WHAT IS COLOR? 



161 



Cover one end halfway across, 



-IBS. 



at the 5 and 10). Cut holes near the ends of mailing tube but 

 on opposite sides. Fasten the mirrors back of these openings 

 facing and parallel to each other but at angles of 45 to the 

 long axis of the tube. Then objects in front of the top opening 

 can be seen by looking into the lower opening. 



4. A HOME-MADE KALEIDOSCOPE 



Fasten two strips of mirrors about 2" X 1" or 8" together with 

 the mirror fronts facing each other at an angle of 45. A tin frame 

 can be bent so it will hold there, 

 leaving a peep hole where the 

 two glasses meet. Cover the 

 wide open space two inches from 

 the end. Support this vertically 

 with the peep hole at the top 

 above a block of wood, leaving a 

 space under it where a disc can 

 be placed so it can be revolved 

 under the two mirrors. By plac- 

 ing colored chips of glass and 

 other objects upon the disc, 

 different patterns and designs 

 may readily be produced. 



5. MAKE A SCRAPBOOK ON LIGHT 



Collect pictures and clippings from newspapers and magazines. 

 Group the clippings according to subject matter. 



mirrors v 



'revolving 

 ^ 



SCIENCE CLUB ACTIVITIES 



1. TEST FOR COLOR BLINDNESS 



Buy or borrow a set of Holmgren's woolens for testing color 

 blindness. Test the eyes of each member of the club. 



2. MAKING A PICTURE 



Get some one who knows how to demonstrate the use of a camera 

 with a ground-glass back, also how to print and finish a picture 

 from a negative. 



3. BURNING A CANDLE IN A JAR OF WATER 



Arrange your apparatus as in the diagram on page 162. The 

 plate glass should be 15 to 24 inches by 3 to 4 feet. Double- 

 thickness glass may be substituted. The jar of water is seen by 

 transmitted light, and the candle by reflected light. Have the 

 H. & w. sci. i 12 



