Part 104

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

«Superior.»—

I.—China clay 35 parts Cornwall stone 23 parts Bone 40 parts Flint 2 parts {168}

II.—China clay 35 parts Cornwall stone 8 parts Bone 50 parts Flint 3 parts Blue clay 4 parts

III.—China clay 8 parts Cornwall stone 40 parts Bone 29 parts Flint 5 parts Blue clay 18 parts

IV.—China clay 32 parts Cornwall stone 23 parts Bone 34 parts Flint 6 parts Blue clay 5 parts

V.—China clay 7 parts Stone 40 parts Bone 28 parts Flint 5 parts Blue clay 20 parts

«Finest China Bodies.»—

I.—China clay 20 parts Bone 60 parts Feldspar 20 parts

II.—China clay 30 parts Bone 40 parts Feldspar 30 parts

III.—China clay 25 parts Stone 10 parts Bone 45 parts Feldspar 20 parts

IV.—China clay 30 parts Stone 15 parts Bone 35 parts Feldspar 20 parts

«Earthenware Bodies.»—

I.—Ball clay 13 parts China clay 9 1⁠/⁠2 parts Flint 5 1⁠/⁠2 parts Cornwall stone 4 parts

II.—Ball clay 12 1⁠/⁠2 parts China clay 8 parts Flint 5 1⁠/⁠2 parts Cornwall stone 2 1⁠/⁠2 parts One pint of cobalt stain to 1 ton of glaze.

III.—Ball clay 13 1⁠/⁠4 parts China clay 11 parts Flint 4 parts Cornwall stone 5 parts Feldspar 4 parts Stain as required.