World wide magnetic variation computer

Claim 1

A STORAGE APPARATUS FOR GENERATING AN OUTPUT SIGNAL PREDETERMINEDLY RESPONSIVE TO A PLURALITY OF DEPENDENT VARIABLES, COMPRISING A THREE-DIMENSIONAL CAM HAVING A PREDETERMINED SURFACE CONFIGURATION; SAID CAM BEING ROTATABLE ABOUT ITS LONGITUDINAL AXIS RESPONSIVE TO A FIRST DEPENDENT VARIABLE; A CAM FOLLOWER POSITIONABLE ALONG THE LENGTH OF SAID CAM RESPONSIVE TO A SECOND DEPENDENT VARIABLE, WHEREBY THE LOCATION OF SAID CAM FOLLOWER ON SAID CAM SURFACE IS COMBINEDLY RELATED TO SAID FIRST AND SECOND DEPENDENT VARIABLES TO PROVIDE A CAM FOLLOWER SIGNAL; A SCALE FACTOR GENERATOR; MEANS FOR ACTUATING SAID SCALE FACTOR GENERATOR RESPONSIVE TO AT LEAST ONE OF SAID DEPENDENT VARIABLES, SAID SCALE FACTOR GENERATOR INCLUDING MEANS FOR GENERATING A SCALE FACTOR SIGNAL PREDETERMINEDLY RELATED TO AT LEAST SAID ONE DEPENDENT VARIABLE SIMULTANEOUSLY WITH SAID CAM FOLLOWER SIGNAL AND OPERATIVELY DEPENDENT ON THE CAM FOLLOWER LOCATION; SAID CAM FOLLOWER SIGNAL AND SCALE FACTOR SIGNAL BEING COMBINEDLY PRESENTED TO MEANS FOR GENERATING SAID OUTPUT SIGNAL WHEREBY SAID OUTPUT SIGNAL IS RESPONSIVE TO BOTH SAID CAM FOLLOWER LOCATION AND SCALE FACTOR SIGNAL; SAID CAM SURFACE HAVING A FIRST REGION IN WHICH THE GRADIENT OF CAM SURFACE CHANGE SUBSTANTIALLY CORRESPONDS TO THE GRADIENT OF SAID OUTPUT SIGNAL, AND A SECOND REGION WHEREBY THE GRADIENT OF CAM SURFACE CHANGE IS APPRECIABLY LESS THAN THE GRADIENT OF SAID OUTPUT SIGNAL, SAID SCALE FACTOR SIGNAL HAVING A GREATER VALUE AT SAID SECOND REGION, THEREBY REDUCING THE REQUIRED CAM SURFACE GRADIENT FOR THE DESIRED OUTPUT SIGNAL GRADIENT.