"Monday, February 24. By now Detective Briggs had talked to an engineer, a chemist, a physicist, and others. Some thought that vibrations in the house were causing the trouble. These could come from underground water, they said, or from high-frequency radio waves, or from sonic booms caused by airplanes. Others said that the electrical system was the cause, or down drafts coming through the chimney. The popping of bottles was blamed on chemicals the bottles contained.
Tests showed that there were no vibrations in the house; there was nothing wrong with the electrical system; and there were no chemicals in the bottles that would make them pop.
Then WHAT was causing the trouble?"
Forgive my long absence.