The back contains 4 scales of the following types:
Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
---|---|---|---|---|
Zodiacal signs | 0 - 30, Zodiacal divisions, equal or unequal | Every 10 | Circular, concentric | Circular scale immediately inside the outer scale - refers to the full circle |
Altitude | 0 - 90, Degrees | Every 10 degrees | Circular, concentric | Upper right quadrant of outer circular on back of instrument. |
Calendar | first day of month - last day of month, Days of year | Every 10 days | Circular, concentric | Circular scale second in from the outer scale - refers to the full circle. |
Shadow square | 0 - 12, Fingers | Every 4 fingers | Box | Left hand vertical 'face' of the shadow square (in LL) |
Shadow square | 0 - 12, Fingers | Every 4 fingers | Box | Left hand bottom face of the shadow square (in LL) |
Shadow square | 0 - 12, Fingers | Every 4 fingers | Box | Right hand bottom face of the shadow square (in LR) |
Shadow square | 0 - 12, Fingers | Every 4 fingers | Box | Right hand vertical face of the shadow square (in LR) |