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hours

An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions. There are 60 minutes in an hour, and 24 hours in a day.
The hour was initially established in the ancient Near East as a variable measure of 1⁄12 of the night or daytime. Such seasonal, temporal, or unequal hours varied by season and latitude.
Equal or equinoctial hours were taken as 1⁄24 of the day as measured from noon to noon; the minor seasonal variations of this unit were eventually smoothed by making it 1⁄24 of the mean solar day. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second.
In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. However, on rare occasions an hour may incorporate a positive or negative leap second, making it last 3,599 or 3,601 seconds, in order to keep it within 0.9 seconds of UT1, which is based on measurements of the mean solar day.

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  1. H

    Emergency Plumber 24 hours

    Have any of you guys signed up to him? The blogs do make me laugh and I must admit to baiting him a little.
  2. C

    Pressure loss Ideal 24 Combi

    Any ideas about this anyone ? I am filling the boiler to 1.5 bar every 24 hours, pressure gauge is at absolute zero. No obvious sign of any leaks anywhere and this has been going on for a couple of weeks now and would anticipate a visual on a leak now. Boiler installed 14 months ago. Plumber...
    • chesterchops
    • Thread
    • boiler check combi hours ideal outside pressure pressure loss
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  3. B

    four hours later we are home

    good points not drafty,heaters are boiling hot(had to turn them off) not bad on derv got around 30 mpg chassis and bulkhead are solid its a defender ffs bad points theres a growing list..... however i think its the dogs bollacks
  4. M

    Shattered and doing it all again tomorrow - with an hours less sleep.

    This enjoying yourself is hard work. Up at 5, walked the dogs at 5.30 and left home at 6.30 to get to the Easter Celebration agility show at Ardingly. Spent all day there, got one clear round and two with 5 faults and home again at about 5.30. Back there again tomorrow for day two but some evil...
  5. J

    anybody used one

    Hello peeps just got a new contract and its on a time basis, just thinking of ways to save a little time... anybody ever used a milwaukee m12 pipe cutter, To me it looks like u couldnt really get in to tight spaces because of the big head but would like any reviews, cheers in advance
  6. P

    Typical oil consumption

    Good afternoon I had recently posted a thread in the arms about the excessive oil consumption of my Mothers oil fired boiler. A little bit of history for you. The boiler is a Firebird 150k- Model RDB2.2. This was installed approximately 18 months ago by an Oftec registered installer. 5...
  7. P

    Worcester 28i hot water OK, but intermittent c heating fault

    This has happened about once a fortnight over last 2 months now: If I try and switch on my central heating within a few hours of it previously being on I get nothing, no heat, no attempt to come on. (The trip button has not triggered on top of the boiler) I get hot water fine - anytime. If I...
    • pclimie
    • Thread
    • boiler central heating system fault hot hot water hours intermittent leave morning water worcester
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  8. T

    12 hours of hell.....

    ........ So far anyway. Woke up at 5.30 with an acid reflux attack, ended up in A&E again and the pain still hasn't gone away. I feel crippled, the pain is ridiculous, it feels like you're being stabbed in the chest with a blunt knife. Worst thing is, I'm missing my god daughters second...
  9. S

    Divorce

    Lol, how many people are divorced to to working away or long hours?
  10. A

    Camray 5 oil boiler locking-out every 24/48 hours

    I have a Boulter Camray 5 oil fired combi boiler. Every 48 hours or so it trips then restarts first time every time the trip is re-set. My heating engineer initially suggested this was caused by a faulty central heating pump, then suggested it may be the solenoid, both have been replaced...
  11. B

    No hot water but heating works fine..

    Got a Vaillant vcw-gb 242 eh combi boiler. Now 18 years old but serviced annually and worked like a dream, until now. Central heating works no problem. Turn on the kitchen hot water tap whilst the CH is on and the boiler switches off and the pressure rapidly drops off to zero. Without...
    • brianj42
    • Thread
    • boiler central heating system could hot hot water hours no hot water problem registered water works
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  12. L

    Help/advice needed

    Hi I have a problem with a WB Greenstar 40Cdi combi. Any help gratefully receivd as I cant leave the boiler not working (athough it can be topped up twice a day) as there are young kids in the house and it is -5 outside. All is well other than losing pressure (0.5 bar in 4-5 hours) I have...
  13. L

    Central heating pump relacement

    What is the going rate to charge for replacing a central heating pump
  14. B

    Looking for work... Help with my gas hours

    My name is Christopher Branford and i am 28 years of age. I have been plumbing for 6 years and i am coming to the end of my gas course at nescot college. I am looking for a gas safe company or someone who is gas safe to obtain some hours to complete my portfolio in September, in return I am...
  15. G

    Alex the Joiner

    Alex the joiner fits a gas cooker causes £500000 worth of damage and walks free with 300 hours community service. Where is the deterrent? These people had to endure painful burns and skin graft treatment. How many lives could have been lost? Would the sheriff been so lenient if it was a...
  16. W

    work hours,

    when doing domestics i find a lot of customers want me to turn up after 9? they get a shock when i tell them 7.45! if you start at 9 by the time you have unloaded the van got set up and cracked on its allready 10 just wondered what you guys do..
  17. D

    Price

    Hi Was wondering how much everyone charges for small simple jobs because I'm not sure if I'm charging right or not, For example changing a set of bath taps which involved taking the plastic side panel off, hack sawing one of the taps of cas it was seized on then replacing taps in an awkward...
  18. W

    So how many hours do you reckon you worked this week?

    I reckon about 15. Including long overdue paperwork... about 17.
  19. W

    I just spent 8 hours swapping a pedestal basin for a vanity unit basin.

    Fail.
  20. C

    Quick query re bill

    Hello, just a quick query re elderly neighbour's bill for repair to back boiler ..he has been charged a total of £135 for cleaning of existing parts to get pilot light to stay lit. Job took under 2 hours, no new parts needed. Under "materials" he's been charged £7.50 for "smoke pellet, smoke...
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