A number of theories have been put forth over the years, but none have stood up to scrutiny. Now along comes this wiseguy Frenchie, and he's got a new theory. The best part is that this theory involves secret tunnels that no one has actually seen. Dassault Systems has a web page with a 3-D graphics presentation that explains the whole thing. It's kind of a CPU/Memory hog, but I was able to run it on my four year old Dell. All this make my conspiracy antennae just quiver with anticipation.
One of the clues that led Jean-Pierre to his theory was this image. It was generated from a set of gravity measurements taken in the 1980's. The less dense areas are indicated by the green color, and correspond to the idea of having an internal spiral tunnel.
I did a little looking to see just what kind of equipment would be needed to measure gravity accurately enough to be able to detect a tunnel. I found things like:
Tests run using Sundstrand vibrating beam accelerometers to sense microgravity are described. Lunar-solar tidal effects were used as a highly predictable signal which varies by approximately 200 billionths of the full-scale gravitation level.and
Spring Gravimeters and Other AlternativesEven now it seems to fall in the realm of scientific research, not a practical technique for which you can just buy a meter and go at it. Interesting that the two companies names I came across in all this are both big aerospace contractors: Hamilton Sundstrand and Groupe Dassault.
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