e pressure of the commi- nuted rock or earth below, the latter enters the cylinder, and is thus removed. Fig. In Fig. 4, a is a plan and elevation of an auger used for boring in clay or loam; fi is an S chisel for hard rock; c ex hibits a hollow valved auger, for boring through sand or bringing up… … Ifartk-borh}? Auger. > 1875 SCIENTIFIC AMERICAN, INC.
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