Annual report of the Regents . pq op. o 00 a; Pi a; c H 05 03. 3 rn hr (U oi X ca a:: ^ CLAYS OF NEW YORK 809 Artificial glazes are used to some extent on the better grade ofstoneware made at the present day. Stoneware is sometimes coated with a slip of white clay. Burning stoneware Stoneware is commonly burned in round kilns. The articlesare piled one on top of the other till the kiln is filled, but theyare set in such a way as not to interfere with an even draft through-out the kiln, and the larger pieces are placed in the center. Ifboth salt glazed and slip glazed wares are burned in the ki
Annual report of the Regents . pq op. o 00 a; Pi a; c H 05 03. 3 rn hr (U oi X ca a:: ^ CLAYS OF NEW YORK 809 Artificial glazes are used to some extent on the better grade ofstoneware made at the present day. Stoneware is sometimes coated with a slip of white clay. Burning stoneware Stoneware is commonly burned in round kilns. The articlesare piled one on top of the other till the kiln is filled, but theyare set in such a way as not to interfere with an even draft through-out the kiln, and the larger pieces are placed in the center. Ifboth salt glazed and slip glazed wares are burned in the kiln at thesame time, the latter have to be protected from the salt vapor insome way. The time of burning depends partly on the size of the kiln, aridpartly on the clay. It may be as short as 30 hours or as long as 90. The temperature attained in burning stoneware also depends onthe clay. Experiments made in Ohio show that the temperatureranges from about 1850° to 2000° F. Other experiments madeby the writer indicate that in the case of the New Jersey semi-f
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