A very exact procedure will be used to teach the keyboard by 
touch.  

               First, the letter will light.  
               Second, the letter will be dictated. 
               Third, you will hear a tone.  

When you hear the tone, strike the key.  Do not strike the key
when you see the letter "light" nor when you hear the letter
called.  Wait until you hear the tone.  Without keying observe
the procedure you will follow.