. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. DRILLING IN STONE WITHOUT METAL. 393 li^.l. sliaft-liolcs are likewise more or loss smooth, but destitute of the annular stria?, and sometimes narrower in the middle, in wliich cases, of course, a circular })ro- tuberauce of coiTespondint^size is formed. (Fig. 1.) These holes evidently were drilled I'roni two sides, and the drilling" implement was not a hollow cylin- der, but a solid body, prt)bably a wooden stick. ]\Iost of the axes a
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. DRILLING IN STONE WITHOUT METAL. 393 li^.l. sliaft-liolcs are likewise more or loss smooth, but destitute of the annular stria?, and sometimes narrower in the middle, in wliich cases, of course, a circular })ro- tuberauce of coiTespondint^size is formed. (Fig. 1.) These holes evidently were drilled I'roni two sides, and the drilling" implement was not a hollow cylin- der, but a solid body, prt)bably a wooden stick. ]\Iost of the axes and hammers provided with shaft- holes of this character are perhaps relics of the age of stone. It is hardly necessary to state that with- out the application of water and hard sand, drilling with either implement, hollow or solid, would have been impossible, and that the sand is to be considered as the chief agent in the process. I had occasion to examine a number of European stone hatchets and hammers, which were in an unfinished state, the shaft-holes being only commenced or drilled half through, and the appearance of the latter perfectly corroborated my view concerning the different shapes of the drills used in making them ; for some of these unfinished holes, and just such as belong to the striated class, have at the bottom a conical projection or a core, (Fig. 2,) which obviously resulted from the application of a hollow drilliuii" implement; while lH(i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
Size: 1361px × 1836px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
