sinusoidaladj.

1878 Mayer Sound 64 Hold the glass up to the light, and you will see a delicate wavy line, a sinusoidal trace.

1879 G. B. Prescott Speaking Telephone (new ed.) 54 The curve expressive of a simple pendulous vibration—that is a sinusoidal curve.

1900 Lancet 1 Dec. 1580/1 These patients have all been treated with the electrical bath and the sinusoidal current.

1910 Hawkins' Electr. Dict. 400/2 Sinusoidal alternator, an alternating current dynamo which generates simple harmonic or sinusoidal currents.

1948 Nature 28 Feb. 295/1 Along with the detailed solutions of the differential equations for step velocity input..is given a brief development of the solutions for sinusoidal input.

1957 G. E. Hutchinson Treat. Limnol. I. v. 357 The height of the wave at first decreases slightly, then increases as the wave approaches breaking. During the final phase of the rise in height, the sinusoidal or trochoidal form is lost.

1975 Nature 23 Oct. 674/1 Patterns of alternating light and dark bars with a sinusoidal luminance profile across the bars—sinusoidal gratings—are commonly used to study spatial interactions in the visual system.

1890 Cent. Dict. at Projection Sinusoidal map-projection.

1969 G. C. Dickinson Maps & Air Photographs i. 17 If a map can be broken in some areas that do not matter—the oceans if map is needed mainly for continental areas, or vice versa—and the meridians gathered together at several ‘central’ meridians the good qualities of the ‘central’ areas are more widely spread. Fig. 4F shows such an interrupted sinusoidal projection.

1888 London, Edinb., & Dublin Philos. Mag. 5th Ser. 26 373 Let f vary sinusoidally with the time.

1929 J. A. Ratcliffe Physical Princ. Wireless i. 3 The simplest form of alternating current is one in which the current varies sinusoidally with the time.

1947 Jrnl. Inst. Electr. Engineers 94 iii. 279/1 When the hemispherical end of a reproducing stylus is moved in contact with a sinusoidal surface of comparable curvature, the stylus tip does not itself move sinusoidally.

1974 Sci. Amer. Nov. 34/3 Voltages and current vary sinusoidally at a frequency of 60 hertz (cycles per second) in the U.S. and Canada and 50 hertz in most other countries of the world.