This is the first version of the cymatic simulator of the King's Chamber coffer. I keep it online as a historical reference, for anyone who wants to compare the initial approach with version 2 and reconstruct the path of refinement of the model. The underlying physics is the same — what changes is the geometry of the pressure field, the rendering quality, and the handling of the damaged coffer.
The King's Chamber coffer is a hollow block of granite, carved from a single monolith with millimetre metrological precision. Its internal dimensions, measured by Sir Flinders Petrie in 1883, are 1.9827 by 0.681 by 0.874 metres. The fundamental mode of the long axis, for the intact coffer, is 343 divided by twice 1.978, which gives 86.7 hertz. That would have been the original tone. The present coffer is chipped at one corner, the acoustic length drops to about 1.58 metres, and recomputing: 343 divided by twice 1.58, which gives 108.7 hertz. Tom Danley in 1990 measured 110 hertz. The numbers match.
Mainstream archaeology has always interpreted the coffer as a sarcophagus. But no body has ever been found inside, and its geometry is not that of a sarcophagus: it is that of a tuned acoustic resonator. The original coffer was a harmonic transfer device from the low bands of the King's Chamber to the high bands of the distribution tunnels. With the coffer chipped, the tuning of the system was lost.
For the updated version of this simulator go to the v2 with piezo lab. For the complete model — the Grand Gallery at 250 hertz, the coupling with the Ark of the Covenant, the entire pyramid architecture — the article continues in Vol. 1, Chapter 18 «Giza, the machine».
This simulation visualizes the model discussed in the book; sources and the full argument are in the indicated chapter.