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Before Present (BP) years, or "years before present" is a time scale used mainly in archaeology, geology and other scientific disciplines to specify when events occurred before the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, making carbon dating after that time likely to be unreliable.In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating; the alternative notation RCYBP is explicitly Radio Carbon Years Before Present.

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  1. B

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    • before burner control fault firing heatslave lockout not firing worcester
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    • Forum: Plumbing Jobs | The Job-board
  2. R

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  3. N

    Boiler kettling when using hot water

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    • Forum: Plumbing Jobs | The Job-board
  4. C

    Noise when running hot taps and shower

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  5. T

    Toilet seat I've not seen before

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  6. P

    Buying tools as an apprentice (tax refund?)

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  7. A

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    • Adam Everitt
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    • Forum: Plumbing Jobs | The Job-board
  8. D

    New thermostat - does this sound right?

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  9. M

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  10. N

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  11. J

    Ticking boiler

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  12. F

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  13. S

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  14. C

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  15. M

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  16. M

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  17. eagleeye

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  18. AlexGas

    Always empty the pockets before using your washing machine...

    DOH! https://m.youtube.com/watch?v=M9GqlrSzuEw
  19. S

    WC connector into soil stack

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  20. M

    safe electrical isolation check before servicing a boiler

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