Weems and Plath WBJ10121 Installation & Assembly
BAROMETER
Lifetime Warranty
214 EASTERN AVE. • ANNAPOLIS, MD 21403 • USA
410-263-6700 • fax 410-268-8713
E-mail: support@weems-plath.com
www.weems-plath.com
08/2018
OPERATING INSTRUCTIONS
A barometer is an instrument used to predict a change in weather
by measuring variations in atmospheric pressure or the weight of the
air around us. e barometer will normally indicate changes in weather
12 to 24 hours in advance; it is not an indicator of present weather
conditions. Barometric pressure is the same indoors as outdoors.
Your barometer is an aneroid type which measures atmospheric
pressure mechanically without use of liquids. An evacuated hollow
metallic diaphragm is employed to actuate a pointer indicating
atmospheric pressure.
Do not take any notice of the words Rain, Change, Fair. ey are
a traditional graphic decoration found on all barometers. At sea level,
the normal atmospheric pressure is about 30 inches. Very rarely will the
needle ever exceed 30.5 or drop below 29.5. Sometimes it is possible
for the pressure to change only one or two tenths of one inch over a
week, even a storm may cause only a half inch of change.
When your barometer left the factory, it was set at standard
sea level which is the standard setting for weather observation.
e movements used in Weems & Plath® barometers are adjustable
up to an altitude of 3,500 feet. e pressure will decrease as your
altitude increases. It is necessary for you to adjust your barometer
to the atmospheric pressure in your geographic area by means of
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