Almucantars
| Divisions | Labelled | Style |
|---|---|---|
| Divided every 2° from 0° to 90° | Labelled every 10° with (Modern) numerals | Plain line. |
| Tympan | 1a |
| Latitude | 51°0' |
Azimuths
| Divisions | Labelled | Style |
|---|---|---|
| Divided every 10° | Labelled every 10° with (Modern) numerals | Plain line. |
Lines
| Type | Labelled | Description |
|---|---|---|
| Horizon obliquus | Eastern Horizon Western Horizon (English in Mixed script) |
Inscriptions
| Transcription | Translation | Type |
|---|---|---|
| LAT 51 1/2° | Latitude | |
| MANUFACTURED BY W. WATSON & SONS, LTD., 313 HIGH HOLBORN, LONDON, W.C.1. | Maker's signature |
Scales
| Type | Range & Units | Numbered | Geometry | Location |
|---|---|---|---|---|
| Declination | 0 - 23.5 Degrees | Every 10 degrees | Linear | n/a |
| Declination | 0 - 60 Degrees | Every 10 degrees | Linear | n/a |
| Declination | 0 - 118 Degrees | Every 10 degrees | Linear | n/a |