The 47th Problem of Euclid in Freemasonry - Hardcoverby H. P. H. Bromwell (Author) The 47th Problem of Euclid in Freemasonry is a book written by H. P. H. Bromwell that explores the significance of the 47th problem of Euclid in Freemasonry. The book delves into the history of Freemasonry and the symbolism behind the 47th problem of Euclid, which is also known as the Pythagorean theorem. Bromwell explains how this theorem is used as a symbol in Freemasonry to represent the importance of harmony and