refractory clay

Refractory Lining.—The interior lining of the generator should be made of refractory clay of the best quality.

Generators.—The generator consists of a retort made of refractory clay, vertically mounted, and cylindrical or conical in form.

It is essential that the retorts should be vertically placed, that they be made only of cast metal and not of refractory clay, and, finally, that their diameter be not much more than 10 inches, which size has been found most expedient in practice.

For casting purposes a refractory clay containing a good percentage of China clay, maturing at about 03-01 but remaining perfectly white and porous, will be required.

The reliefs, so finely modelled by Flaxman, were fired, and from them moulds of a very refractory clay were made, called pitcher moulds.