The back contains 5 scales of the following types:
| Type (click to view scale details) |
Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Altitude | 0 - 90, Degrees of arc | Every 10 degrees | Circular, concentric | outermost scale on the front of the limb |
| 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 |
| Unequal hours | 1 - 12, 1/12 of daylight | Every 1 hours | Arc | Upper left quadrant (inside circular scales) |
| Unequal hours | 1 - 12, 1/12 of daylight | Every 1 hours | Arc | Upper right quadrant (inside circular scales) |
| Shadow square | 1 - 12, Feet | Every 3 feet | Box | Left hand vertical 'face' of the shadow square (in LL) |
| Shadow square | 1 - 12, Feet | Every 3 feet | Box | Right hand vertical face of the shadow square (in LR) |
| Shadow square | 1 - 12, Feet | Every 3 feet | Box | Left hand bottom face of the shadow square (in LL) |
| Shadow square | 1 - 12, Feet | Every 3 feet | Box | Right hand bottom face of the shadow square (in LR) |
| Transcription | Translation | Notes | Type |
|---|---|---|---|
| SIT NOMEN DOMINI BENEDICTVM IN SECVLA SECVLORVM 1595 | Hallowed be Thy name for all eternity, 1595 | In the center of this inscription is 'IHS', a cross and a pierced heart | Prayer |