. Official proceedings . TERS FEED WATER HEATERS , EXHAUSTSTEAM INJECTORS AND PYROMETERSFOR LOCOMOTIVES 60 EAST 42NO STREET qpU£ SUPERHEATER COMPANY ^^^^^^ gas YORK »««•-• WW ar -j«>,.,»mm-.*-m.««-i»^ ^^ ^-u.,-. • CHICAGO yOFF\C\/<U PROCEEDINGS. ^KTlcar 25* IcrGiipy JANUARY 22, 1931 MODERN COAL INDUSTRY By THOMAS H. QUEER, Sales Engineer, Pittsburgh Coal Company, Pittsburgh, Pa.

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