The back contains 7 scales of the following types:
Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
---|---|---|---|---|
Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
Altitude | 0 - 90, Degrees of arc | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
Sine/Cosine | 1/60 of quadrant radius | Not numbered | Angle | Upper left quadrant (inside circular scales) |
Equal hours | 1 - 7, Times of day | Every 1 hours | Arc | Upper right quadrant (inside circular scales) |
Unequal hours | 1 - 6, 1/12 of daylight | Every 1 hours | Arc | Lower right quadrant |
Shadow square | 1 - 12, Fingers | Every 5 and at 12 fingers | Box | Lower left quadrant |
Cotangent | 0 - 60, Fingers | Every 5 from 15 fingers | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
Degree | 0 - 45, Degrees of arc | Every 5 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
Degree | 0 - 45, Degrees of arc | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
Transcription | Translation | Notes | Type |
---|---|---|---|
سنه ١١٢٥ | Year 1125 | Date |