By Illa Podendorf
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Young ones will study all approximately innovations: their inventors, the best way they replaced historical past, and their evolution over centuries, during the actions and anecdotes supplied during this interactive sequence. From historic civilization's earliest calendars and shadow clocks to the atomic clocks of this day, the historical past of time size emerges during this interactive advisor.
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Additional resources for 101 Science Experiments
These charges were negative. 10. How can a positive charge of electricity be made? Find four books each a b o u t a n inch thick. Place two books in one pile on a table and the other two about a foot away in another pile. Place a glass window pane from one pile of books to another. Cut some tissue paper dolls about one-inch tall. P u t the dolls u n d e r the glass. R u b the glass vigorously with a silk cloth. After a while the dolls will come u p a n d t o u c h the glass. T h e n they get the same c h a r g e as the glass (positive) a n d are repelled.
Put a teaspoonful of water in one dish, two teaspoonfuls of water in another dish, and three in the other. Place them side by side and let stand. Examine t h e m every two or three hours. Notice what happens. T h e dish with one teaspoonful of w a t e r b e c a m e e m p t y first, t h e n t h e one with two a n d then the one with three. 60 T h e water d i s a p p e a r e d a little at a time into the air. We call this evaporation. 2. From which of these dishes will water evaporate first? Find a saucer, a water glass a n d a footed test tube or narrow-necked bottle.
Be sure you connect a positive terminal and a negative one. This is important because electricity goes from the positive to the negative. The positive terminal is in the middle and the negative one is on the outside. Connect a wire to a switch and to one of the terminals of one of the dry cells. Connect a wire to the other terminal on the other dry cell. Connect a wire to the other end of the switch. Now you are ready to connect the bell. You will notice there are two screws on the bell. 46 Connect one of the loose wires to one screw and the other to the other screw.