I agree with Martin that in the late sixties, possibly for a lame attempt to validate their BS claims of increased load capacity, GE switched Activators from the ramps to what we call the Straight 6; they may have made the washing action in the mini-baskets more effective but IMO they were less effective at creating rollover for the main wash loads. There is debate on this site about this but for me there is no argument if you have a pair of eyes and a stopwatch. GE switched back to the ramped-design in the Eighties when the Dual Action Agitator was introduced and totally shamed them on the rollover issue.
Here are two good explanations from GE designers at the time:
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<span style="font-size: 10.5pt; font-family: 'Helvetica','sans-serif'; mso-fareast-font-family: 'Times New Roman'; color: #444444;">ACTIVATOR’S spiral blades provide uniform soil removal by exposing clothes to the vigorous washing zone of the activator’s lower area.</span>
<span style="font-size: 10.5pt; font-family: 'Helvetica','sans-serif'; mso-fareast-font-family: 'Times New Roman'; color: #444444;">Early activator work, started in 1957, was directed toward investigating factors to get optimum washing results. The empirical information was reduced to a mathematical model. From this, the actual shape of the activator was established.</span>
<span style="font-size: 10.5pt; font-family: 'Helvetica','sans-serif'; mso-fareast-font-family: 'Times New Roman'; color: #444444;">The new design is aimed at large capacity loads, to provide excellent turn-over of clothes during washing and to give uniform soil removal by exposing all clothes to the vigorous washing zone of the activator’s lower area. This design obtains as good a soil removal on 12-lb loads as was achieved on former eight-lb loads. Spiral vanes on the activator draw clothes in and under to achieve proper turn-over at all water levels. The activator is compression molded from phenolic type resin.</span>
<span style="font-size: 10.5pt; font-family: 'Helvetica','sans-serif'; mso-fareast-font-family: 'Times New Roman'; color: #444444;">and:</span>
