HOLOSTERIC BAROMETER – R. MERRILL’S SONS NEW YORK – HPBN – V. Merrill & Sons, New York, (established 1869) and manufactured by HPBN (Naudet Pertuis Hulot Barometers), Paris. It appears to be in good working order, with some toning to the outer part of the silvered dial, and a deep, un-touched [...]