Abstract: A surface acoustic wave (SAW) device has an input interdigitated transducer (IDT) and an output IDT. One of the transducers is formed as two loops which are interconnected so that unwanted magnetic feedthrough voltages induced in or by such current loops cancel, while currents producing or produced by the SAW add.

Abstract: A system is described for manufacturing hydrogen gas which utilizes the energy of surface waves in a liquid, such as an ocean. The system first converts the energy of surface waves to mechanical energy by apparatus comprising a buoyant helical member mounted for rotation about an axis. The pitch of the helical member can be matched to the length of the expected waves and the member is floated on the surface with its axis oriented so that each wave traverses the helix lengthwise and buoyantly supports successive sections thereof causing it to rotate about its axis. The helix is coupled with rotary driven means to an electrical generator, wherein the mechanical energy is converted into electrical energy in the form of DC current which in turn is employed to electrolyze ocean water to produce hydrogen gas which may then be compressed or liquified, e.g. for storage and transportation.