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Ronaldo47

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  1. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  2. This reminds me that the last time I visited Stratford basin ( a couple of decades ago, and not by boat), I found that only the tops of the usual arc of raised bricks for foot grip at the lock gates leading to the river, were visible, having been embedded in cement to produce a perfectly smooth surface The weather was damp, and lack of grip was presenting a problem for the crew of a boat locking through.
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  4. Thanks very much for the explanation of the ratiionale for the military compass using an unit that is normally confined to scientific and electrical engineering calculations. When reconstructing liveries from old photographs, you have to bear in mind that the early photographic emulsions were not sensitive to all colours. Thus the early "ordinary" plates were only sensitive to blue, and would render both red and green as black, the later "ortho" plates were sensitive to blue and green and so would render red as black, and the modern "panchromatic" films are sensitive to all colours, although still over-sensitive to blue unless a yellow-green filter is used. Ortho and Pan emulsions only started to be used around the turn of the 20th century, so virtually all Victorian photos would have been taken on "ordindary" film. Pan cost more than the other earlier types, which continued to be available to general-pupose photographers into the mid- 1950's.
  5. There is an Interpretation Act (or whatever its replacement is called now) that I think contains definitions of what various periods of time mean, such as when they expire, although specific definitions in individual statutes will take precedence over these defaults.
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  8. Some, if not all, LED bulbs include electronic circuitry to provide the light-emitting elements with the correct voltage. Possibly interference spikes generated by the pump are affecting the bulbs. Fitting a suppressor might provide a solution. A simple capacitor connected across the pump connections might be enough. Looping the pump connection wires through a ferrite ring would provide additional suppression.
  9. On my first canal holiday in 1976, we found the winding hole at Fenny Compton occupied by two British Waterways work boats, with their moorings secured by chains. As it was our mid-week turnround point, we had to wind by sticking the bows into the entrance of the nearby marina, ignoring their "no winding" signs. Perhaps the sign might have a point if the winding hole was near a bend or bridge, to provide a warning that you might find a boat broadside on. This happened to us later in the week, where we were rammed broadside on by a British Waterways camping boat and butty that came through a nearby bridge with a breaking bow wave just as we were at the 90° point.
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  15. For some UPS supplies, the invertor only operates when mains is lost. I have an APC UPS that operates in this way. I actually run it disconnected from the mains and powered from a 23A 12V battery charger floated across its 12V battery, having modified it to provide a variable frequency mains supply for adjusting the speed of a synchronous motor. It was supplied with a manual and a circuit diagram, showing the electro-mechanical relay that switches from straight through to invertor when mains is lost, and back again when mains is restored. n.b. I have to float it across a 12V battery because the battery charger is a smart one that only produces an output when it detects that a battery is present for it to supply electricity to. The 12V battery would not be necessary if operated from 12V boat electrics.
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