Discussion on “submarine signaling” (Blake), Philadelphia, Pa., October 12, 1914. (see proceedings for October, 1914)

W. S. Franklin: When you lower that oscillator into the water, the two diaphragms are working in like phases, are they not? H. J. W. Fay: Yes. That means that the water on one side is being compressed. W. S. Franklin: Don´t you cover one of those diaphragms completely, and only expose one to the water? H. J. W. Fay: This diagram doesn´t show the water-tight oscillator as it should. This is a form of scillator that was put inside the ship, not put in the water. A water-tight oscillator has a ring around the base of the pole piece, and the third diaphragm is mounted on that ring, and this rod excites that diaphragm.