| I.— | Cornwall stone | 20 parts |
|---|
| Feldspar | 12 parts |
| China clay | 3 parts |
| Whiting | 2 parts |
| Plaster of Paris | 1 1/2 parts |
| II.— | Feldspar | 30 parts |
|---|
| Flint | 9 parts |
| Stone | 8 parts |
| China clay | 3 parts |
| III.— | Feldspar | 20 parts |
|---|
| Stone | 5 parts |
| Oxide of zinc | 3 parts |
| Whiting | 2 parts |
| Plaster of Paris | 1 part |
| Soda crystals, dissolved | 1 part |
Special Glazes For Bricks Or Pottery At One Burning.
| I.— | Cornwall stone | 40 parts |
|---|
| Flint | 7 parts |
| Paris white | 4 parts |
| Ball clay | 15 parts |
| Oxide of zinc | 6 parts |
| White lead | 15 parts |
| II.— | Feldspar | 20 parts |
|---|
| Cornwall stone | 5 parts |
| Oxide of zinc | 3 parts |
| Flint | 3 parts |
| Lynn sand | 1 1/2 parts |
| Sulphate barytes | 1 1/2 parts |
| III.— | Feldspar | 25 parts |
|---|
| Cornwall stone | 6 parts |
| Oxide of zinc | 2 parts |
| China clay | 2 parts |
| IV.— | Cornwall stone | 118 parts |
|---|
| Feldspar | 40 parts |
| Paris white | 28 parts |
| Flint | 4 parts |
| V.— | Feldspar | 16 parts |
|---|
| China clay | 4 parts |
| Stone | 4 parts |
| Oxide of zinc | 2 parts |
| Plaster of Paris | 1 part |
| VI.— | Feldspar | 10 parts |
|---|
| Stone | 5 parts |
| Flint | 2 parts |
| Plaster | ․1/2 part |
The following glaze is excellent for bricks in the biscuit and pottery, which require an easy firing:
White.—
| White lead | 20 parts |
| Stone | 9 parts |
| Flint | 9 parts |
| Borax | 4 parts |
| Oxide of zinc | 2 parts |
| Feldspar | 3 parts |
These materials should be procured finely ground, and after being thoroughly mixed should be placed in a fire-clay crucible, and be fired for 5 or 6 hours, sharply, or until the material runs down into a liquid, then with a pair of iron tongs draw the crucible from the kiln and pour the liquid into a bucket of cold water, grind the flux to an extremely fine powder, and spread a coating upon the plate to be enameled, previously brushing a little gum thereon. The plate must then be fired until a sufficient heat is attained to run or fuse the powder.
Pottery Bodies And Glazes:
Ordinary.—
| I.— | China clay | 2 1/2 parts |
|---|
| Stone | 1 1/2 parts |
| Bone | 3 parts |
| II.— | China clay | 5 parts |
|---|
| Stone | 2 1/2 parts |
| Bone | 7 parts |
| Barytes | 3 parts |
| III.— | Chain clay | 5 parts |
|---|
| Stone | 3 parts |
| Flint | 1/4 part |
| Barytes | 8 parts |