American Clay Works and Supply Company 857 Bryant, Alpine 1261 Mr Howard Montague. (Alpine 1261) use two clays, buy one from Perfect. who calls the clay his "black special" A fairly plastic soft clay. Other from H.G. Johnson at Castle Rock who works. Has greater shrinkage and fired to deeper red, between 2 get desired results. C.R. clay softer, easier to crush. Raw clay consumption - 500 tons / yr. Half x Half Production: Flower pots Test Run on clays used. Drop back for this. Can't piece burned down in Summer 1952 Castle Rock clay has very high modulus of tecture in raw state.