Exact Facsimile Reprint of Original Edition Published:. 5 p. A veryinteresting Spiral Calculator Chart System, again quite like what Gannmade, a Spiral Chart called the Equilibrium Chart and even a Master Chart.Many of these astrologers from this time were in the same small circle asGann, so it is not uncommon to find cross over between many of their workssince they shared ideas with each other.