Note 226 — Chapter X

Critobulus, xxix., gives the description of the construction of a cannon the barrel of which was forty spans or twenty-six feet eight inches long. The bronze of which it was cast was eight inches in thickness in the barrel. Throughout half the length its bore was of a diameter of thirty inches. Throughout the other half, which contained powder, the bore was only one third of that width. The σπιθαμὴ or palmus or span was in the Middle Ages, says Du Cange, eight inches long. Two stone balls still existing at Top-Hana (that is, the Cannon Khan) are forty-six inches in diameter. These would answer the description of Tetaldi, that the ball reached to his waist. A great Turkish cannon which is now in the Artillery Museum at Woolwich weighs about nineteen tons. It was cast fifteen years after the siege of Constantinople and is an excellent specimen of the great cannon of the period (Artillery; its Progress and Present Stage, by Commander Lloyd and A. G. Hadcock, R.E., p. 19).