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July, I929, the need for equipment and methods that will reduce the weather hazards of air transportation is pointed out. During the past three years research work carried on by the bureau has led to developments through which weather and landing conditions can be communicated to pilots while in flight and through course navigation, flying can be done satisfactorily regardless of fog. The article describes particularly the work done by the Bureau of Standards on the development of the visual radio range (directive radiobeacon) with a description of the new radio range which is capable of indicating I2 courses in space.
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## Abstract This article derives simple CAD inductance formula of doubleβlevel spiral inductors by analytical moment method, synthetic asymptote, and the duality of inductance and capacitance LC = ΞΌ~0~Ξ΅~0~ of the transmission line theory. The main contribution of this article is the mutual inductan