18. Surveyor's Quadrant

Signed: Iacobus Lusuerg Mutinensis Faciebat Romae Ao 1677

  Fig. 11

If Erasmus Habermel's combined quadrant, sight and gauge was devoted to the ostentatious demonstration of aids to gunnery, this quadrant by Lusverg is a model of discreet restraint in comparison. Nevertheless its prospects for active military service were probably no higher.

The upper face of Lusverg's instrument is marked out for a surveyor, with folding sights and a sinical quadrant. However, in the otherwise blank space alongside the ball and socket joint on the under side, there is a circular scale of points marked 'Pro Eleuatione Bombardae'. To measure the elevation of an artillery piece, a plumb bob and line are attached through a hole pierced directly through the plate of the instrument. To forestall any uncertainty, an engraved diagram gives visual instruction on how to use the instrument at the mouth of a gun.

Radius: 157 mm

Inventory no. 48,133


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