- PLATE FOURTH.
- A Cupelling Furnace.
- A. The Ash-hole.
- B. B. Its sliding Doors.
- C. The Fire-place.
- D. D. Its sliding Doors.
- E. F. Small apertures in the Sliders.
- G. G. Holes for Bars to bear the Muffles.
- H. H. H. Iron braces in the fore-part of the Furnace, which form grooves for the Doors of the Fire-place and Ash-hole to slide in.
- I. The upper pyramidal part of the Furnace.
- K. An aperture therein for managing the Coals.
- L. The opening at top.
- M. The Pyramidal Cover.
- N. The Chimney or end of the Shaft, on which the conical Funnel may be fitted.
- O. O. O. O. Handles for moving the sliding Doors.
- P. P. Ears of the Pyramidal Cover.
N. B. The Furnaces, as represented in the two last Plates, are not in due proportion to each other. The Cupelling Furnace is much larger than it should be, with respect to the Melting Furnace. These dimensions are here given it, only that all its parts might be more distinctly expressed, than could have been done if we had made it less.
| GEOFFROY'S TABLE of the COMPARATIVE AFFINITIES | ||
|---|---|---|
| observed between sundry substances. | ||
| I. | II. | III. |
| Acid Spirits | Marine Acid | Nitrous Acid |
| Fixed Alkali | Tin | Iron |
| Volatile Alkali | Regulus of Antimony | Copper |
| Absorbent Earths | Copper | Lead |
| Metallic Substances | Silver | Mercury |
| Mercury | Silver | |
| Gold | ||
| IV. | V. | VI. |
| Vitriolic Acid | Absorbent Earths | Fixed Alkali |
| Phlogiston | Vitriolic Acid | Vitriolic Acid |
| Fixed Alkali | Nitrous Acid | Nitrous Acid |
| Volatile Alkali | Marine Acid | Marine Acid |
| Absorbent Earths | Spirit of Vinegar | |
| Iron | Sulphur | |
| Copper | ||
| Silver | ||
| VII. | VIII. | IX. |
| Volatile Alkali | Metallic Substances | Sulphur |
| Vitriolic Acid | Marine Acid | Fixed Alkali |
| Nitrous Acid | Vitriolic Acid | Iron |
| Marine Acid | Nitrous Acid | Copper |
| Lead | ||
| Silver | ||
| Regulus of Antimony | ||
| Mercury | ||
| Gold | ||
| X. | XI. | XII. |
| Mercury | Lead | Copper |
| Gold | Silver | Mercury |
| Silver | Copper | Calomine |
| Lead | ||
| Copper | ||
| Zinc | ||
| Regulus of Antimony | ||
| XIII. | XIV. | XV. |
| Silver | Iron | Regulus of Antimony |
| Lead | Regulus of Antimony | Iron |
| Copper | Silver, Copper, Lead | Silver, Copper, Lead |
| XVI. | ||
| Water | ||
| Ardent Spirits | ||
| Neutral Salts | ||