The Great Pyramid : observatory, tomb, and temple (1888)
Proctor, Richard A. (Richard Anthony), 1837-1888 · London : Longmans, Green · leaf 102
f the horizontal base,there would be the difficulty of determining theprecise position of points under the raised line ; for THE PROBLEM OF THE PYRAMIDS. 93 manifest difficulties would arise in letting fallplumb-lines from various points along the opticalaxis of a raised tubing. But nothing could… … Fig. 3. Showing how the Builders of the Pyramid probably OBTAINED THEIR BaSE. directly to the pole-star s when due north, startingtheir boring by reference to the rough north-and-south line D B, but guiding it as they went on bynoticing whether the pole-star, when due north,remained visible along…
