| Name | Imperial Exposure Meter No.1 For Bright Light and Imperial Exposure Reckoner (Green) |
| Front Scales | Actinometer Time = H&D Stops = Time |
| Back Scales | Light Values = Weather = = Subjects Stops = Time |
| Type of Rule | slide rule |
| Material | cardboard |
| Dimension (mm) | 65x100x6 |
| Area of Use | photography |
| Origin of Rule | Herman van Herwijnen |
| Match Number | 5515 |
| Comment | |
| Thumbnail |  |