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I.117 Gunner's quadrant
Maker: unknown
Date:17th cent.
Materials:brass
Dimensions:max. length 420 mm
Current inventory:1303
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This gunner's quadrant is composed of two flat legs of uneven length, joined at a right angle. A graduated arc enabled made it possible—presumably with the use of a plumb bob tied in the corner—to measure scarp-wall gradients and gun elevations. The model from which this example derives is described by Niccolò Tartaglia in Nova scientia (Venice, 1537). Provenance: Vincenzo Viviani bequest.

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