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PREDICTOR
SETTING AND OPERATION
INTRODUCTION
Inside the brass barometer case is a sealed, flexible metallic drum. As the atmospheric pressures changes,
the drum is compressed or expanded. This change is transmitted through linkage to a pointer - thus, change
in atmospheric pressure is evidenced by movement of the pointer around the dial. The linkage has a
bimetallic element which automatically compensates for changes in temperature which would otherwise introduce
an error in barometer readings.
SETTING YOUR BAROMETER
Your barometer has been carefully calibrated and tested at the factory and
needs but one simple adjustment before installation at your location. This
adjustment is made by inserting a screw driver in the recessed slotted screw
at the back of the barometer and turning this screw to the proper setting.
The simplest method of obtaining the correct barometric pressure for your
location is to consult the local weather bureau, airport or perhaps a nearby
individual with a correctly set barometer.
Due to the nature of aneroid (mechanical) barometers it may be necessary
to fine tune the intial setting to accomodate the natural mechanical break-in
of the device by simply repeating the setting procedure.
SCREW
WOOD
PANEL
SCREW
SCREW
We recommend mounting the read-out on
one of our pre-drilled and centered panels.
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PREDICTOR
HELPFUL COMMENTS
Your barometer is a useful instrument for weather prediction. The settable
pointer, controlled by the knob in the center of the glass lens, is used to show
changes in atmospheric pressure. When reading your barometer, lightly tap
the case to take up normal slack in the linkage. Next, move the settable
pointer until it rests exactly over the movement pointer. The next time you
observe your barometer lightly tap the case again and you will now have
a clear indication of rising, falling, or steady barometric pressure. Observation
of changes in barometric pressure, wind and temperature conditions give the
weather watcher a strong basis for forcasting the weather.
WITH A RISING BAROMETER THE FOLLOWING READINGS INDICATE:
28.8 TO 29.2 INCHES
29.2 TO 29.6 INCHES
29.6 TO 29.9 INCHES
29.9 TO 30.2 INCHES
30.2 TO 30.5 INCHES
30.5 TO 30.8 INCHES
30.8 TO 31.0 INCHES
CLEARING, HIGH WINDS AND COOL WAVE
HIGH WINDS, COOL WAVE, PRECEDED BY SQUALLS
FAIR WEATHER, FRESH WINDS DURING NEXT 24 HOURS
FAIR WEATHER AND BRISK WINDS, DIMINISHING
FAIR WEATHER, COOLER VARIABLE WINDS
CONTINUED COOL, CLEAR WEATHER, LIGHT WINDS
HIGH WINDS, SOUTHEAST WITH RAIN
WITH A FALLING BAROMETER THE FOLLOWING READINGS INDICATE:
30.8 TO 30.5 INCHES
30.5 TO 30.2 INCHES
30.2 TO 29.9 INCHES
29.9 TO 29.6 INCHES
29.6 TO 29.3 INCHES
29.3 TO 29.0 INCHES
29.0 TO 28.7 INCHES
Excerpt from "Eldridge Tide & Pilot Book"
FAIR, WEATHER, FOLLOWED BY RAIN
APPROACHING STORM.
CLOUDY, WARMER, UNSETTLED WEATHER.
UNSETTLED WEATHER, WARMER WITH INCREASING WIND.
SQUALLY, CLEARING, FAIR AND COOLER WEATHER.
CLEARING, HIGH WINDS WITH SQUALLS AND COOLER WEATHER.
STORMY WEATHER
NOTE: IF THE BAROMETER IS TO BE USED ABOVE 3000 FOOT ELEVATIONS,
THEN THE UNIT MUST BE COURSE ADJUSTED AT THE FACTORY TO THE
PROPER AL TITUDE.
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Page 3
IMPORTANT ADDITIONAL INFORMATION
Components: Along with the indicator, the following components are included with this instrument:
Brass Case: Your brass case is solid brass A70-30 Holloware quality, with a durable lacquer
finish. It is in fact a piece of jewelry and should be treated as such. It should be cleaned at least
once a week to keep airborne pollutants (dust, etc…) and any moisture from collecting on the case
thereby attacking the lacquer. At no time should you use an abrasive cleaner or cloth on the brass
case. Simply use a soft cloth or soft paper towel with a mild glass cleaner to wipe the case clean.
If your instruments are in a summer home, and you are not able to clean them regularly, simply lay
a small cloth or towel across the top two -thirds so that dust cannot settle on the finish.
Specifications: All instrumentation or measuring devices have accuracy tolerances and
specifications. Making comparisons between different pieces of equipment is appropriate provided
the specified accuracies of both are known.
Measurement Range Guaranteed Accuracy
Barometric Pressure 28.5 – 31.5 Inches of Hg ±0.16 Inches of Hg
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