How to make a Hygrometer?

When you're planning a picnic with your friends, you need to know that the weather will be fine so that you can enjoy yourselves.
Many people need to know what the weather will be like so that they can plan their work or other outdoor activities.
Scientists who study the weather are called meteorologists.
They use many different instruments to collect information about temperature, air pressure, wind speed and direction. They also study the amount of moisture in the air.
Meteorologists measure the speed of the wind with an anemometer, and the amount of moisture with a hygrometer.
These instruments are used in weather stations on the ground, or in aircraft, ships and weather balloons. Meteorologists use the information from these instruments to forecast what the weather is going to be like.

You will need:

a pencil a ruler
a piece of thin card board,
6 inches x 1.5 inches
(15 centimeters x 4 centimeters)
a piece of stiff cardboard,
8.5 inches x 11 inches
(21 centimeters x 27.5 centimeters)
a pair of scissors
tape
a strand of hair, about
8 inches (20 centimeters) long
apiece of wood,
11 inches x 2 inches x 2 inches
(27.5 centimeters x 5 centimeters x 5 centimeters)
six thumb tacks
a colored pen with a fine point

You can make your own hygrometer.
Keep a chart of your results every day for three weeks.
Can you forecast whether it will be wet or dry during the fourth week?
1. Using the ruler, draw an arrow about 5 inches by 1 inch (12.5 centimeters x 2.5 centimeters) on the thin cardboard. Cut out the arrow.

2. Tape one end of the strand of hair to the center-top of the stiff cardboard.

3. Using thumb tacks, attach the stiff cardboard to the long edge of the piece of wood.

4. Attach the free end of the hair to the middle of the back of the arrow.

5. Place the arrow against the cardboard and move it until the hair is stretched out fully and also parallel to the long side of the cardboard. Then attach the end of the arrow (opposite the arrowhead) to the cardboard with a thumb tack.
6. Stand the hygrometer outside. Make sure that it can't fall over. When the sun is shining, mark on the cardboard where the arrow is pointing. Write "dry" by the side of this mark. When the weather is damp, the arrow will point lower. Mark its new position and write "damp" on the cardboard.

How does your hygrometer work?

On a damp day, the strand of hair will absorb moisture from the air. This will make the hair stretch and so the arrow points lower. On dry, sunny days the hair dries out and becomes shorter.

Folding step stool woodworking plan - Step by Step Guide

A Step-Ladder Stool is of just the right height for general household use, for washing woodwork, or for reaching upper shelves in the pantry. It also makes an excellent kitchen stool, the lower step serving the purpose of a foot-rest. When the ladder-stool is not in use, it may be folded into the compact form shown in Fig. 119, and stood behind a door or in some other out of the way place. The Ladder consists of three portions, the steps (Fig. 120), the rear legs (Fig. 125), and the seat or top step (Fig. 128). The Side Rails of the steps (A, Fig. 120) should be cut of the dimensions shown in Fig. 121. Mark the ends to be cut to the angle shown, the top to be notched to receive an end of the crosspiece D (Fig. 120). The diagram shows the positions for steps B and C. The steps must pitch at the same angle as the rail ends. Groove the side pieces to a depth of 3/8 inch, to receive the ends of the steps (Fig. 123). You will see by Fig. 120 that the sides of the grooves must ...

Morse Code for Kids and Morse Code Alphabet

In 1832, an American artist sailed home from Europe. He had spent some time painting in Europe and hoped to sell his pictures when he arrived home. His name was Samuel Morse. The journey on the ship was to change Samuel Morse’s life. Read more: How to make a morse code machine... He met a young chemist from Boston, named Charles Jackson, who showed him how an electromagnet works. Morse became interested in electricity and in the idea of sending messages along electric wires. Samuel Morse was one of the first people to make an electric telegraph. An electric telegraph uses an electric current to send messages along a wire. - - - - - - - - - Read more about: Why do wisdom teeth cause so many problems? - - - - - - - - - Operators of this electric telegraph machine sent messages down the line in Morse Code. Morse Code Alphabet This telegraph was not what made Morse famous. He gave his name to the code of dots and dashes which he invente...

Moro carrot soup - Natural Remedy for Diarrhea - Professor Ernst Moro Carrot Soup

In the early XXth century diarrhea was the cause of death for many babies in Germany and in the whole world. Professor Ernst Moro (1874 - 1951) the head of the children's hospital in Heidelberg at that time, found out by experiment that a simple carrot soup decreased the death rate of babies suffering from diarrhea by nearly 50%. Ernst Moro in 1904 A German study published in 2002[1] outlines that acidic oligosaccharides formed in aqueous extracts from carrots (carrot soup) may lead to less adherence of bacterial agents to the mucosal wall of the bowel, thus being a more effective treatment for acute gastrointestinal infections of children than glucose-electrolyte-solution oral rehydration. In 2009, experiments showed that Professor Moro's Carrot Soup can cure diarrhea caused by bacteria that are resistant to antibiotics.[2] Even today the diarrhea is one of the main causes of death among children in developing countries. Many lives can be saved by using this simple recipe...

Ency123

Search This Blog