>                                                                
>                                                               
>                A    
>                + +-Ammeter    
>         Cell                                 Coil    
>                -         Variable Resistor             
>                /:/:/:/                 
>                   
>                   
>                                                                
>                                                             
>                     
>        TM              
>           
>                                                                
>                                                                
>                                       Y = 7/4 Sin X           
>                          3                                
>                         2                              
>                    1                       
> ##---                          Pi     2Pi      3Pi
>          0 
>:    <                                       
>            -1              Amplitude= 1.75
> :    +                                  Period = 2 Pi
> !               -2                                
>                                                              
>                                                                
>                                         
>      4                                
>     3         
>     2        
>      1             
>Ja    Fe   Ma   Ap   Ma             1980     1981     1982      
>                                                                
>                         
>                                                    
>                    
>       10 Copper Pieces = 1 Silver Piece               
>    20 Silver Pieces = 1 Gold Piece                
>        2 Gold Pieces = 1 Electrum Piece       
>           1 Electrum Piece = 5 Bronze Pieces  
>        
>                                           
>                             
>                  
>                          
>                                      
>                                        
>                                          
>                                                             
>                                                        
>                              
>       
>                             
>             
>        
>  
>                                                 
>                             
