Altitude
| Type: | Altitude |
| Style: | 90° - 0° - 90° running clockwise in semi-circle from 170° point - centre of arc @ 90° point (throne) |
| Geometry: | Circular, concentric |
| Unit of measurement: | Degrees of arc |
| (Numbering) starts at: | 0 |
| (Numbering) ends at: | 90 |
| Numbered: | every 5 |
| Repeats: | 2 times |
| Divided every: | 5 (Degrees of arc) |
| then every: | 1 (Degrees of arc) |
Scale located on: Tympan, Womb or Back .
Location(s) detail:
| 1: | Upper right quadrant of outer circular on back of instrument. (1) |
| 2: | Upper left quadrant of outer circular on back of instrument. (2) |