Society of Glass Technology · [Sheffield] · leaf 667
f potash in thedrillings from wells that were being sunk for oil. No productionwas reported from alunite, silicate rocks, kelp, or wool washings.The only companies which reported continuous operation of theirpotash plants throughout the year produced their material as aby-product in the manufacture… … Fig. 181. II.—Glass : Manufacture and Properties. 315. Moulding Glass Objects by Centrifugal Force. H. P.Amphlett and Hume Pipe and Concrete Construction Co.,Ltd., Westminster, London (Brit. Pat., No. 176737, October 30th,1920).—Moulding by centrifugal force.—A hollow or perforatedblank of vitreous…
Glass
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