It consists of a hollow octagonal box. Vertical sight slits are cut in the middle of each face, such that the lines between the centres of opposite slit makes an angle of 450 with each other. It is possible to set-out angles of either 450 or 900 with this instrument.
Last modified: Thursday, 28 April 2011, 8:45 AM