Mater
The mater and limb are of other construction. On this instrument, the outer set of scales on the glass slide are treated as the limb. All of the glass is set within the Mahogany holder and affixed by means of brass ring and screws . Scales on the limb:| Type | Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Equal hours | 1 - 12 Times of day | Every 10 hours | Circular, concentric | outer |
| Degree | 0 - 90 Degrees | Every 10 degrees | Circular, concentric | outer2 |