HOFFMAN MARINE STOKERS BATTERY INSTALLATION IN THREE-FURNACE SCOTCH MARINE BOILERS USING PRE-HEATED AIR S S SENSIBAR IN RECONSTRUCTING THE POWER PLANT OF THE S S SENSIBAR, THE COLUMBIA TRANSPOR- TATION CO., SELECTED HOFFMAN MARINE STOKERS TO OBTAIN MAXIMUM STEAM OUT- PUT FROM EXISTING BOILERS. HOFFMAN COMBUSTION ENGINEERING Co. INDUSTRIAL STOKERS GENERAL OFFICES: MARQUETTE BLDG. DETROIT, MICH 57