arble is attained. ous breakages. When successfully turned, the other taken from the cooled leer is covered with plaster of +0 _—_—_—_|— side is ground. For the grinding operations the Paris, and one of the beds of the grinding machine is Coal Consumed in Cities of the United States. lowered onit.… … gine and boiler for actuating all the parts of the ma- 1,698,955 tons anthracite and 3,616,876 tons bitumin- Plan view of ventilating chine. Duplicate beds on which the glass is rolled are ous. Theabove figures include allcoal used by rail- provided, flat tables of metal, one of which only is in…
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