Aneroid Barometer Instructions
Posted on January 3, 2019 | By clockde
Your barometer is an instrument for measuring atmospheric pressure or the weight of the air surrounding us. Variations in atmospheric pressure are usually an indication of a coming change in the weather. The barometric pressure generally indicates changes 12 to 24 hours in advance. therefore, we watch the barometer to anticipate and forecast, not as an indication of current conditions. Your barometer is an aneroid type. That is, it measures pressure mechanically, without the use of fluids, by means of an evacuated hollow metallic diaphragm. Change in atmospheric pressure on this diaphragm actuates the pointer or indicator hand on the dial. It is not necessary to mount your barometer outdoors since it will operate properly inside. The barometer scale is graduated in inches, millibars, and centimeters as a measurement of atmospheric pressure. At sea level, normal atmospheric pressure is approximately 29.92 inches, 1014 millibars, and 76 centimeters. The average variation in pressure normally encountered at any given altitude is approximately 1" to 1 1/2" either way from the average. Frequently, for many days at a time, the variation and attendant movement of the black indicator is confined to a very limited area. The gold plated hand on the glass is a marker hand to be set over the indicator hand when a reading is taken. This marks the pressure at the time of the reading so that subsequent change may be readily noted. A gentle tapping on the glass with index finger will cause the indicator hand to move for a more precise reading. When you see the pressure dropping, it is an indication that the weather is to become stormy. If you see the pressure rise, it is an indication of good weather ahead. Expect your barometer to read between 29 Mb and 30Mb most of the time. The scale is much wider than will probably ever be displayed. For example the lowest pressure ever recorded in the US was just under 29mB. Small changes indicate large weather variances. The printed weather conditions on the dial are spaced apart so the dial will appear balanced.
PRESERVING THE LUSTRE OF YOUR CLOCK AND BAROMETER CASE
Your clock case is constructed with a very high-quality brass, then plated and lacquered for appearance and protection.
Chemicals contained in ordinary fingerprints or dust are harmful to the finish.
DO NOT apply polish, cleaner or other liquid to the clock case as this will result in pitting and tarnishing.
To remove harmful chemicals from the surface, we recommend you wipe your case with a soft cloth weekly. Treated with
care, the lacquer seal will not be broken and your clock will retain its bright appearance.