Jacket frame floating structures comprise one or more elongate vertical support columns formed of an open cross-braced jacket formwork of tubular members interconnected together and at least one cylindrical buoyancy capsule disposed in the open framework near an upper end and at least one cylindrical second buoyancy capsule near a lower end in vertically spaced relation. This adaptor is formed with a base and a cover made of a resin material, a plurality of electrically conductive members fixed to the base so as to electrically contact a plurality of IO terminals of the memory card in the adapter, and a metal shell held between the base and the cover. The hollow tube is then heated to drive moisture from the glue and size and shape the hollow tube. An inner switch network of switches Sc selectively connects an analog output terminal to one of the resistors Rc; corresponding to the LSBs so that the analog voltage on the output terminal corresponds to the digital input signal.