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Gordon Talge has introduced a new thread name, "Theory vs Practice", which
I presume refers to the current argument about steering between
gravitational hills and valleys.

It's a pity, in a way, because it misrepresents that argument, somewhat.

I've been an experimental physicist for the whole of my working life.
Nobody could believe, more strongly than I do, in the importance of
questioning theory and checking it against the real world by experiment and
measurement. There is no conflict between theory and practice: they are
complementary. Where they disagree, something has to give: usually the
theory.

I will quote, yet again, my words to David Hoyte, as follows-

"...an attempt to change the basic laws of science by asking for the
opinions of mariners will be futile. To support his case he needs either
contrary numerical observation or contrary logical argument, but presents
neither."

To this I might add that a reference to a document, describing in some
detail the procedure he suggests, would give us all something to get our
teeth into.

What I dismiss is the proposal to resolve the matter by canvassing the
opinions of mariners: any suggestion for testing the matter on a scientific
basis would meet with no objection from me. Mind you, I doubt if it will
shake our current understanding of the effects of gravity on the surface of
the ocean, or on a ship floating within it. The effects of the force of
gravity are rather well understood, even if its fundamental cause remains a
considerable mystery (to me at least).

As to Gordon's message itself, I can agree with every word.

George.

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