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Precision aneroid barometers are used for measuring the absolute atmospheric
pressure. Because of the excellent instrument properties an aneroid barometer
is indispensable for meteorology, ocean navigation, industry, and research.
Fischer Precision Aneroid Barometer CODE 103
This is the most popular model for larger yachts and ships, and for land based weather bureaus, with many in use in the UK Met Offices and other European weather services, as well as by individual weather watchers, worldwide.
What colours and materials does it come in?
The optional choice of polished brass or flat chrome movements (see Pilot) is purely aesthetic; each has the same high accuracy and reading precision.
Why buy a Mechanical [aneroid] barometer?
Mechanical (aneroid) barometers have been used on land and sea continuously since the mid 1800s. By the 1960s, precision aneroid barometers were fully developed and available from selected dealers. Navies and weather-service vessels worldwide rely on these aneroid instruments daily. Mariners have historically cared only about pressure trends (up or down, fast or slow). These are important observations (if made accurately), but the actual values of the pressure can be even more important in many modern applications. Specific pressure values are the best way to monitor the timing of a forecasted weather system, as well as to evaluate the forecast in general. Target pressures are the key to tactical weather routing, and this can only be done with accurate pressure observations.
Technical Information
The self-stablized set of five aneroid capsules used in our precision
aneroid barometers is made of a corrosion proof copper-beryllium-alloy. This
alloy has been well established for measuring the atmospheric pressure for many
years because of its remarkable elastic properties. The aneroid capsules are
nearly free of age-hardening, hysteresis and elastic after-effects.
The influence of temperature on the set of aneroid capsules and the
transmission system is compensated by a bimetal arm over the whole measuring
range and for temperatures between -30 to +40 °C (-22 to 104 °F). The motion of
the aneroid capsule is transmitted to the axle of the pointer by driving a
segment and wheel with an excellent fine finish gearing. All bearings also have
an excellent fine finish. The Instruments have only a bare minimum of idle
friction because of the advantageous shape of the levers and bearings.
To most experts, this is one of the highest quality aneroid barometers in
the world. It has been tested at sea for over 70 years, and used by Navies and
Weather Services around the world. The double needle design removes parallax
error in reading.
To access the set screw: The bottom of the instrument has a large plug. Use a wide screwdriver to remove
this plug to reveal the small screw that sets the instrument as needed. You
will find it has a very smooth, positive motion, so you can easily set the
instrument to within a fraction of a mb, which is quite the contrary to what is
observed in lesser instruments.
The new dials showing both millibars (mb) and inches of mercury have been
custom made for American and British users on land and sea. The mb (same as
hectoPascals) dial is the international standard for maritime applications.
A certificate of accuracy is provided with each instrument. Each has a unique serial number
on a metal plate on the top of the instrument.
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