Description

A six inch gunner’s caliper with finely engraved with scales for ‘Quantity of Powder for Filling the Chambers of Brass Mortars & Howitzers’ and marked out in inches for ‘Sea’ and ‘Land’ on one side, and for ‘Brass Guns’ over ‘Proof Service’ and ‘Iron Guns’ over ‘Proof Service’ on the other, hinged from ‘0’ to ‘180’ degrees and from ‘0’ to 8 Inches’, one side with 12 ‘Inches’ rule, and with steel tips, 30.5 cm (extended).