British naval barometer

barometer

British Naval barometer (a), with dolphin gimbal bracket (b); 1914 issue, vessel I.D. on brass plate; "NEGRETTI & ZAMBRA/ LONDON" and "MG2259/ 40/ 42 / STANDARD/ TEMPERATURE/ at 1000 Mb./ 284.2a No 47"; steel stem with brass and stainless steel cistern cover; stainless steel fittings and markings, engraved calibrations, brass guide for vernier; regular issue and used by Royal Navy during WW I.