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1. A water barometer, weather barometer, storm barometer.
2. See below.
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The weather ball barometer is based on a simple design by Goethe. The glass globe is attached to a sturdy base with a funnel tube on one side. The ball is filled with colored distilled water. Once filled the air trapped inside the ball is no longer subject to variations in atmospheric pressure. The liquid in the indicator tube, however, remains open to the atmosphere and is directly affected by atmospheric pressure. When atmospheric pressure rises, the liquid in the indicator tube is pushed down and an improvement in the
1. Measure the barometric pressure at the top and at the bottom
Measure the barometric pressure (in mm of mercury) at the base of the building. Take the barometer to the roof of the building, and measure the pressure again. The difference tells you the weight of a column of air the same height as the building. Multiply the pressure difference (in mm of mercury) by the density of mercury compared to the density of air around the building. This gives you the height of the building (in mm). Use standard tables to convert to the required unit of measurement.
2. Drop the barometer and time how long it takes to fall
Take the barometer to the roof of the building. Walk to the edge. Drop the barometer over the edge and time how long it takes to hit the ground. You may either watch the barometer fall, or listen for it hitting the ground, depending on the height of the building and the accuracy required. Don't forget to correct for the speed of sound if listening for the crunch. Use the fact that height is gravity times the square of the time, divided by two to calculate height from the (known) gravity and the (measured) time.
3. Use the barometer as a measuring stick
Place the barometer upright against the wall. Mark the top of the barometer. Label the mark '1'. Move the barometer vertically so that the bottom of the barometer is at the mark. Mark the top of the barometer, labelling this mark '2'. Continue like this until you reach the top of the building. Multiply the number on the last mark by the height of the barometer. This will be accurate to within one barometer height. For greater accuracy, add one-half the height of the barometer to account for the portion above the last mark.
Note: For tall buildings, some extra equipment may be required to assist in climbing the wall.
4. Use the barometer as a pendulum
Buy a rope long enough to reach the top of the building. Tie the barometer to one end and go up on the roof. Lower the barometer until it is exactly one inch above the ground. Holding the top of the rope at the top of the building, swing the barometer, and measure the period of the pendulum. From this you can calculate the length of the rope. Add one inch and you have the height of the building.
5. Measure the shadow of the barometer and the building
On a sunny day, measure the length of the shadow cast by the barometer, and the length of the shadow cast by the building. Multiply this ratio by the height of the barometer to get the height of the building.
6. Compare the barometer height to the building height
Hold the barometer one foot in front of yourself and find a position where the building appears to be the same size as the barometer. Now measure the distance to the building (in feet) and multiply by the height of the barometer.
7. Trade the barometer for a long measuring tape
Go to a local shop and trade the barometer for the longest measuring tape they have. Take the tape onto the roof of the building. Holding one end, drop the other end over the edge of the building. Raise the measuring tape until the far end is just touching, not resting on, the ground. Read the height of the building from the measuring tape.
Note: For particularly tall buildings, this may require a particularly good hardware store.
8. Offer the barometer to the superintendent
Find the superintendent of the building. Offer him a deluxe display barometer if he will tell you the height of the building. If the superintendent is not available, or doesn't like barometers, try other parties such as the local survey officer, the original architect, or a member of the construction crew.
weather can be anticipated. When air pressure falls, the greater pressure inside the ball causes the liquid in the indicator tube to rise, indicating that a deterioration in weather can be expected.
There is something to be said for an oldie and a goodie, aside from the fact that I always love an oldie, one might say that they're always reliable and a solid constant. Don't know where we'd be without them sometimes.
As Mark Twain wrote in relation to April 1st, "This is the day upon which we are reminded of what we are on the other three hundred and sixty-four". :) Happy belated April Fool's Day to you as well, Colleen and a Happy Easter too!'
I liked the one about throwing the barometer off the top of the building and calculating its speed.
Niels Bohr is reputed to have also suggested throwing a barometer off the top of the building and timing its fall and swinging a barometer on a string as a pendulum first at street level then at the top of the building.
It would look great on the shelf sitting next to the Galileo Thermometer.
Carry device to top of building. Using a laser interferometer, measure its acceleration when dropped a few centimeters (or inches), and call that A1. Catch it carefully and take it back to the ground. Repeat the measurement, A2. Since A2 is closer to the center of the earth, it will be slightly greater than A1. The difference is nearly linearly related to the building's height, and can be calculated.
Trade the device to the building janitor/superintendent in exchange for the information about the height of the building. [This assumes he/she is intrigued enough by the device to give you the information.]
Another quiz in which google gave me the answer by just starting to type. All I did was trying to google "how to measure the height of a building" and the suggestions came up with "with a barometer". Thanks Google.
There is a company that sells this item with Galileo's Thermometer on a nice wooden base - a very stylish way to watch the weather!
Figuring out what the device was was simple; it probably would have been even without the markings on the bulb. Thinking up unusual ways to use the device to measure building height was kind of fun, though.
(My favorite) Take a photo of the building and the barometer together. Measure the height of the barometer in real life and in the picture. Use that ratio to convert the height of the building in the picture to get the actual height.