thus Egypt appeared to the Greeks
Thin section, in polarized light, of a portion of the Shaft of the Egyptian Obelisk erected in Central Park, New York.
cropped from dark background.
Illustrating Persifor Frazer,
Notes from the Literature on the Geology of Egypt, and Examination of the Syenitic Granite of the Obelisk which Lieut. Com’d’r Gorringe, U.S.N., Brought to New York. Transactions of the American Institute of Mining Engineers XI (May 1882 to February 1883) : 353-366
25 November 2012
tags: polarised light; rounds; ruination; Persifor Frazer; examination of the synetic granite (1883)