Official documents, comprising the department and other reports made to the Governor, Senate and House of Representatives of Pennsylvania . h irontower, with forced draught, where it is subjected to the action of theair and is subsequently conveyed to the grinding machinery. 74 DEPARTMENT OF INTERNAL AFFAIRS—STATISTICS. Off. Doc. Criisliing and Grinding Machinery.—When under the Americanprocess it became possible to make cement from practically dry ma-terial, as is the case with more than three-fourths of all that is pro-duced in this country, a great economy was effected, both in the fuelcons
Official documents, comprising the department and other reports made to the Governor, Senate and House of Representatives of Pennsylvania . h irontower, with forced draught, where it is subjected to the action of theair and is subsequently conveyed to the grinding machinery. 74 DEPARTMENT OF INTERNAL AFFAIRS—STATISTICS. Off. Doc. Criisliing and Grinding Machinery.—When under the Americanprocess it became possible to make cement from practically dry ma-terial, as is the case with more than three-fourths of all that is pro-duced in this country, a great economy was effected, both in the fuelconsumption and in the handling of the material before calcina-ation. To drive out the moisture from the wet material, in somecases 50 to GO per cent, of its total weight, a very large proportion ofheat had to be used aid nearly one-half of the fuel consumed was f-orthe purpose of expelling this water, either added to or found com-bined in the raw material. It is needless to say that this wateradded also the bulk of the raw material, and required handling atall the stages of the process, up to and including the process
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