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The 'Sunday' archaeologist has the great advantage of being able to give his imagination free rein and ask the specialists disconcerting questions. Naturally I make the most of this advantage to shake the platform on which many prehistoric findings are built up and which is supposed to be sacrosanct. Amateur investigators are embarrassingly industrious. They are assiduous collectors, readers and travellers, because they like to find the best ammunition for their theories in the hope that they will ultimately hit the bull's eye. The Research Institute for Electro-Acoustics in Marseilles moved into a new building in the spring of 1964. A few days after the move several of Professor Vladimir Gavreau's fellow-workers began to complain of headaches, nausea and itching. Some of them were so badly affected that they trembled like aspen leaves. In an Institute devoted to electro-acoustical problems it seemed likely that some uncontrolled radiations in the laboratory were causing the mischief. Using hypersensitive measuring apparatus the scientists covered the building from top to bottom in an attempt to find out the cause of their colleagues’ unfortunate condition. Find it they did. However, it was not the radiation of uncontrolled electrical frequencies. It was low frequency waves which had escaped through a ventilator and subjected the whole building to subsonic vibrations. After the incident he said to himself that it ought to be possible to produce experimentally and deliberately what the ventilator had achieved unintentionally. So he and his colleagues built the first sound gun in the world in the Research Institute for Electro-Acoustics in Marseilles. Sixty-one tubes in a chessboard pattern were fixed to a grille. Then compressed air was blown through them steadily until a note of 196 hertz was given off. The result was devastating. Cracks formed in the walls of the new building; the stomachs and intestines of the laboratory workers began to vibrate painfully. The apparatus had to be switched off at once. Professor Gavreau wanted to follow up this experiment, but first he had a protective device made for the sound gun's crew. Then he built a genuine 'death trumpet’ which developed 2,000 watts and sent out sound waves of 37 hertz. This apparatus could not be tested at full strength in Marseilles because it would have sent buildings crashing to the ground over a radius of several miles. At present a ‘death trumpet' seventy-five feet long is in the course of construction. It is expected to produce sound waves with the death-dealing frequency of 3.5 hertz. After the chosen people had crossed the River Jordan without getting their feet wet and besieged the town of Jericho with its twenty-one foot thick defence walls, the priests were given complicated instructions about marching round the city and blowing their 'trumpets'. The event is described in 3- A 'Sunday' Archaeologist Asks Questions By one of those lucky coincidences which have so often helped research, Professor Gavreau had specialised in the investigation of sound waves for twenty years. Quite apart from the frightening vision such a ‘death trumpet’ conjures up for the future, it reminds us of an event in antiquity. Joshua (6:20) as follows: