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seconds to be represented on a 24-hour dial (if seconds are shown, they will tend to be in a subsidiary dial, as is the case on the clock at
Greenwich), but the same principle generally holds (as is the case on the Vostok watch photographed). I have also seen some 24-hour clocks on which the minute hand completes a revolution in two hours (i.e. an hour represents a five-minute interval). Either way, if a minute-hand is used it should be immediately obvious from the 0-60 markings which system is being used. Because the 24-hour dial has no established convention for a minute hand and people are unused to reading them, great care has always been taken to include 0-60 markings, on dials as diverse as the
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for his H1 chronometer (although it's not strictly necessary as the hands are all in separate dials anyway): he used double-ended hands. For example, the hour dial is marked I to XII twice, with the hour hand completing a full revolution once in 24 hours, and at any given time the hand would point to
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I came on here looking for what the second hand and minute hand do on a 24 hour clock/watch, but the information isn't here. Do they go round once per minute/hour on once every two minutes/hours? i.e. Does each interval still represent 5 seconds/minutes or does it now represent 2.5 seconds/minutes?
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The usual convention on 24-hour clocks is to keep the minute hand to one full revolution per hour – i.e. an hour's interval will represent 2.5 minutes. This is the system used on the
Shepherd Gate clock at Greenwich, and all of the clocks photographed which have minute hands. It is unusual for
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the relevant number both ways. Similarly the seconds and minutes dial are marked 0 to 60 twice, completing a full revolution in two minutes or two hours, with hands pointing to the relevant number at both ends.
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Could sb. please reword the paragraph? It is not even grammatical at some points. Thanks in advance.
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267:(and, in fact, just about any astrolabe-style astronomical clock, apart from a very unusual one by
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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on
Knowledge. If you would like to participate, please visit the project page, where you can join
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The second quote from
Nineteen Eighty-Four is incorrect. It should read "The clock’s hands said
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and the Vostok watch (but not on the blue Swatch photographed – appalling design).
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Last edited at 08:30, 13 June 2009 (UTC). Substituted at 19:43, 1 May 2016 (UTC)
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Perhaps the most innovative solution to the issue is the one used by
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Most old 24-hour clocks such as the
Venetian tower clocks or the
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