| RefNo | RB/1/26/45 |
| Previous numbers | BP 26, fols. 154-61 |
| Level | Item |
| Title | 'Sectio II' |
| Date | ? 1680s |
| Description | Part of unpublished 'Mechanical Origin of Light'.\r\nHand: Ramsay |
| Language | English |
| Extent | Fols. 154-61 (8 leaves) |
| Format | Manuscript |
| AccessStatus | Open |
| RelatedMaterial | Published in 'Works', vol. 14, pp. 32-8. |