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. |
| Declination | 1 - 12, Zodiacal sign | Not numbered | Arc | Upper right quadrant (inside circular scales) |
| Sine/Cosine | 0 - 60, 1/60 of quadrant radius | Not numbered | Arc | Upper left quadrant (inside circular scales) |
| Shadow square | 1 - 7, Feet | Every 1 feet | Box | Lower left quadrant |
| Shadow square | 1 - 12, Fingers | Every 1 fingers | Box | None |
| Cotangent | 10 - 25, Feet | Every 5 feet | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
| Cotangent | 0 - 40, Fingers | Every 5 fingers | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |