![](http://www.alamy.com/thumbs/6/E4DBCB20-01FA-4515-B598-C4264F495E45/T22YMD.jpg)
Archive image from page 37 of Directional wave measurements during the Directional wave measurements during the Hr. Ms. Tydeman sea trial / by Robert J. Bachman and Edward W. Foley directionalwavem00bach Year: 1985 360 FREQUENCY (hz) r — 2. 270 — 180 — FREQUENCY (hz) T
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Photo credit: © Bookend / Alamy / Afripics
License: Licensed
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