A scarce early Series 2 aneroid barometer by Bourdon & Richard No 2728 c1855

Bourdon barometer having 4¾” open centre printed card dial, the outer part marked with standard meteorological terms, the lower annotated “Metallic Barometer” with twin medallions for Gold Medal Exhibition 1849, cited as “E. Bourdon & Richard’s Patent, Paris,” and Universal Exhibition London 1851, cited as a “Council Award.” The inner barometric scale calibrated in inches of mercury with a range from 28 – 31 divided to 1/20ths”. Domed glass with trademark Bourdon pierced gilt index.

Early pattern movement, the beam chassis struck with “EB” logogram, marking Felix Richard’s production for Eugene Bourdon, serial no. “2728,” and “Richard a Paris,” the tube mounting bracket struck “2 Serie, Bourdon & Richard, 2728”, and “Brevetes A Paris.” All contained within a standard drum form case, bayonet fitting front bezel and back cover, the verso centre with shuttered calibration. Pendant and suspension ring.

Condition: The subject of a full service, conservation, and calibration under laboratory conditions, see performance chart from dynamic test. The movement working exceptionally well.

The card dial with signs of ageing, some marking, the glass remaining in very good condition with just a few very light marks. The brass case retaining much of its original lacquered finish.

Comments: These instruments, perhaps the most collected of the aneroid series of barometers, are now very hard to find, and this is a particularly early and therefore scarce example.