This is a very unusual working instrument by JP Friez of Maryland recording both barometric pressure as well as temperature and set out each side of the recording drum. Fully restored in a vibrant green & black metal case with glass viewing panel to the front & carry handle engraved with Julian P Friez and Sons. Internally, there is a label stating the makers name and ‘Belfort Observatory, Circa 1935. Baltimore USA’ 175mmH x 347mmW x 150mmD (Overall width including the external temperature sensor is 450mm).