[Avodah] Microphones on Shabbos

[D&E-H Bannett]

Re: <<...the gut instinct that it doesn't fit with the 
gestalt of hilkhos Shabbos....which  explains why so many 
poseqim reached the same conclusion through different means 
... The reasoning is actually ex post facto, justifying 
something they knew to be true in some ineffable way, the 
gefeel of din.>>

This is not justr the feeling of R' -miB. It is stated quite 
clearly by RSZA.  He says the only issur in chashmal is when 
the resultant action is assur, e.g., bishul, hav'ara.  He 
sees no issur when the resultant is, for example, rotation 
of an electric motor, without any issur being performed by 
the motor. But, kvar horah Zaken, ba'al ha-Bet Yizhak 
v'khu...

I have seen a letter written by R' Moshe in which he states 
that he agrees with the chakhmei Eretz Yisrael that the 
issur is in the result.

So R'MB certainly is correct in his feelings in the comments 
partially quoted above.


k"t,

David