Abstract: A supply circuit for a fluorescent tube installation with a high-voltage transformer (T) which is connected, input-end, to a supply voltage with a frequency of several hundred Hz, and which is formed without an air gap. To replace the air gap in the transformer, an electronic regulator (EST) is nonetheless used in the supply circuit, which emulates the current-limiting function of an air gap. The frequency of the supply voltage is between 300 and 800 Hz, preferably 400 Hz. As these frequencies are higher than the usual network frequency of 50/60 Hz, the size and weight of the transformer can be considerably reduced.

Abstract: A barbless fish hook having particular application to fly fishing. The fish hook has a flat barbless point which is specially shaped to penetrate and remain embedded in fish and yet can be easily removed by the fisherman. The point has opposing flat surfaces, one of which faces the shank. The side edges which bound the faces of the point converge from a pair of nodes to form a sharp tip. The width of the point between the nodes is greater than the diameter of the wire which forms the bend of the hook.

Abstract: A flexible elongated tubular attachment to be interposed between the fly fishing line and the leader line to eliminate the necessity of knot tying the leader to the fly fishing line.