Semiarc and Alchabitius directions

The subject of semiarc vs. alcabitius method of directing has been discussed since many years (( see above all Kolev and Gansten )).It’s very easy (quite easy at least) to show as the two methods are just one, and we will repeat the experiment here taking our example from Quadripartite, III, 10 (your gentle writer has read the Italian translation cura Prof. Giuseppe Bezza).

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