Chapter: SCIENCE EXPERIMENTS & AMUSEMENTS FOR CHILDREN BY CHARLES VIVIAN. Simple Technical Steped Practical Projects for school and college students.

All Colors Produce White

You will need: Card, pencil, scissors, water-color paints, brush, string or thread, compass. SCIENCE EXPERIMENTS & AMUSEMENTS FOR CHILDREN BY CHARLES VIVIAN. Simple Technical Steped Practical Projects for school and college students.

You will need: Card, pencil, scissors, water-color paints, brush, string or thread, compass.

The first man to discover that ordinary white daylight was really a combination of bright colors was Sir Isaac Newton, a modest, scientific genius born in 1642. It was while he was experimenting with telescopes that he first noticed the colors of the spectrum-the same colors which we see in a rainbow.

He discovered that a ray of light entering his darkened laboratory, when reflected through a prism, was split up into these colors and therefore rightly thought that they produced white light.

There is a simple experiment which will enable us to test this for ourselves.

Set your compass at 1.5-inch radius and draw a circle on a piece of cardboard. Keep the compass at the same measurement and use it to mark off six equal divisions around the circle. Draw straight lines from these points at the outside directly to the center of the circle, as in Fig. 1.

Paint the various sections of the cardboard disc the colors marked. Ordinary watercolors from your paint box will serve quite well for this.

Allow time for the paint to dry and then make two small holes near the center of the disc, about 0.5-inch apart (see

X and Y).

Now pass a piece of thread about 3.5-feet in length through the two holes in the middle of the disc (Fig. 3), and tie the two ends together.

Hold the string by the loops at each end and get a friend to slide the cardboard disc along until it is midway between your hands. Now twirl the disc around until the string is tightly twisted and pull gently on the loops. You will soon find it quite easy to keep the disc spinning at high speed.

Once the card is spinning around really fast you will find that the bright colors you have painted on it merge together to produce white.

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SCIENCE EXPERIMENTS & AMUSEMENTS FOR CHILDREN BY CHARLES VIVIAN. Simple Technical Steped Practical Projects for school and college students. : All Colors Produce White |