| Information requests | |
| 1 | Improving content on photographic techniques |
| Examples | |
| 2 | Physionotrace |
| Contemporary descriptions | |
| 3 | Thomas Jefferson and Charles Willson Peale on Hawkins's physiognotrace (1803) |
| 4 | Physionotrace machines |
| Information requests | |
| 1 | Improving content on photographic techniques |
| Examples | |
| 2 | Physionotrace |
| Contemporary descriptions | |
| 3 | Thomas Jefferson and Charles Willson Peale on Hawkins's physiognotrace (1803) |
| 4 | Physionotrace machines |