The chemistry of pottery by Langenbeck Karl

Author:Langenbeck, Karl
Language: eng
Format: epub
Tags: Pottery
Publisher: Easton, Pa., Chemical publishing co.
Published: 1895-03-25T05:00:00+00:00

OF POTTERY.

poses, much the preference over the former. In fact, because of the deficiency of the New Jersey clays, in this particular, not inconsiderable quantities of English plastic clays, that could well be replaced by these western domestic ones, are imported.

A ball clay from Jefferson County, Missouri, of established reputation, has the composition :

Portions insoluble

in H 2 SO 4 and

The entire clay Na 3 CO 3

Per cent. Per cent.

Silica 48.51 2.85

Alumina 35-i8 0.75

Ferric oxid 0.92

Lime i .01 0.06

Magnesia 1.47 0.48

Alkalies 2.30 0.35

Combined water 10.72 o.oo

ioo.ii 4.49

Burned at the melting of pyrometric cone nine, the shrinkage of the clay is fifteen percent., and the body is not only dense from the high contraction and the characteristic structure of the plastic clays, but is vitrified as a direct result of the high percentage of fluxing oxides it contains.

A plastic clay brought into the Market from Galloway County, Kentucky, gave the following analysis :

The portion insoluble

in H 2 SO 4 and

The entire clay Na 2 CO 3

Percent. Per cent.

Silica 59.83 26.02

Alumina 27.80 0.29

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