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Show In North Dakota farmers use low grade dehydrated potatoes as a substitute for corn in feeding 0f sheep. 150 tons of the oxygen m a day. That quantity will be enough to permit thorough tests in blast fur- , naces in the steel industry. Oxygen 99.5 pure has been used to speed up melting m open hearth furnaces. However, it is expensive. Chemical manufacturers manufactur-ers believe oxygen 90 pure can be produce dto sell at less than $10 a ton. CHEAP OXYGEN WILL BE AVAILABLE SOON "Lowpurity" oxygen as an inexpensive inex-pensive substitute for air in furnaces fur-naces requiring enormously high temperatures will be produced this fall in a plant under construction by three American industrial companies. com-panies. The new plant will produce about |