Early 18th century

  Fig. 31

The long leg of this instrument enables it to be placed in the barrel of a gun to read elevations against a scale of degrees from 45-0-45. The rigid plummet is intended to give quicker readings than were possible with a plumb bob and line, which were liable to continue swinging for longer. The instrument also serves as a gunner's gauge, carrying scales for stone, iron and lead on one side, and scales for Vienna and Nuremberg inches and for powder on the reverse.

Length: 296 mm

Inventory no. 44,994