Stadia Match Output

Number:95

Maker:Chinese Unknown
PHOTO

Length: 25 cm

Gauge Marks: p" π 6.366

Scales Front: km 1-cos/ 1-cos A = B sec² ST T = C L

Scales Back: = ST S C =

Info: FanHsiu Chang Collection
Military Commission Surveying and Mapping Bureau
A gauge mark of 6.366 specified as R but not a conventional R. 63.66 is 200/π which is grads in a radian on the 400^g system.
On the lower side of the rule is a scale "l" which ranges from 5 to 50. This would be the range of the T scale on a 400^g rule.