Abstract: A simple and inexpensive low current fuse consists solely of a rigid rod of electrically insulating material and, extending throughout the length of and carried by the rod, at least one longitudinally continuous layer of electrically conductive material. At each of its ends the thickness of the layer is increased to constitute an effective fuse terminal and, at a position intermediate its terminals, is of such a cross-sectional area that it will melt or otherwise change state to interrupt a circuit at a predetermined overload or short circuit condition. The rod may be of tubular form and, in this case, the longitudinally continuous electrically conductive layer may be on the inner surface of the tubular rod and may extend over each end face of the rod and on to the outer surface of the rod at each end to form terminals of appropriate cross-sectional area.

Abstract: The invention relates to the manufacture of a cadmium sulphide photo-voltaic device. A substrate such as a glass is coated with successive layers which are made, in order, of tin oxide, cadmium sulphide, cuprous sulphide and copper to build up a photo-voltaic junction. In order to achieve a fast deposition rate of the cadmium sulphide while achieving a well ordered crystal structure the cadmium sulphide layer is deposited in two stages, the first involving spraying of a weak precursor solution and the second a substantially more concentrated solution to achieve at least a five times increase in the deposition rate. The invention also describes improved techniques for spraying and reducing the effects of the resistivity of the tin oxide first electrode.

Abstract: An electrodynamic loudspeaker has a diaphragm with a central driven area. Undriven areas of the diaphragm are baffled to minimize the effect of vibrations from the undriven areas which are out of phase with those in the central driven area.