Masonic Horseshoe with the 

47th Problem of Euclid

This is a "lucky" Masonic Horseshoe that used to hang over a Masons front door!  It pictures the working tools of Freemasonry and the All-Seeing Eye into the framework of Euclid's 47th Problem.  

The forty-seventh problem of Euclid's first book, which has been adopted as a symbol in the Master's Degree, is thus enunciated:  "In any right-angled triangle, the square which is described upon the side subtending the right angle is equal to the squares described on the sides which contain the right angle."  Thus, in a triangle whose perpendicular is three feet, the square of which is nine, and whose base is four feet, the square of which is sixteen, the hypotenuse, or subtending side, will be five feet, the square of which will be twenty-five, which is the sum of of nine and sixteen.  This interesting problem, on account of its great utility in making calculations and drawing plans for buildings, is sometimes called the Carpenter's Theorem. 

For the demonstration of this problem the world is indebted to Pythagoras, who, it is said, was so elated after making the discovery, that he made an offering of a hecatomb, or a sacrifice of a hundred oxen, to the gods.  The devotion to learning which this religious act indicated in the mind of the ancient philosopher has induced Freemasons to adopt the problem as a memento, instructing them to be lovers of the arts and sciences.

 

         

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