| Reference Number | WJTS/1/6 |
| Title | 6 - Petty's Census 1642 |
| Date | [1910s] |
| Creator Name | Mason, Thomas Holmes, 1877-1958 |
| Thompson, Sir William John, 1861-1929 |
| Description | Glass lantern slide with text from Sir William Petty's 1642 census comparing the number 'who are blind, lame and under incurable impotence' in nature with the number in Ireland. |
| Extent | 1 slide |
| Term | Censuses |
| Blindness |
| Disabled Persons |
| Population Characteristics |