The Great pyramid : observatory, tomb, and temple
Richard A. Proctor's 1883 study from Chatto & Windus in London, arguing the Great Pyramid served as an astronomical observatory as well as a tomb, written for general readers interested in astronomy and Egyptology. The plates are line diagrams: a sectional pyramid with labelled passages and chambers, plan squares with diagonals and compass points, and measured shaft elevations with dotted survey lines and letter keys.
