The Celtic Cross

a Scottish born researcher, Company Director and Yachtsman with an interest
in prehistory has applied for a patent on a derivative of the
Celtic cross.                  

This application was published on the 14th of June 2000 under UK
patent application GB2344654A2  Despite intensive research by The Patent Office prior to publication,
no instrument with its complete attributes has been discovered and
its application was not found to be obvious.

The Celtic cross, which is an ancient and sacred symbol, with which
most people are familiar, appears to be a representation of an
ancient instrument that was used by our ancestors as far back as
Neolithic times.

The incredible pyramid of Cheops and the Giza complex, which seems to  embody the mathematical value of PI, would have to be accurately surveyed, as would all similar constructions, including stone circles such as Stonehenge, Avebury and Callanish in Scotland. Callanish is more than 5000 years old and built in the form of a Celtic cross.
Proof that this knowledge predates the Egyptian Pyramids. 

He discovered that the only appropriate instrument that could have been used  by the architect, in the place of a theodolite, was a derivative of the cross.  This incredibly simple, yet complex instrument, has the potential  to measure angles and inclinations to an accuracy of 1minute of arc or 1/60th  of a degree.
One of the most interesting but obscure abilities of the Cross is its capability
to take sidereal measurements. He experimented to discover  the ancient mariners could find latitude and longitude with the cross, 
which confirmed that the ancients could find their position anywhere on the
Earth within 3 nautical miles with a hand held device. This discovery
may help to prove that it was possible for sailors such as the
Phoenicians to have made regular trading contact with the Americas in
pre Columbian times. And perhaps St. Brendan!