Egyptian Engineering.

Issue 27 and Volume 1892 12.

Egyptian Engineering. The obelisks of the Pharaohs were cut from red syenite, a rock often miscalled granite. In the quarries of Syene, accord, ing to the writer of “Cleopatra’s Needle,” may be seen an unfinished obelisk, adhering to the native rock, and still clearly showing traces of the workmen’s tools and the method employed in separating these immense monoliths. The edge of the block is marked by a sharply cut groove, containing holes evidently bored for wooden wedges. In completing the operation, the wedges were firmly driven into place and the groove was filled with water, when the swelling of the wood split the rock throughout the length of the groove. The block was afterward slid on rollers to the edge of the Nile, Here a large raft was built about it. and at the next inundation the finished stone was floated down to where it was to be erected,…

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