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Click here to subscribeA nickel plated aneroid pocket barometer with altimeter scale in hunter watch form case Unsigned, late 19th century The 1.5 inch circular silvered register calibrated in inches within fixed altimeter scale within rotating knurled bezel with setting pointer, the case with hinged cover and suspension loop, 5cm diameter, B.C. Ref. 201. Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 32.
A gilt brass aneroid pocket barometer with stem adjusting altimeter scale Unsigned, late 19th century The 1.75 inch circular silvered register calibrated in inches, with rotating altimeter scale calibrated to 10,000 feet within knurled bezel to circumference adjusted via knurled crown within the suspension loop, in watch form case, 5cm diameter, in original leather case, B.C. Ref. 208. Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 58.
A nickel finish aneroid pocket/travelling barometer Unsigned, late 19th century The 2.5 inch circular enamel register calibrated in inches, in watch form case with suspension loop, 7cm diameter, in original hinged open fronted leather-covered easel case with hinged strut to rear, B.C. Ref. 218. Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 58.
A gilt brass aneroid pocket barometer with altimeter scale, thermometer and compass Unsigned, late 19th century The 1.75 inch circular silvered register calibrated in inches and with curved mercury Celsius thermometer to centre and rotating altimeter scale calibrated to 20,000 feet within knurled bezel to circumference, in a watch form case with small mother of pearl compass with locking lever to verso and suspension loop, 5cm diameter, B.C. Ref. 224. Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 60.
A brass aneroid pocket barometer with altitude scale John Wardale & Co, London, dated 1918. The 2.5 inch circular silvered register calibrated in inches and inscribed JOHN WARDALE & CO, LONDON, NO. 633, 1918, with rotating altimeter scale calibrated to 10,000 feet within knurled bezel to circumference, in pocket watch form case with suspension loop, 7cm diameter, B.C. Ref. 239. Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 77. John Wardale & Co are recorded by Banfield as working in London from circa 1890.
A pocket travelling compendium of aneroid barometer with altimeter scale, mercury thermometer and compass Unsigned, late 19th century The barometer with 1.5 inch circular silvered register calibrated in inches and with altimeter scale calibrated to 10,000 feet within rotating bezel with steel pointer, in gilt brass watch form case with suspension loop, 4cm diameter, in original pear shaped velvet lined leather-covered carrying case set with an ivory Fahrenheit and Centigrade scale mercury thermometer opposing a small gilt metal cased watch form compass to the interior of the two front flaps, 7.5cm wide overall closed, B.C. Ref. 241. Illustrated in Banfield, Edwin BAROMETERS, Aneroid and Barographs page 78.
A brass aneroid pocket weather foreteller or Weather Watch Negretti & Zambra, London, early 20th century The 2 inch circular silvered register calibrated in inches to the circumference around inner ring adjustable for direction of wind via the knurled bezel and central disc rotating via crown within suspension loop for lining up with the blued steel pointer and pierced with three sectors annotated FALL, STEADY & RISE and inscribed PATENT 6276/15R/137, NEGRETTI & ZAMBRA, the cylindrical case with altimeter scale and pointer for adjustment by turning the rear bezel to align a pointer engraved into the rim, the rear cover is annotated with 26 sectors describing a weather forecast beside a letter of the alphabet which appear within the relevant sector to the centre of the register, 5.4cm diameter, B.C. Ref. 247. This pocket barometer incorporates Negretti & Zambras Weather Forecaster patented in 1915 which was developed using actual weather conditions over a ten year period. By setting the wind direction and lining up the central disc against the steel pointer on the dial, as well as setting the correction for altitude (by rotating the rear cover so that the arrow lines up with the correct level on the scale engraved on the side of the case), the weather can be forecast by reading the letter that appears within the appropriate sector in the centre of the dial taking into account whether the pressure has been rising, falling or remaining steady and the season (summer or winter). Illustrated in Banfield, Edwin BAROMETERS Aneroid and Barographs page 87, with a full description of its operation on page 89.
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