Re: Zeiss Ikonta Shutter - Rapid and Synchro - both have flash?

"Nicholas O. Lindan" <see@[EMAIL PROTECTED]
> wrote in message 
news:13sgm32grp8im68@[EMAIL PROTECTED]
> "Ken Hart" <kwhart1@[EMAIL PROTECTED]
>
>
>> but I think a solenoid would require high current (amperes)
>
> It's not really current but 'ampere-turns' that are required.
> If you wrap twice as much wire around the coil you need 1/2 the
> current.
>
> However, when you lower the current requirement you also increase
> the inductance of the solenoid, and this makes it slow.
>
> To make the solenoid faster you can increase the voltage and
> decrease the wire size to limit the current.
>
> The whole thing becomes a 5-way trade-off and you can make
> a solenoid that works on any voltage and current you wish if
> you are willing to trade off speed, strength and/or stroke
> (and cost).

A 5-way trade-off? I can deal with E=IR and "ELI the ICEman, but a five
way 
trade? Would that be a pentratradic equation?

>
>> while a flash bulb would require votage.
>
> It's both voltage and current: volts * amps = power,
> and it is power that lights off the flash.  The
> bulb can be designed for any voltage desired.
> Most flash bulbs will fire at 3 volts.  The
> 22.5 V BC (battery & capacitor) flashes were more
> reliable as they had enough voltage to punch-through
> any dirt in the bulb contacts or poor contact between
> the spun wires in the bulb.

Back in my college days, (Pennsylvania Governor's School for the Arts at 
Bucknell University), we used to sneak into a dorm room, remove the light 
bulb from the ceiling fixture and screw in a flashbulb (#5?). Then we
waited 
for the occupant to return. 110V was plenty of voltage to fire those
things!