What is a double taper line for fly fishing?

as alluded to in yesterday’s post Double Tapered vs Weight Forward Fly Lines – Which is really better?, there’s an enormous amount of let’s say, less than informative information available on the net when it comes to explaining this or that about fly fishing, fly casting and basically fly-anything.
here’s a real gem in the rough in the matter. the poor guy is so lost at attempting to teach us something that he doesn’t know. it would be sad if it wasn’t so funny…. enjoy !

btw, it’s this.
mastery_trout-dt
and to get a little more technical, a taper is:
taper |ˈtāpər|
noun:

• a gradual narrowing: (click the link at the top of the page for Bruce Richards’ basic explanation of mass, weight distribution and other goodies and how they affect a fly line’s performance).
verb:
•diminish or reduce or cause to diminish or reduce in thickness toward one end : the tail tapers to a rounded tip | [ with obj. ] : David asked my dressmaker to taper his trousers.• [ no obj. ] gradually lessen: the impact of the dollar’s depreciation started to taper off .

ORIGIN Old English (denoting any wax candle), dissimilated form (by alteration of p- to t-) of Latinpapyrus (see papyrus), the pith of which was used for candle wicks.

hmm, it turns out that thanks to Mr. DT we found out that the word taper finds it’s origins in candles and we can use it when chit-chatting about trousers so, i guess it aint all bad.

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