Show the production of mao in the united states is reported by dr joseph struthers in mineral resources of the united states 1901 now in press published by the united stated geological survey as amounting in 1901 to short tons valued at as compared with 2252 short tons valued at in 1900 the consumption during 1901 amounted to short tons a considerable increase resulting from its extensive use as a refractory lining for open hearth furnaces and converters in the steel industry as a lin ing for rotary kilns kalns used in the manufacture of portland cement and as a conducting non covering for boilers steam pipes etc to prevent the loss of heat when mao is treated with sulphuric acid epsom salts is produced as a product byproduct by the production of which d during aring 1901 is estimated at pounds is also used in the manufacture f of carbonic dioxide gas for carbonar ing mineral waters and other beverages the imports in 1901 amounted to short tons as compared with short tons in 1900 the supply being derived mainly from the island of in from shyria in austria |