"The apron is the most important article in the Masonic wardrobe," wrote Bro. Harry Flint, Past Provincial Grand Junior Deacon, in an article entitled "Masonic Clothing," in Volume IX. of the Transactions of the Manchester Association for Masonic Research.
In this I fully concur, as I consider the apron one of the ten landmarks of speculative Freemasonry.
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1940 - The Masonic Apron - Bro. Harold V. B. Voorhis