Some Remarks on Glass-house Pots

JSGT 1928 V12 T141-T146

 I am rather shocked at the poor results in service which are indicated in some cases in Proffesor. Turner's survey of existing conditions; for it is evident that most of the factories melting potash–lead oxide–silica glass are not getting the best out of their pots. In my opinion, the poor results obtained by this section of the trade are due to insufficient heating of the pots before putting them into use. The Stourbridge pot-clays do not reach maturity in resistance to corrosion unless soaked for a very long period at 1300°, which appears to be the highest temperature reached in some of these furnaces. I would quite expect a factory using pots of Stourbridge clay, in a furnace only working at 1300°, to be troubled with stones if the pots were put to immediate use in less than 48 hours of setting; for the clay surrounding the grog particles would be insufficiently burnt and more easily attacked than the grog, thus setting the grog free to float off into the glass.

Percival Marson