Tide clock- PBO

[peasea]

February PBO No.434 Page 65 showed a tide clock which seems a good idea.
However I can't understand the text that states-"Not only does the time wheel rotate but it slides horizontally so that it can be adjusted .....etc"
Can somebody explain please.?

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[Weatherlawyer]

A blind guess not seeing the rest of the article:

Does the slide move 6 hours to allow for a coastal trip from Hull to Dover say?

The west of Ireland and Hull have tides approximately 6 hours different from Liverpool, Dover and Wick.

Otoh, it may be something for international travel where the tidal ranges are completely different to home waters.

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[philip_stevens]

I've just re-read the article - and I cannot make out what he means either?????

Perhaps Tony Crowley reads R2R, and can explain what he means.

<hr width=100% size=1>regards,
Philip

 

[eebygum]

Made no sense to me either

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