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250 × 250 Looking in Uri’s mouth – New Scientist – October 17, 1974

Figure 3 By 1964, Puharich had improved the amplifier so that it could be mounted on the back of the tooth.

In this drawing, the amplifier “is greatly exaggerated in size to facilitate description” and would, in fact, be hidden under the tooth cap. The amplifier has a terminal on the left which must be touched with the tongue to complete the circuit. Drawing from US Patent 3 156 787