Hour conversion
| Type: | Hour conversion |
| Style: | Hour-conversion scale |
| Geometry: | Arc |
| Unit of measurement: | Times of day |
| (Numbering) starts at: | 0 |
| (Numbering) ends at: | 12 |
| Numbered: | every hour |
| Repeats: | 1 times |
| Divided every: | 20 (Times of day) |
| then every: | 4 (Times of day) |
| Notes: | Equal hour lines at half-hour intervals within the semi-circle of the scale |
Scale located on: Tympan, Womb or Back .
Inscription(s):
| Type: | Scale label |
| Content: | Horae / inae / quales |
| Translation: | Unequal hours |
| Language: | Latin |
| Script: | Italic |
| Notes: | Divided around the scale (as shown) with intervening numerals |
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| Type: | Scale label |
| Content: | Horae ante meridiem / Horae post meridiem |
| Translation: | |
| Language: | Latin |
| Script: | Italic |
| Notes: | Labelled below the horizontal line |
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