Annual report of the Regents . CD dft oo o I-H. p. .a ^ CLAYS OF NEW YORK 761 The red owes its color to the higher state of oxidation of theiron; the lower percentage of lime is due probably to its havingbeen leached out of the red clay by percolating surface waters. Elm Point, L. I. This clav was used for a time bv the i!^ewYork architectural terra cotta co., and also for stoneware, underwhich head it is described. Terra cotta manufacture It rarely happens that terra cotta is made from one clay, itbeing usually found necessary to mix several different ones to getthe best results. In addition
Annual report of the Regents . CD dft oo o I-H. p. .a ^ CLAYS OF NEW YORK 761 The red owes its color to the higher state of oxidation of theiron; the lower percentage of lime is due probably to its havingbeen leached out of the red clay by percolating surface waters. Elm Point, L. I. This clav was used for a time bv the i!^ewYork architectural terra cotta co., and also for stoneware, underwhich head it is described. Terra cotta manufacture It rarely happens that terra cotta is made from one clay, itbeing usually found necessary to mix several different ones to getthe best results. In addition to this a certain amount of sand orground,brick is added to prevent excessive shrinkage. The clay and fire brick are ground in a dry pan; and the mixingis done in a pug mill. The clay is then stored in bins till used;and before the clay is sent up to the molding room it is put throughanother pugging. A model is first made of every object to be constructed. Forsimple forms of straight outline this can be done with the aid ofa templet. Thus, if
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Keywords: ., bookauthorne, bookcentury1800, bookdecade1880, booksubjectscience
