An induction melting furnace having an asymmetrical sloping bottom. A system is also disclosed for manufacturing a semiconductor device including a first etch system configured to etch a layer to define a pattern in the layer, and a second etch system configured to measure a physical characteristic of the pattern, determine an etch control parameter based on the physical characteristic, and etch the layer in accordance with the etch control parameter. The refractive index of the clad layer is below an effective index against light in the basic horizontal-lateral mode, and the refractive index of the clad layer is equal to or more than an effective index against light in the 1st-order horizontal-lateral mode. The musical tone generation means allows for the generation of a musical tone in conformance with the position information that has been input in the input means that corresponds to the vibration information that has been input and the correction information that has been stored in the correction information storage means. Each of the blades is pivotally connected to the head member such that each blade is movable between an operational position and a collapsed position wherein the blades are spread away from the head member and positioned to grip the supporting structure in the operational position, and wherein the blades are positioned adjacent to the shaft in the collapsed position. Web destination profiles may be used by applications such as an online application for population-targeted advertising.