| RefNo | AP/34/10/3 |
| Level | Item |
| Title | Unpublished figure, crystals at right angles to each other by William Bird Herapath |
| Creator | Herapath; William Bird (1820-1868); English surgeon; chemist |
| Date | 19 January 1854 |
| Description | A figure in black and green ink, labelled figure 4, illustrating how 'when two crystals, at right angles to each other [...] so placed as to lie in superposition, the quadrangular or other shaped space of overlapping [is] perfectly black and impervious to light'. The figure shows further, smaller crystals overlapping a large crystal at various labelled angles.
Subject: Chemistry / Optics |
| Extent | 1p |
| Format | Drawing |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA7695 | Herapath; William Bird (1820 - 1868); surgeon | 1820 - 1868 |