Water Barometers
Today, atmospheric pressure is usually measured in inches of mercury or other standard, on a modern barometer - either digital or analog. The water barometer is from Galileo's time, and indicates barometric pressure changes with varying levels of water in the tube or spout.
The air trapped in the bottle by the water maintains a steady pressure. This is an old concept, and not "precise", but still usable today.
This information applies to many, but not necessarily all models and makes of water barometers, and is provided for informational purposes. Use at your own risk.
How Water Barometers work: When high pressure and good weather are approaching the region, the liquid is pushed down the spout. When low pressure and bad weather are coming, the greater pressure trapped inside the bottle causes the liquid in the spout to rise.
Initial barometer setup: Fill a basin or container with six inches of cold water. Fill another basin to the same depth with water as hot as you can endure putting your hands in. Immerse the whole barometer in the hot water. When the bubbles quit coming out of the spout, place your finger over the spout end and remove the barometer to the cold water. Release the spout top and water will be drawn into the spout.
Repeat these steps until the water level in the barometer is 1/2 inch above the highest point at which the spout meets the bottle. Allow an hour for the water to attain room temperature, then turn the barometer upside down, allowing half the liquid in the spout to pour out. Then color the water with your choice of liquid food coloring.
Thermometer adjustment:
The thermometer has been adjusted in the factory. If you wish to check the thermometer, place it next to a well-calibrated thermometer. If it needs correction, adjust it carefully with a small screwdriver using the hole in the back of the case at the thermometer needle base.
Hygrometer adjustment:
The hygrometer indicates the atmospheric humidity in %. For the device to work reliably we recommend that it be recalibrated at least every year. To do this, wrap the instrument in a moist piece of cloth for 30 minutes. The hygrometer should then indicate 94-96%. To adjust the calibration, carefully turn the screw in the back of the case behind the hygrometer with a small screwdriver.
Visit us online at: http://bellclocks.com
a Division of Windward Instruments
The air trapped in the bottle by the water maintains a steady pressure. This is an old concept, and not "precise", but still usable today.
This information applies to many, but not necessarily all models and makes of water barometers, and is provided for informational purposes. Use at your own risk.
How Water Barometers work: When high pressure and good weather are approaching the region, the liquid is pushed down the spout. When low pressure and bad weather are coming, the greater pressure trapped inside the bottle causes the liquid in the spout to rise.
Initial barometer setup: Fill a basin or container with six inches of cold water. Fill another basin to the same depth with water as hot as you can endure putting your hands in. Immerse the whole barometer in the hot water. When the bubbles quit coming out of the spout, place your finger over the spout end and remove the barometer to the cold water. Release the spout top and water will be drawn into the spout.
Repeat these steps until the water level in the barometer is 1/2 inch above the highest point at which the spout meets the bottle. Allow an hour for the water to attain room temperature, then turn the barometer upside down, allowing half the liquid in the spout to pour out. Then color the water with your choice of liquid food coloring.
Thermometer adjustment:
The thermometer has been adjusted in the factory. If you wish to check the thermometer, place it next to a well-calibrated thermometer. If it needs correction, adjust it carefully with a small screwdriver using the hole in the back of the case at the thermometer needle base.
Hygrometer adjustment:
The hygrometer indicates the atmospheric humidity in %. For the device to work reliably we recommend that it be recalibrated at least every year. To do this, wrap the instrument in a moist piece of cloth for 30 minutes. The hygrometer should then indicate 94-96%. To adjust the calibration, carefully turn the screw in the back of the case behind the hygrometer with a small screwdriver.
Visit us online at: http://bellclocks.com
a Division of Windward Instruments
posted by bellclocks.com @ 8:14 AM
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