DOUBLE CORONA STRUCTURES IN 18TH CENTURY PORCELAIN (1st PATENT BOW, LONDON, mid-1740s): A RECORD OF PARTIAL MELTING AND SUBSOLIDUS REACTIONS
Bibliographic record
Abstract
Double corona structures separating relict glass frit from metakaolinite in a teapot lid excavated from the Bow porcelain factory site in Stratford, east London record a history of partial melting and subsequent subsolidus reaction between the quenched melt phase and metakaolinite. The sample has an aluminous-siliceous-calcic composition consistent with1 st patent (1744) Bow porcelain. This patent specified a ceramic paste containing an alkali-lime glass frit and kaolin. The glass behaved as an alkali delivery system to the clayey matrix of the ware. Diffusion of alkalis commenced at subsolidus temperatures (probably in the glass transition), rendering the relict frit relatively refractory. Partial melting subsequently occurred near the interface between the relict frit particles and the fluxed clayey matrix. This created inner, quenched melt (glass) coronas on the frit, now represented by symplectic intergrowths of a silica polymorph, diopside ± pseudowollastonite. The outer edge of the glass coronas served as a crystallization front from which calcic plagioclase (~An 62 ) microlites grew, extracting CaO from the coronal glass as they advanced into the metakaolinite matrix, gradually consuming it. These outer, labradorite coronas are porous, suggesting that this was a subsolidus process. Unlike soluble alkali carbonates used in some other porcelain pastes, the glass frit represented a point source of fluxing components. The proportion, composition, grain size, and distribution of this phase therefore controlled the melt fertility of the paste on a domainal scale in this sample.
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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 | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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".