The back contains 7 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Altitude | 0 - 90, Degrees | Every 6 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
| Altitude | 0 - 90, Degrees | Every 6 degrees | Circular, concentric | Upper left quadrant of outer circular on back of instrument. |
| Degree | Degrees | Not numbered degrees | Circular, concentric | Lower left quadrant of outer circular on back of instrument. |
| Degree | Degrees | Not numbered degrees | Circular, concentric | Lower right quadrant of outer circular on back of instrument. |
| Sine/Cosine | None | Not numbered | Angle | Upper left quadrant (inside circular scales) |
| Shadow square | 1 - 12, Fingers | Every 1 fingers | Box | Left hand vertical 'face' of the shadow square (in LL) |
| Shadow square | 1 - 12, Fingers | Every 1 fingers | Box | Left hand bottom face of the shadow square (in LL) |
| Shadow square | 1 - 7, Feet | Every 1 feet | Box | Right hand bottom face of the shadow square (in LR) |
| Shadow square | 1 - 7, Feet | Every 1 feet | Box | Right hand vertical face of the shadow square (in LR) |