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  1. chris vaudin

    Dusting off my Labcoat

    How about setting assessed practicals, they might get some that work:vampire:
  2. chris vaudin

    Dusting off my Labcoat

    Nice to have you back Beaker, sounds like a lovely setup.
  3. chris vaudin

    Radioactive storage

    Ask your RPO exactly where in CLEAPSS LO93 it says ground floor only. Provided it is in a secure location it should be fine, and if it's out of your regular workspace then all the better. The only thing I'd suggest is that you notify the local fire service as to it's new location (although when...
  4. chris vaudin

    Hi All I am a Senior technician for over 30 years and have never been told to trial experiments. My HoD is telling me to trial all experients to m

    It depends on the teacher, usually they are happy for me to take the readings, then they do the calculations. Can't beat a bit of team work!
  5. chris vaudin

    AC generator

    Possibly one of the magnets has lost some strength due to a knock. A quick tip on AC and DC settings on the CRO, switching to "DC" will show everything, DC and AC, so is the usual one to use. Switching to "AC" will block out any DC in the signal, useful for looking at small AC signals which are...
  6. chris vaudin

    AC generator

    Technically correct, but many of the items sold as "dynamos" these days in fact have an AC output. Just to confuse the teachers more ours outputs 2 cycles of AC for one revolution;)
  7. chris vaudin

    Unknown glass items, can you shed light on them?

    Nice one Nick, I knew that it would be in there somewhere. The one that I thought it was, the thermoscope, has one bulb blackened, so yours is a much better match. In that case it's not ether in the bulb but water, to quote from the 1960 Philip Harris physics catalogue, it is listed under...
  8. chris vaudin

    Unknown glass items, can you shed light on them?

    I know that the curved one is called a thermoscope & will contain ether, but I can't for the life of me remember what it does - it's something to do with the ether evaporating and condensing.
  9. chris vaudin

    mystery equipment

    I'll take a look through my old catalogues, but the fact that it is Griffin & Tatlock rather than Griffin & George dates it to pre 1954. I've got a Griffin & George 1966 catalogue so hopefully will find something similar.
  10. chris vaudin

    Hello from Wirral

    You've come to the right place for stories;)
  11. chris vaudin

    Burettes - class A or class B

    Maybe have one set of class A for your own use, class B should do for everything else - if your students are like ours, the uncertainties in weighing etc will be much bigger than uncertainties in class B glassware.
  12. chris vaudin


    Hi MTW, the more the merrier:)
  13. chris vaudin

    Power Supplies

    Can you give us an update when you've used them for a while?
  14. chris vaudin

    The stress of small annoyances

    Oh dear, don't get me started, I've got 37 years worth stored up. Particular one is teacher in lesson 1 using kit that has been put out for lesson 2, although it's got a great big sign on it saying "for mister "x" - lesson 2", then not seeing the problem because "you get 5 minutes between...
  15. chris vaudin

    Another Charles' Law thread

    I'm a bit less certain now. I think that by chance I managed to pick one of the few gas syringes that still worked OK, at some time in the past I think that plungers and barrels got swapped. I know that they are sold as being interchangeable but I have my doubts. Anyhow, I just got a few...
  16. chris vaudin

    Sanitising eyepieces

    Actually Paul, I did not mention lens wipes, I said that I use isopropyl alcohol (in small bottles) and lens tissues!
  17. chris vaudin

    Sanitising eyepieces

    That's really up to the teacher to risk assess. Are there any heat sources? What age and ability are the group? Are they likely to misuse the alcohol (it is toxic as well as flammable) or remove it from the room? Is there a spill kit nearby? Are there eyewash facilities nearby in case someone...
  18. chris vaudin

    Sanitising eyepieces

    Only reason for non-alcohol is the fire risk (or perhaps the kids drinking it!). Even pre-covid I have always used isopropyl alcohol as it does not damage lens coatings (which IDA can do), wiped on with a lens tissue to avoid scratching the lens. Our 6th form students are allowed to do the same...
  19. chris vaudin

    coil and magnet meter..

    1200 turn coil (Philip Harris), 1-0-1mA demo meter and ordinary bar magnet works well, although we now use a neodymium magnet as well to show the effect of a larger magnetic field
  20. chris vaudin

    Jelly Baby Wave Machine

    Hi MarieW, the kits only came with enough nuts to do half, so that you could show what happens with a change of medium. For simpler purposes they work pretty well without the nuts on.