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To assist in following the movement of the pointer, the Cape Cod
Marine Barometer has a
set-hand that is controlled by the small brass knob in the center of the glass dome. Turn the
knob so the gold set-hand aligns with the black pointer. The next time you check the
barometer, tap the glass gently to release any built-up tension in the movement. By then
comparing the position of the pointer to that of the set-hand, you will be able to determine
whether the pointer has risen or fallen and by how much.
Air pressure is designated by various units of measurement, the most common being "inches
of Mecury" ("Hg"). Barometric pressure typically ranges between 28 and 31 inches of
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Mercury. The outer scale on the face of the Cape Cod
Marine Barometer denotes inches of
Mercury. A second unit of measurement is "millibars," with a range of 950 to 1050 millibars
being typical under normal weather conditions. The inner scale around the face of the Cape
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Cod
Marine Barometer is in millibars.
The words "Foul," "Change," and "Fair" on the face of the dial provide a general guide only.
Usually, when the barometric pressure is low, the weather is wet, while high pressure usually
indicates dry weather. However, there are many exceptions to these generalizations. It is not
at all unusual for it to be raining when the barometer is high, particularly during the warmer
months when precipitation often is associated with thunderstorms and frontal passages,
rather than strong low pressure systems.
It is also quite common for the barometer to change very little for long periods of time.
Again, this is especially common during the warmer months when air pressure tends to be
very steady. The vast majority of the time, the barometer will read between 30.00" and
30.30." If you are concerned that your barometer has not changed for a long period of time,
you can easily check it by monitoring the readings for a few days and comparing them to the
readings given on your local weather forecast.
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Μarine Barometer requires no maintenance and should provide many years
The Cape Cod
of trouble-free operation. If servicing is ever needed, package the instrument carefully and
return it, with a note enclosed, to the manufacturer at the address below.
335 Lower County Road
Phone: 508-432-0970
P. O. Box 454
Toll-free: 877-438-2294
Harwich Port, MA 02646
Fax: 508-430-6020
Web site: www.capecodwindandweather.com
capecodwindandweather.com
E-mail: service@
- Keeping an eye on the weather since 1939! -
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