Apparatus for Calcining Plaster
Description:
This patent is for an apparatus for calcining plaster of any kind. Or an apparatus that keeps clean the inner surface of a revoluble drum for ventilating the drum during the calcining operation. The apparatus also provides for easily removing the material after the completion of the cooking operation (Lawrence, 1902).
Date:
unknown
Creator:
Lawwrence, Ambrose
Partner:
UNT Libraries Government Documents Department