defining the double bevel edge

[david a goodman]

need some clarification here. when an edge is said to be a "double bevel", are they referring to a ginsu type edge where part of the metal is shaved (for lack of a better term) away and then the final edge runs along the top of that? and if that is the case, would it or would it not actually weaken the edge of the blade since some of the metal is gone? with a few blades that ive done this with, the bevel is about 1/8th of an inch.(some have ended up a little more than that, but defntly no more than 3/16). now, you get a wonderfully sharp edge, but without me being able to do any cut testing, im thinking that the metal will be somewhat fatigued(?) and be more likely to chip and/or break when coming in contact with another blade. any clarification on the terminology and practicality of what im calling a double bevel will be greatly appreciated. also if theres anyone in the lubbock TX area, i really would like to hear from you.
dave

[LafayetteCCurtis]

http://en.wikipedia.org/wiki/Grind

[david a goodman]

great info. only issue i have w what the article said was that with a double bevel "sharpness is sacrificed for resilience". i had mentiond earlier i havent been able to do any test cutting, not entirely true. while clearing a yard, i cut completely thru a 2" sapling w 3 good whacks, with not a lot of effort on my part. no chips, cracks in the blade and the small tree was down. sorry, but i dont see where sharpness was sacrificed in this case. obviously going against a body (especially if armored in any way) would be a completely differnt issue. regardless, still learnd a lot from the page. and again, if anyone has done any practical testing w a double edge, would very much be interstd in the input.
dave