The following mixtures will flux only at a very high heat. They require no glaze when a proper heat is attained, and they are admirably adapted for stoneware glazes.

I

Cornwall stone. ...   20    parts

Feldspar.........   12    parts

China clay........     3    parts

Whiting..........     2    parts

Plaster of Paris ...     1.5  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

To run these glazes intense heat is required.

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........     1.5 parts

Sulphate barytes. ..     l.5 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............       J 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

Elate must then be fired until a sufficient eat is attained to run or fuse the powder.