PHASE-EQUILIBRIUM CONSTRAINTS ON KILN TEMPERATURES AT THE EBY POTTERY (ca. 1857-1905), CONESTOGO, ONTARIO
Bibliographic record
Abstract
Samples from the Eby pottery, in Conestogo, Ontario, that have been distorted by a high degree of partial melting contain both relict temper (sand) grains, liquidus minerals (low-Ca pyroxene and calcic plagioclase with quenched morphologies), and coronal minerals formed by peritectic-like reactions between temper and melt. The coronal minerals include low-Ca pyroxene (enstatite or protoenstatite) on diopside temper, and ternary feldspar on K-feldspar temper. They only loosely constrain firing conditions (~1373, 990°C, respectively), as indicated by phase diagrams. Assuming relatively reducing conditions (QFM buffer) consistent with the dark grey color of the distorted Eby samples, modeling of melt compositions indicates that small amounts of liquidus orthopyroxene started to form at about 1150–1125°C, and was joined by plagioclase after the melt cooled to about 1050–1030°C, consistent with the results of plagioclase–melt thermometry applied to quenched crystals. In more aluminous samples, plagioclase was relatively calcic, and preceded pyroxene on the liquidus. The similarity of the bulk compositions of successfully fired and distorted Eby pottery shows that the distorted samples were casualties of uncontrolled temperatures in the kiln rather than a relatively non-refractory paste. Extensive melting of the Eby samples nonetheless occurred at temperatures near the upper part of the range commonly inferred for historical “low-fired” pottery.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
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".