The variator is actually the brain of your computer. That is where ALL the calculating is done.
The range arms transfer the action of the cone gear to the cluster on top.
All three gearing systems; 10 cent, 1 cent 9/10 cent, take their info from the cone and simultaniously rotate the cluster.
All three calculations converge at the top gear.....it is an amazing setup that has NEVER been improved on since 1932 because it has never needed it.
Mechanical computers still use the same setup but w/ 4 range arms ...a 4th to accomidate the "dollar" mode.
This is WHAT & HOW you get w/ 4 revolutions of the cone gear., at a 42 9/10 setting