| RefNo | AP/34/10/11 |
| Level | Item |
| Title | Unpublished figures, crystal structures by William Bird Herapath |
| Creator | Herapath; William Bird (1820-1868); English surgeon; chemist |
| Date | 19 January 1854 |
| Description | Two figures in black ink, labelled figures 19-20, illustrating the structure of two crystals and showing how they interact with light as they are rotated.
Subject: Chemistry / Optics |
| Extent | 1p |
| Format | Drawing |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |