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A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, year and galactic year. Devices operating on several physical processes have been used over the millennia.
Some predecessors to the modern clock may be considered as "clocks" that are based on movement in nature: A sundial shows the time by displaying the position of a shadow on a flat surface. There is a range of duration timers, a well-known example being the hourglass. Water clocks, along with the sundials, are possibly the oldest time-measuring instruments. A major advance occurred with the invention of the verge escapement, which made possible the first mechanical clocks around 1300 in Europe, which kept time with oscillating timekeepers like balance wheels.Traditionally, in horology, the term clock was used for a striking clock, while a clock that did not strike the hours audibly was called a timepiece. This distinction is no longer made. Watches and other timepieces that can be carried on one's person are usually not referred to as clocks.
Spring-driven clocks appeared during the 15th century. During the 15th and 16th centuries, clockmaking flourished. The next development in accuracy occurred after 1656 with the invention of the pendulum clock by Christiaan Huygens. A major stimulus to improving the accuracy and reliability of clocks was the importance of precise time-keeping for navigation. The mechanism of a timepiece with a series of gears driven by a spring or weights is referred to as clockwork; the term is used by extension for a similar mechanism not used in a timepiece. The electric clock was patented in 1840, and electronic clocks were introduced in the 20th century, becoming widespread with the development of small battery-powered semiconductor devices.
The timekeeping element in every modern clock is a harmonic oscillator, a physical object (resonator) that vibrates or oscillates at a particular frequency.
This object can be a pendulum, a tuning fork, a quartz crystal, or the vibration of electrons in atoms as they emit microwaves.
Clocks have different ways of displaying the time. Analog clocks indicate time with a traditional clock face, with moving hands. Digital clocks display a numeric representation of time. Two numbering systems are in use: 24-hour time notation and 12-hour notation. Most digital clocks use electronic mechanisms and LCD, LED, or VFD displays. For the blind and for use over telephones, speaking clocks state the time audibly in words. There are also clocks for the blind that have displays that can be read by touch. The study of timekeeping is known as horology.

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  1. M

    Clock stopped on boiler.

    Hi, I have a Worcester Bosch Greenstar 30Si combi boiler, the analog clock has stopped and the On-Timer-Off switch only works on Timer setting,. So I have set all the little timer switches to ON and the boiler does work then. Any help or source for a new clock would be great. TIA
  2. R

    Ideal Logic Combi ESP1 Time clock jumper link

    Hi looking to remove my existing rf time clock and refit the oem link, but the installer didn’t leave it, anyone point me in the right direction
  3. S

    Unvented Cylinder set up via gas system boiler and time clock

    Hi I wanted some steer from he forum for my set up. 2 storey house now extended on ground and a loft conversion. New plumbing install as of 18months. Worcester bosch 8000 life sysem boiler via natural gas. Time clock with HW / CH split, 7 day digital. 250litre Gledhill Select Indirect...
  4. B

    Oil Heating staying on when clock is off

    Hello, My heating is coming on when the clock is off and typically this has been a motorised valve failed but i have checked both valves, (i believe both replaced in last two years and the manual levers are solid i.e closed). Now what is strange is that full heat gets to the radiator closest to...
  5. R

    URGENT boiler kicks in and rads get very hot when clock is in off mode

    so we dont use the timer mode on the honeywell clock just put the heating on when we want and off when we dont manually a few times recently but not every day the boiler starts up when we have turned it off the rads all get very hot far hotter than we ever set the temp too all except for the...
  6. K

    UFH has its own pump that keeps running round the clock!

    Hi, I moved to a house recently where it is installed with city heating system. As I understand from past records, the original house had only radiators that were fed by a thermostat-controlled heat exhanger with a pump to circulate hot water. One of the previous tenants installed under-floor...
  7. M

    Ideal combi 30 mechanical timer 215390. Clock does not work.

    Fitted this timer. Simply plugs in. Everthing works on it except that the actual clock does not work .
  8. H

    Timer clock and pump

    Hi .there, can anybody give me advice on how to set up this digital clock. My ufheating is not working and I am trying to figure out if it is the timer or the pump. The pump will get very hot and the pipes over the thermometer will also get hot, but as soon as I turn on the radiators for the...
  9. D

    Boiler clock losing time

    Hi I have a Main Eco Elite boiler which is three years old with a Gassun mechanical clock fitted . The issue I have is that it keeps good time during the day but loses an hour (sometimes two ) overnight ! This is rather strange as if a faulty clock I would expect it to lose time constantly ...
  10. G

    Clock not working on Worcester Bosch MT10RF/mechanical RF thermostat

    Hello The clock has stopped working on my Worcester Bosch MT10RF/mechanical RF thermostat. I have changed the batteries but the clock still does not work. There is a radio link with the boiler as the light is green. And I can switch the heating on by just using the bottom left hand switch to...
  11. K

    Wiring combi digital clock

    Hi I have an iqe simplicity combi and want to fit the optional digital clock, I purchased an original but have no wiring diagram, I have fitted the wires on to the back of the clock as I would think they go (see photos) I just want to confirm this is correct before I fit the plug into the...
  12. N

    Siemens RWB2E slider switches

    Hello, We've been having a few issues with the central heating control unit. Last night I finally got round to reading the instruction manual but when I attempted to use the control unit (siemens RWB2E) the slider switches are completely stuck and will not move. We have been able to put...
  13. M

    Greenstar 27cdi Worcester boiler - Clock problems!!

    Hi, I'm a newbie to this forum so hoping someone can help with this as sick of getting up at 5am to a cold house!!! i have just moved into a new house and the boiler is a Worcester Greenstar 27cdi - boiler works fine when using the on/off control however when I tried to use the timer...
  14. N

    ferroli modena 102

    boiler will not turn off unless you turn it off at the main switch it seems to be bypassing the time clock and running ch all the time when h/w called for no probs i have disconnected time clock from boiler and boiler still doing the same
  15. I

    Time Clock for Sime DGT 25 BF

    The mechanical time clock on my Sime Metropolis DGT 25 BF seems to be faulty 'cause the time of day is often wrong. I can hear a whirring noise like a small motor running. Is there anything I can do with it to make it work properly. I've tried a couple of web sites for a spare clock (Sime...
  16. V

    Vaillant Eco Tec Pro 24 Timer not working.

    Hello, the hot water works fine, and the clock works and ticks away, but the heating doesn't come on either with the timer or when we turn it to 'on'. The clock we have is the round dial with little pegs round the side to push in to set the timer. We've also turned it off and on, and at the...
  17. S

    programmer

    my brother has just phoned me complaining his time clock isnt working just worked out when i fitted it its a landys and gear mini minder any guesses how old it is?
  18. N

    Valiant Ecotec plus 831 conversion to system boiler?

    Hi all, I Have a client who has the above boiler and is wanting to add an unvented cylinder, underfloor heating etc in an extension. My question is can i convert the combi to a system boiler? If i can any ideas on the best method of doing this? Thanks Rob.
  19. Sparkgap

    Ghostly clock

    Interesting little problem: local scout hall has a clock on the wall, Smiths quartz same as what goes in schools. Has a problem keeping time, in fact it was so far behind that I replaced the battery three days ago and in the next 90 mins it lost a quarter hour. Took it home and left it in the...
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