[Avodah] Re microphone on shabbos

[D&E-H Bannett]

Re: <<There is a machlokes between the CI and the MB as to 
why  umbrellas are forbidden on shabbos.>>

See Mishnayot Tiferet Yisrael (Yakhin Boaz), Introduction to 
Seder Moed, named Kalkalat Ha-Shabbat. There is a long 
explanation entitled "regenschirm," over two full pages of 
small Rashi script, in which the ba'al Tiferet Yisrael 
"proves" that there is no issur.  Even after he hears that 
the Noda' Bihuda has assered the regenschirm, he reviews his 
arguments and sticks by his heter.

I haven't looked at this in many many years and might not 
remember things exactly.  As such heterim are usually 
forgotten nowadays, I recommend studying this "out-of-date" 
halakha.


k"t,

David