In Post #180 of this Thread, a very helpful Poster, saw fit to Post, what appeared to be the contents of : http://physics.ucr.edu/~wudka/Physics7/Notes_www/node6.html I had referenced that Link in my Post #96 of this Thread : For the simple reason that I do not Post anything that I have not read : nor do I soon forget what I read - it seemed to me that apparently some content was missing in the Post #180. For that reason, I believe that the missing content should me Posted in context. I am going to to Post the first part of the content of the Page - which contains content, that for whatever reason, got omitted in Post #180. ***NOTE*** being new to this stuff - I am unable to Post the .gif or diagram ***NOTE*** I will now Post the the beginning of the content and will Bold what seems, to me at least, was somehow omitted. -the following is from (Bold by me) : http://physics.ucr.edu/~wudka/Physics7/Notes_www/node6.html It would seem, to me at least, that the simple omission of this small phrase, from (again, Bold by me) : http://physics.ucr.edu/~wudka/Physics7/Notes_www/node6.html Well, it somehow just seems, to me at least, to , shall I say...affect the gist of the content. This is especially true concerning the overall gist of Post #180 - to me at least.