Four crosses for 15°, 30°, 60° and 90° with brass pressure fittings. Cross for 15° with brass wings so that it can be used as a horizon vane for back observation. Sides of staff incised for "ALTITUDE" and "COMPLEMENT" (zenith distance):
5-15 degrees every one degree and 85-75 degrees every 15'
10-30 degrees every one degree and 80-60 degrees every 15'
20-60 degrees every one degree and 70-30 degrees every 15'
34-90 degrees every one degree and 56-0 degrees every 15'
In fitted wooden box.
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