The back contains 6 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. |
| Azimuth of Qibla | Cities | Arc | Upper right quadrant (inside circular scales) | |
| Cotangent | 0 - 30, Feet | Every 5 feet | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
| Cotangent | 0 - 35, Fingers | Every 5 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
| Shadow square | 0 - 6, Feet | Every 2 feet | Box | Left hand vertical 'face' of the shadow square (in LL) |
| Shadow square | 0 - 6, Feet | Every 2 feet | Box | Left hand bottom face of the shadow square (in LL) |
| Shadow square | 0 - 12, Fingers | Every 2 fingers | Box | Right hand bottom face of the shadow square (in LR) |
| Shadow square | 0 - 12, Fingers | Every 2 fingers | Box | Right hand vertical face of the shadow square (in LR) |