In October 1967, Jean Filloux obtained a tidal pressure record on the deep sea floor off California (see Fig. 1 for locations), using a Bourdon-tube pressure sensor and a time-release device for recovery (Filloux, 1969). In summer 1968, Frank Snodgrass dropped capsules Josie, Kathy and Flicki with Vibrotron pressure gauges; the capsules were acoustically recalled after a month (we believe this was the first time this technique was used), These four records, together with a Lamont station 100 miles offshore to the north and cable-connected to shore (Nowroozi et al. 1966) provided the information required for constructing a rough co-tidal chart (Munk et al., 1969).

Munk, W., and P. Worcester. 1989. An oceanographic time capsule. Oceanography 2(1):48–49, https://doi.org/10.5670/oceanog.1989.38.

This is an open access article made available under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution, and reproduction in any medium or format as long as users cite the materials appropriately, provide a link to the Creative Commons license, and indicate the changes that were made to the original content. Images, animations, videos, or other third-party material used in articles are included in the Creative Commons license unless indicated otherwise in a credit line to the material. If the material is not included in the article’s Creative Commons license, users will need to obtain permission directly from the license holder to reproduce the material.