It is built of wood, the various native timbers being happily combined.
At Fallen Timbers, Ohio (Aug.
Where each floor is timbered by itself with light timbers, as is the practice on the continent of Europe, the consolidation of the rock-filling under pressure gives rise to considerable subsidence of the unmined ore, which has frequently settled 20 ft.
Outside of these general areas, forest products are of relatively little value, the exceptions being the dense growths, in certain restricted areas, of live-oak, which is in demand for ship timbers; and scattering patches of hickory, which is requisite for certain manufactures.
In thickness, whereas in the top-slide system the height of the floor is limited by the length of the timbers used in the working-rooms, rarely over S or Io ft.