Or an airbed inflator?

RP

On 19 October 2010 09:34, Michael Watterson <mike@radioway.org> wrote:
> =A0On 18/10/2010 21:19, John Gardner wrote:
>>> a venturi pump - driven by an airline.
>> I've used such - They do work, and they do use a lot of air.
>>
>> Actually efficiency is much worse - Air compressors are not
>> adiabatic - Not mine, anyway.
>>
>> Jack
> I think for 0.5 atm a venturi driven by water tap might work!
>
> or a sealed bag with tap (that can join to bag and apparatus) and big
> spring inside the bag
> open tap
> press down bag
> close tap
> release bag
> connect to small apparatus
> open tap.
> close tap when bag has stopped expanding
> remove bag from tap
> Or two taps.
>
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