The Design follows.
Nu. 2
The Groundplot of the work, as when first built, in a greater form, with the foure equilaterall triangles making the Scheame, by which the whole work was composed.
H
The six principall entrances, three whereof directly opposite to those of the Trench.
I
The stones which made the outward Circle, seven foot in breadth; three foot and an half thick, and fifteen foot and an half high: each stone having two tenons mortaised into the Architrave, continuing upon them, throughout the whole circumference. For, these Architraves, being joynted directly in the middle of each of the perpendicular stones that their weight might have an equall bearing, and upon each side of the joynt a tenon wrought, (as remains yet to be seen) it may positively be concluded thereby, the Architrave continued round about this outward circle.
K
The smaller stones of the inner circle, one foot and an half in bredth, one foot thick, and six foot high. These had no Architraves upon them, but were raised perpendicular, of a pyramidall form. That, there was no Architrave upon these, may be hence concluded, the stones being too small to carry such a weight, the spaces being also too wide, to admit of an Architrave upon them without danger of breaking, and being but six foot high, there could not, possibly, be a convenient head-height remaining for a passage underneath, especially, considering fully the greatnesse of the whole work.