Applying Nanoscience to Daguerreotypes: Understanding and Preserving the First Form of the Photograph / Appliquer la nanoscience aux daguerréotypes : comprendre et préserver la première forme de photographie
Bibliographic record
Abstract
This research describes a preliminary study conducted as part of a collaboration between Western University (London, Ontario) and the Canadian Photography Institute of the National Gallery of Canada (NGC). Daguerreotypes with varying degrees of deterioration were supplied by the NGC conservation department’s study collection. Synchrotron- and laboratory-based techniques were used to examine the plates before they were electrocleaned. Synchrotron-based X-ray absorption spectroscopy and X-ray fluorescence microscopy, conducted at the Canadian Light Source (Saskatoon, Saskatchewan), enabled a chemical characterization of the surface alongside fluorescence mapping. Rapid-scanning fluorescence imaging recorded at the Cornell High Energy Synchrotron Source (Ithaca, New York) showed that the fluorescence signal from mercury could be used to retrieve images obscured by chemical and physical deterioration. The improved electrocleaning set-up established at the NGC and the implications of the subsequent studies are discussed.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".