```Polarity reversal and 180 degree phase shift are two different things.
They only appear to be the same thing for symmetrical waveforms of constant
frequency.

Phase shift is time delay.  Polarity is sign (+ or -).

So to answer Tom's question, if you remove the "(180 degrees)", then the

Ellis

wrote:

> So is it correct to say that there can only be a polarity reversal
> (180-degrees) whereas there can be any degree of phase shift?
>
> -- Tom Fine
>
> ----- Original Message ----- From: "Ellis Burman" <
> Sent: Wednesday, May 06, 2015 7:32 PM
> Subject: [ARSCLIST] Phase vs. Polarity (was Playing Edison Diamond discs)
>
>
>
>>
>>  Oi!  Phase, polarity...........
>>> Polarity is just a special instance of phase shift; 180 degrees!
>>>
>>>
>>>  This is incorrect.
>>
>> Consider an asymmetrical waveform, say square on the positive half, but
>> triangular on the negative. Phase shifting it one half cycle (180 degrees)
>> and adding it to the original waveform will NOT cancel it out.
>>
>> Only inverting the polarity will cause it to cancel.
>>
>>
>> Ellis
>> 818-846-5525
>>
>>
>>

--
Ellis