Dennis Lee Bieber  wrote:
> On Sun, 4 Aug 2019 12:17:58 -0700, Mike Easter 
> declaimed the following:
>
>> NY wrote:
>>> I never knew that early ultrasonic remotes were mechanical whistles
>>> operated by the buttons.
>>
>> Another US strategy was 'banging' an aluminum rod which emitted the US tone.
>>
>> I don't know, but that might've been how mine worked.  I never
>> disassembled it, but the clunk seemed/ felt/ sounded/ more like a hammer
>> blow than an 'accordion'.
>
>  The bellows style felt like squeezing a small balloon until it popped
> -- ie: increasing back-pressure with a sudden release.

And the hammer/rod type felt like loading a spring until it triggered the
hammer with a “click”.

--
-michael - NadaNet 3.1 and AppleCrate II:  http://michaeljmahon.com

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