Timeline for If the second hand goes backwards, starting from 12:00, how long does it take to meet with the minute hand?
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Nov 29, 2019 at 16:39 | comment | added | Deunis | @Glorfindel I was looking for this answer more than the accepted one | |
| Nov 29, 2019 at 12:36 | comment | added | Glorfindel | @Strawberry I have one of these, they're much rarer :) | |
| Nov 29, 2019 at 9:48 | comment | added | Strawberry | You need to get yourself a Rolex. | |
| Nov 29, 2019 at 9:43 | comment | added | Toby Speight | Swept second hands are normally implemented using an escapement that runs at 10Hz or more, compared with 1Hz for a standard ticking second hand. There may be some inertia and damping to further smooth the motion, but it's still not perfectly uniform. Even in an electronic movement, with stepper motor control, the speed is not perfectly constant. | |
| Nov 29, 2019 at 7:50 | comment | added | eagle275 | Well I think that changed as most clocks now use a quartz drive which leads to distinct second ticks ... While older clocks that used a mechanical spring would lead to almost continuous motion of the hands | |
| Nov 29, 2019 at 1:16 | comment | added | George Menoutis | I have seen one such clock - actually watch. Still rare among the other hundreds of watches i've seen, though. | |
| Nov 28, 2019 at 9:16 | comment | added | eagle275 | remembering my first analogue clock - indeed the second hand movement was not continuous - but "quasi" continuous - the little cogwheels allowed for several small "ticks" before a full second - and with each tick the hand would move a tiny bit - from memory maybe 5 to 6 tiny steps for a full second - in this case they would meet after 59.17 seconds - On second view, the hands usually have different sizes - the second hand is often very thin, while the minute hand is "broad" compared to it (over 1 mm), hour hand again is broader and shorter . So its difficult to say when they really meet | |
| Nov 27, 2019 at 22:04 | comment | added | user45266 | @Glorfindel FWIW, I've definitely seen some continuous second hands. I don't have any proof, but I'm pretty sure that research would reveal many clocks exist in both styles. | |
| Nov 27, 2019 at 22:00 | comment | added | Glorfindel | Virtual-but-analog clocks (like my Apple Watch) maybe. I can assure you that the vast majority of physical clocks does not. I've never seen a continuous constant speed clock. The clocks used at train stations come close, but 1) they're not uniform 2) they go around in ~58 seconds and wait for a central signal to advance to the next minute. | |
| Nov 27, 2019 at 21:50 | comment | added | Darrel Hoffman | This depends entirely on the clock design. Many clocks have hands that sweep continuously without skipping between ticks. | |
| Nov 27, 2019 at 13:15 | history | answered | Glorfindel | CC BY-SA 4.0 |