They were used back in the pre electronic days, mostly for high revving engines. The dual points stabilized the spark somewhat, gave the coil more saturation time at high RPM. Points bounce when they close, the dual points helped get more power stored in the coil before it was time for the next discharge. Also one set was timed slightly ahead of the other, helped the life of the points, kept them cleaner.
The reason for no vacuum advance, it was intended for full throttle performance, not economy cruising. A vacuum advance is out of the picture under those conditions. You also want repeatable performance, a vacuum advance is just something to go wrong.
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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