| RefNo | AP/36/16/2 |
| Level | Item |
| Title | Unpublished diagram, the principal focus of the microscopic object-glass by William S Gillet |
| Creator | Gillet; William S (fl 1854) |
| Date | 1854 |
| Description | A diagram representing Gillet's method for identifying the principal focus of the microscopic object-glass.
Subject: Optics |
| Extent | 1p |
| Format | Diagram |
| PhysicalDescription | Ink on paper |
| AccessStatus | Open |