Notes on Pot Attack (10 pages including discussion on all the papers from T262 to T294)

JSGT 1918 V02 T285-T294  (10 pages including discussion on all the papers from T262 to T294)

During the past three years I have been working at the National Physical Laboratory, under Dr Rosenhain, on problems connected with refractory materials with specia1 reference to the production of optical glass; and, although the work is still far from complete, it seems worthwhile to record some, observations made during the course of the work, in the hope that, by so doing, they may provoke useful discussion and perhaps stimulate research work along lines which have hitherto been untouched (so far as I can gather from work previously published). As a result of many experiments with pots of different porosity and composition, and using several different types of glasses, it was found that the bottom of the pot was invariably attacked more-than-the sides and that the rod after the melt was always tapered, with the thin end downwards. This preferential attack on the bottom of the pot has been confirmed on a larger scale with pots having a capacity up to 20 or 30 lb. The relation between the amount of pot dissolved and the depth below the surface of the glass was roughly linear over the small range measured

E. A. Coad-Pryor