[GreenKeys] introduction

[Sam Hallas]

Martin wrote [but not publicly to the list]:
>  Nice in theory but from experience heard from other museums it would
>   probably be a waste of time trying to use a real old mains 80 0 80
>  unit as it would be rejected by the museum ealth-n-safety mob.

Only if they're the all-too-prevalent bonehead type that don't 
understand what they're on about. Those are the people that want to ban 
games of conkers in school playgrounds or chop down chestnut trees in 
case the nuts fall on people.

Give me a reasoned and quantified risk assessement as to why it might be 
considered dangerous. I have worked in a risk aware environment on the 
railways where we know all about how risk should be managed.

>  Building a new one might therefore be necessary but even then, being
>   over 50 volts, it might get banned from hands on display!

Wait a minute..... The telegraph supply is entirely encased in the 
equipment which has an earthed case. So how does that become dangerous? 
At no point does it come anywhere hear the operator. No nearer than the 
mains supply to the motor.

The key hazard on a teleprinter is the presence of rapidly rotating 
parts, which are normally enclosed behind a cover, preventing accidental 
contact with fingers etc.
Sam

>  Sam Hallas wrote:

>  Through a contact with BARTG I'vebeen trying to help a group in the
>  Wirral get a couple of 444s working in the Naval Radio Museum > >
>  display. They are short of an 80-0-80 power supply. Any ideas where
>  there might be one lurking and looking for a new home?