The Great Pyramid : observatory, tomb, and temple (1888)
Proctor, Richard A. (Richard Anthony), 1837-1888 · London : Longmans, Green · leaf 153
be roughly about 175 paces long, so thatsuch a distance as a.w., or a.O would only be about62 yards (the length of the Grand Gallery beingabout 52 yards). Thus there would be thirteen observers ofazimuthal directions and altitudes, whose workwould be combined with that of at least seventransit… … Fig. 10.—Vertical Section through the Grand Gallery, THE PROBLEM OF THE PYRAMIDS. 141 fixed transit instruments in the gallery itself, theothers armed perhaps with astrolabes, armillaryspheres for reference, direction-tubes, or ring-carry-ing rods) would be able to make observations onlyinferior in…
