Abstract: An electronic-carrying module (640), for example for use with a seismic data acquisition cable (400), is disclosed. The preferred electronic-carrying module (640) includes, first, an electronics carrier (106) having access means (107) for providing an easy-to-reach access to wrap-around circuitry fitted inside a curved space (104a) within the electronics carrier (106). Second, a pair of rigid end-fittings (102) spaced apart axially by the electronics carrier (106) for connecting to a section of the seismic data acquisition cable (400). And third, an axial hole (100) formed in the electronics carrier (106) and the rigid end-fittings (102) defining the curved space (104a) between the axial hole (100), the access means (107) and the rigid end-fittings (102).

Abstract: This invention concerns a transducer comprising a layer of active material and a backing plate (110). The backing plate (110) has first and second major surfaces. A layer (111) of active material is affixed to the first surface. The transducer also includes a region adjacent to the second major surface into which region the backing plate (110) can be deflected. The region is substantially isolated from any external pressure incident on the layer of active material. Moreover, the backing plate (110) and/or layer of active material (111) is of a non-uniform thickness. Preferably, the backing plate (110) is thicker at a central region thereof than at an edge region thereof.