...grate surface. Both were new, and had never been before heated. They were set alike in brickwork, and entirely separated by masonry ; the gaseous products...flue underneath each boiler, and passed directly into tbe same chimney. At first both boilers were tilled, . and fires were kept under them for several days...

...square feet, and 12 square feet of grate surface. Both were new, and had never been before heated. They were set alike in brick-work, one above the other,...then received exactly 712 cubic feet of water at 95° F. temperature; the man-holes were closed, and the water was heated to the boiling-point ; again the...

...square feet, and 12 square feet of grate surface. Both were new, and had never been before heated. They were set alike in brick-work, one above the other,...then received exactly 712 cubic feet of water at 95° F. temperature; the man-holes were closed, and the water was heated to the boiling-point j again the...

...of 293 square feet, and 12 square feet of surface. Both were new, and had never been before heated. They were set alike in brickwork, one above the other,...then received exactly 712 cubic feet of water at 95° Fahr. temperature ; the manholes were closed, and the water was heated to the boiling point ; again...