CHAPTER XXV 



OUTDOOR RECREATION 



Problems. i . To learn what games can be played 

 in the home yard. 



2. To find out what science principles underlie our com- 

 mon games and toys. 



3. To see how a lens makes objects appear larger. 



4. To understand how pictures are taken. 



5. To learn the relation of our earth to other heavenly 

 bodies. 



Experiments. i. Demonstrate gyroscopic motion with toy gyroscopic 

 tops. 



2. To show centrifugal force. 



3. To show the processes of printing, developing, and fixing a picture. 



Project I. To PLAN FOR UTILIZING THE PLAYGROUND OF THE 

 HOME LOT. 



1. Determine what space is needed for games which interest 

 you. 



2. Which games require permanent location because of the 

 fixtures, and which allow the ground to be used for other games 

 at times? 



3. What will be the cost of the games? What ones can you 

 make or arrange by yourself? 



Suggested Projects. 



1. MAKE A PINHOLE CAMERA AND TAKE PICTURES WITH IT. 



2. TAKING AND MAKING PICTURES. 



390 



