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28XX

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Posts posted by 28XX

  1. Put yourself in the mindset of the engineer building the line. If he is importing material to site to build an embankment, it is cost effective to build subways then form the bank over.

     

    This is the way to answer so many questions when devising fictitious locations. Imagine what the scene looked like in the agrarian, bucolic 18th century; then thrust some industrialisation upon it.

  2. I would, but I'm only just keeping the b*gger away myself!

     

    The drive around Fraggle Rock today resulted in a mediocre pub meal, being half frozen whilst having an ice cream in Port Erin, rain in Douglas, stopping on the headland to watch my colleagues at Groudle Glen being busy with Easter Egg trains that I should be taking part in and then getting home to glorious sunshine. Should have stayed here!

    Guess what? The very act of writing down what was going on in my head, objectivising it, was enough to start a trickle of enthusiasm. Just come in from the garage with a modest sense of achievement. A job I had been putting off for weeks, realigning the supports for the storage area, is now done.

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  3. Bank Holiday Monday. Instead of cracking on with Stourhampton while I have got chance I'm mucking about on my iPhone with a large but invisible Black Dog sitting on my lap.

     

    Can somebody tell me to snap out of it please?

  4. I would like to point out that a dangerous generalisation has been asserted here which does not apply in all circumstances.

     

    Many electromagnets will work on ac and dc, and for momentary duty in model railways, this is safe enough, (the buzz from ac is more anoying to me than a solid clunk from dc however).

     

    For longer duties periods, e.g. a relay or contactor, you don't have as much freedom. The ratings given in the specifications must be followed. In a former job as a maintenance engineer I fitted a ac relay instead of an dc one in desperation to get a machine working when we had no stock of the right part. It self destructed quite spectacularly before the end of the shift.

     

    I think in a dc circuit, once the armature has moved and the core is saturated, the only impedance to current flow is the resistance of windings. On ac, there is a continuous inductive impedance as long as the circuit is energised.

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