The back contains 10 scales of the following types:
Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
---|---|---|---|---|
Altitude | 0 - 90, Degrees | Every 5 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
Altitude | 0 - 90, Degrees | Every 5 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
Declination | Gemini/Cancer - Sagittarius/Capricorn, Zodiacal sign | Not numbered | Arc | Upper right quadrant (inside circular scales) |
Sine/Cosine | 1/60 of quadrant radius | Not numbered | Angle | Upper left quadrant (inside circular scales) |
Cotangent | 0 - 36, Feet | Every 6 feet | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
Cotangent | 0 - 42, Fingers | Every 6 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
Shadow square | 0 - 7, Feet | Every 1 feet | Box | Left hand vertical 'face' of the shadow square (in LL) |
Shadow square | 0 - 7, Feet | Every 1 feet | Box | Left hand bottom face of the shadow square (in LL) |
Shadow square | 0 - 12, Fingers | Every 3 fingers | Box | Right hand bottom face of the shadow square (in LR) |
Shadow square | 0 - 12, Fingers | Every 3 fingers | Box | Right hand vertical face of the shadow square (in LR) |
Terms | Zodiacal divisions, equal or unequal | Not numbered | Inner Box | Box 'inside' the shadow square. Common site for triplicities, etc. |
Transcription | Translation | Notes | Type |
---|---|---|---|
حسب الفرموده شاه مولانا فضيلت عبد الرزاق گيلانى تمام (؟) في شهر شعبان شنه ١٠٥١ | By command of the Shāh, our master, the excellent ʿAbd al-Razzāq Gilānī in Mashhad in the month of Shaʿbān in the year 1051. | None |