No. 139: Jan-Feb 2002
However, C. Ginenthal writes that H. Garland and C.O. Bannister attempted to saw through granite back in the 1920s using essentially the same method employed by Stocks -- but without success. Garland and Bannister wrote a book on their experiments, from which Ginenthal has provided the following quotation:
A consideration of the [copper and abrasive cutting] process would seem to give support to the idea that a copper-emery [or other abrasive material] process might have been used by the first Egyptians, but the author [Garland] has proved by experiment the impossibility of cutting granite or diorite by any similar means to these. But the use of emery powder anointed with oil or turpentine, no measurable progress could be made in the stone whilst the edge of the copper blade wore away and was rendered useless, the bottom and sides of the groove being coated with particles of copper.
(Garland, H., and Bannister, C.O.; Ancient Egyptian Metallurgy, London, 1927, p. 95. (Cr. C. Ginenthal.)
Comment. Garland seemed wedded to emery as the abrasive. We wonder if he tried the silica sand that seemed to work for Stocks. Perhaps he did not try hard enough.
In his new book Sticks, Stones, & Shadows, M. Isler mentions Stocks' experiments and adds that successful results were also obtained by R. Hopkinsusing Stocks' method under the auspices of the Nova/ WGBH TV program "Obelisk" circa 1994.
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