Digital Library Search
![A Kelvin Tide Predicting Machine ca theb4105.jpg A Kelvin Tide Predicting Machine ca](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb4105.jpg?itok=3mtg5jWN)
Description
A Kelvin Tide Predicting Machine ca. 1926. This particular model was used byJapan, Portugal, and the Tidal Institute of Glasgow.
Collection
Historic Coast & Geodetic Survey
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.