Barometer

Your barometer was designed to give the user accurate air pressure readings from sea level to an altitude of 7000 feet.  Before leaving the factory your barometer was calibrated to standard air pressure at sea level.  For your barometer to give you optimum results, you will have to recalibrate it to your local barometric pressure before use.

Locate your barometer in an area where it will remain undisturbed.  Do not position it in direct sunlight, as this could cause inaccurate readings.

You need to calibrate your barometer to your location.  This can be done by getting the pressure from a local radio or television station.  Use a small slotted screwdriver to turn the small screw on the back of the barometer case to adjust your barometer until the black pressure indicator hand points to a reading that corresponds to your known local barometric pressure.  Your barometer has now been calibrated.  For daily operation of your barometer, place the gold pointer attached to the lens directly over the black pressure indicator hand.

This will allow you to measure any change in pressure that may have taken place.  It is the amount of change in pressure and the rate of that change that will be an indicator of the weather.

 The following basic rules apply in using the barometer to predict weather conditions:

·         A fast rise in barometric pressure means good weather of short duration.

·         A rapid drop in barometric pressure means disturbances nearby - showers of short duration.

·         Regular elevation of barometric pressure usually will indicate clear, dry weather conditions (cold and dry in the winter)

·         A drop of 2-3 tenths of an inch per 24 hours indicates a depression some distance away.

·         Drops of 1-2 tenths per hour means disturbances near by, of short duration

·         Steep drops of 6-10 tenths within a 4-5 hour period indicates coming rain and a storm with strong winds.

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