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ARchitectonica Militaris, or Mili∣tary Architecture, is the Art of Fortifying. This Art teacheth us how to encline towards the Angles of a Po∣ligone, that is, a Figure of many An∣gles, certaines lines upon which the For∣tress is to be built in such a manner, that the Enemy by whatever side he makes his approach, may be beat back by the lesser number.
Every point of the circumference of the Fortress must be defended by some
other part of the same.
According to the Holland method of Fortifying, the Angle of the Bastion, or the Flanqued, and Defended Angle ex∣ceeds always by 15 degrees the half of the angle of the Polygone; upon this account 'tis that the angle of the Bastion is never streight, or of 90 degrees, unless in a place defended by 12 Bastions; but in places defended by more than 12, it is always streight.
According to tht French method, if the Polygone be a triangle, the angle of the Bastion contains 45 degrees; if it be a Pentagone, or of five angles, it contains 78 degrees; if the Polygone have more than five sides, the angle of the Bastion is streight, or is open 90 deg.
Errard of Barleduc, Samuel Maro∣lois, Adam Fritach, Stevin in Italian, de Lorini, del Cavallero Francisco Tensimi, del Cavallero Alessandro Ba∣rone, de Groote, Herigone.