In 1924 Morton Edgar published 3 books on the Great Pyramid. He is better known for his collaboration with his brother Dr John Edgar in the 2 volume set "Great Pyramid Passages." Those 2 volumes were published during C.T. Russell's lifetime and then were subsequently reprinted (with some revisions) in 1923. The Edgar brothers wrote in support of the idea that the Great Pyramid confirmed Russell's "Divine Plan" and also corroborated Russell's chronology. Russell considered the Edgar brothers good friends and even named Dr John Edgar in his will as a possible alternate for the Editorial Committee. Dr John Edgar, however, preceded Russell in death.
The 3 book set published in 1924 was entirely written by Morton Edgar and did not achieve the circulation of the "Great Pyramid Passages" set. A little background is in order. Morton Edgar was affiliated with J.F. Rutherford and was cited in support of a controversy that broke out when the "Herald of Christ's Kingdom" (the magazine published by the directors ousted by JFR) suggested that the 1914 date was in error because they were not rejecting the 606 BC date in favor of 536 BC. The Watch Tower magazine came out strong in support of Russell's chronology and the 1914 date. This chronology discussion can be found in the 1923 issues of the Watch Tower. In addition to their biblical interpretation they also cited the research of the Edgar brothers. Morton Edgar wrote a huge letter which was published in the WT defending Russell's chronology and also supported Rutherford's "Millions Now Living" work. The "Great Pyramid Passages" volumes were republished and Morton Edgar also wrote and published 3 more books on the Great Pyramid. 2 of these books were written specifically to support the 1914 chronology. These books have now been made into PDFs:
The Great Pyramid -- Its Spiritual Symbolism
http://www.catholic-forum.com/members/popestleo/The_Great_Pyramid_Its_Spiritual_Symbolism.pdf
The Great Pyramid -- Its Scientific Features: 1914 A.D. and the Great Pyramid--Part 1
http://www.catholic-forum.com/members/popestleo/The_Great_Pyramid_Its_Scientific_Features.pdf
The Great Pyramid -- Its Time Features: 1914 A.D. and the Great Pyramid--Part II
http://www.catholic-forum.com/members/popestleo/The_Great_Pyramid_Its_Time_Features.pdf
The December 31, 1924 Golden Age, pp. 209-211 refers to this latest work by Morton Edgar and even reproduces one of the maps from these volumes. That article in the Golden Age can be seen at:
http://www.catholic-forum.com/members/popestleo/g24DEC31.pdf
The first volume ("Spiritual Symbolism") has been republished by the Bible Students but I don't believe the other two (the 1914 series) ever was republished by them. Perhaps one reason is that Part II of the 1914 series volumes contains some pro-JFR comments referring to the "Millions" campaign. Interestingly, that volume also ends with a suggestion that the Great Pyramid pointed to an event due to occur on May 30, 1928 which, no doubt, fanned some of the speculations at that time.
1928 actually saw JFR's dropping of pyramidology and Morton's departure from fellowship with him. He then joined with those Bible Students who held onto Russell's views.
At any rate, I thought some researchers here would enjoy reading the PDFs of these Morton Edgar volumes.