Brawe, Hermann. “Plate 46: Finding the Center of a Mortar's Mouth.” In Vollenkommene Unterweisung, Wie Raketen, Feuer- Wasser- Sturm-Kugeln, Granaten, Pech-Sturm-Kräntze, Und Allerhand Lust Und Ernsthaffte Feuer-Wercke Zubereiten. Osnabrück, Germany: Schwänder Johann Georg, 1660. https://digital.sciencehistory.org/works/qz20ss491.
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