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Geoff Hitchcox
Your tide clock looks lovely. High on my list of jobs to complete quickly is a properly cased four-pointer tide-clock, because it’s a full moon on Monday 25th and a good chance to set it.  One distraction is I’m a sucker for charity shop broken clockwork mantel-piece clocks.  I invariably end up fitting a quartz insert, but I’ve recently found one which responded to my inept tinkering.  Its only problem now is a hanging fourth hammer on its Westminster Chime.  The thing is, first it was running about 1.5 hours slow, and I’ve just got it running to within a minute a day by screwing the pendulum nut all the way towards F except for a couple of turns.  If I can’t get that fourth hammer to drop in time with the rest, I could turn the nut all the way towards S and use it as a mantel-piece tide-clock like you.

Re Tides
Geoff/Frank Reed.  Although George Boole began his professional life as head of Waddington (where I’ve lived since 1970) Village School, I’m afraid digital isn’t my forte.  So, I’m taking time over your figures.  I like to think I overfilled my brain with all that Vulcan analogue stuff.  Well, that’s my excuse.  Similarly, although I made Hydrography one of the many sections of my MSc, partly because it was taught at the RN School of Hydrography in Plymouth, partly because we would be going out in an RN survey vessel, and mainly because there was no exam, it was only a week’s course of and tides were covered in half a morning, so I’ve long forgotten about tidal coefficients.

Tides for the Humber are available from various sources.  Most are supplied originally by the UK Hydrographic Office (See Photograph).  Perhaps I should have read the penultimate paragraph before posting March April online.  Ah well!  I have copies of the HYC sailing programme going back several years of which I could send you one.  The trouble is they only show March to December because space is limited.  A Full year’s booklet covering several different points in the Humber is available from ABP Humber for about £5 GBP, but postage to NZ would be heavy.  Slimmer versions are available here. https://www.fiskprinters.co.uk/product-category/tide-tables/ .  One of the peculiarities of the Humber is that for decades, if not centuries, one of the most popular datums is not Chart Datum, which alters as you go upriver, because the river, of course, flows downhill, but Height above the Outer Sill of Albert Dock, Hull, which is 1.2M below chart datum at Hull.  This probably originated in days of a trawler fleet operating out of Hull

Brough Tide Gauge, like most of the 16 Humber tide gauges, belongs to ABP Humber.  I talked to the head of the Hydrographic Section of ABP Humber Estuary Services.  All the tide gauges record digitally and are archived although some, like Brough, ‘bottom out’ at springs. A set of readings for comparison to prediction purposes might be available to an individual for research purposes, although achieving permission to list values online would be difficult. 

I was intending to write a bit more about Humber Tides above The Bridge, but I found it all here: https://humber.com/Live_Information/Tides_and_Weather/Tidal_Notes/ .  Please note the locations therein are not in geographic order going upriver, and neither do the Tidal Notes mention the effect of fresh water coming down the river, which also has the effect of making the flood shorter than the ebb, especially as you move upriver.  Real time tidal heights of all tide gauges are not yet available online although near real-time values for selected locations are available here: https://humber.com/Live_Information/Tides_and_Weather/ .  DaveP

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