Trethevy Quoit 11
Image by stonefree
Trethevy Quoit

Trevethy Quoit

Sanctuary wrote:
Interestingly I was reading just today of the possibility that the capstone hole was drilled out by the Victorians to assist them to put it back after it had fallen! What I find interesting about the hole is that it does give the appearance of being 'drilled out' and certainly when the capstone was in the position (slope) that it is now because the depth of the hole takes a perpendicular angle in relation to the slope.
It shouldn't be too dificult to see if the hole was drilled using a metal tool .
There are examples of holed stones in funerary contexts that are like cup marks meeting from either side , does the hole go straight through or are the holes counter sunk on either side i.e two cones meeting or a straight hole ?

The hole in the capstone has been carefully and beautifully worked. At the moment we suspect it has the properties of a "squircle". or superellipse and the physics of such an aperture, in three dimensions, are under study to discern if the aperture has any of the optical properties associated with such figures. Quite apart from this, however, the capstone aperture was, and still can be, used to directly observe the sun. The Solar Corona can be observed. This is only one of the astonishing things we have found at Trethevy, and I would be glad to answer any questions about the results so far of a ten year study.

David Kane.