Copyright © 2019 Jason Clarke Antiques.
Edwardian Cased Pocket Damp Protector or Hygrometer by Aitchison & Co of London & Leeds
Edwardian Pocket Barometer & Altimeter with Original Case by Newton & Co, Fleet St, London
Rare Cased Pocket Aneroid Barograph Altimeter by Richard Freres of Paris
Very Early Cased Pocket Barometer by Smith Beck & Beck of London