A french cross staff has 8 faces.
Cross staff: Cross staff is an instrument, which is used to measure the angle of elevation and it consists of a calibrated staff along with a perpendicular staff sliding onto it.
Cross staff can be classified into three types;
- Open cross-staff
- French cross-staff
- Adjustable cross-staff
French cross staff: French cross staff is an instrument which is used to set out an angle of 45o or 90o. It consists of eight octagonal tubes with slits on each eight face.
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