The New Encyclopaedia Britannica: Macropaedia: knowledge in depth. 19 vEncyclopaedia Britannica, Incorporated, 1981 - Encyclopedias and dictionaries |
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Page 436
... material , such as sand , grav- el , or clay . Porosity is defined as the ratio of the volume of voids to the total volume of the material under consideration . Porosity of unconsolidated materials is determined by the packing of the ...
... material , such as sand , grav- el , or clay . Porosity is defined as the ratio of the volume of voids to the total volume of the material under consideration . Porosity of unconsolidated materials is determined by the packing of the ...
Page 606
... material Paleolithic tools Neolithic tools Early metals and smelting Iron and steel tools II . Later development of hand tools Hammers and hammer - like tools Ax and adz Knife Drilling and boring tools Saw File Chisel Plane Workbench ...
... material Paleolithic tools Neolithic tools Early metals and smelting Iron and steel tools II . Later development of hand tools Hammers and hammer - like tools Ax and adz Knife Drilling and boring tools Saw File Chisel Plane Workbench ...
Page 877
... material . With little weathering , so that in effect the rock mass is a densely packed , cohesionless aggre- gate , the angle 45 ° -75 ° , as noted previously . Fur- ther weathering , particularly loosening of the surface material by ...
... material . With little weathering , so that in effect the rock mass is a densely packed , cohesionless aggre- gate , the angle 45 ° -75 ° , as noted previously . Fur- ther weathering , particularly loosening of the surface material by ...
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