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In the following Figure you see four cannonballs, namely two with chains out of which fire burns in three places and which are used and fired on board ship and on water; [and] the other two, which are customarily fired on land into or out of a fort. With the above-mentioned cannonballs you can horrify and terrify the enemy mightily if they are assiduously prepared and the explosive shells are correctly inserted. Here I intend to report and reveal in a thorough, lucid account how they should be formed with the explosive material and the cross bands. Thus, gracious Reader,