Mechanical Monsters at the Fall of Gondolin?

[Maédhros]

Type 1 monsters: mechanical monsters made of iron
Type 2 monsters: mechanical monsters made of bronze and copper
Type 3 monsters: streams of fire often to be confused with animal-fire-dragons

Just so that I'm clear with this, does type four (4) refers to animal dragons or what?

And that does prove good, for as I read the sentence we have know added the animal-dragons of "the brood of Glaurung". For further reference I will call this "normal" dragons Type 4.

Correct me if I'm wrong, but I was under the impression that we were going to make type 2 dragons normal ones, only with the note that they had scales of iron or copper.

As I have already said in the beginning, I think that I would like to distinguish in the Tale each and every type of dragon/monster as to the category it belongs. As to the specific changes that Findegil has made, let me look at every one of them in order to voice my opinion.