Fig. 100: Instrument to find the center of a mortar's mouth.
Fig. 101: Stone scale.
Fig. 102: Metal ring to measure caliber.
Brawe, Hermann. “Plate 45: Tools and Instruments Used with Mortars.” 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/wd375w296.
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