Velar "k" vs. English "k"?

[Nadja Adolf]

I'm having a little trouble understanding some of Boas
definitions.

In Boas Chinook Texts pronunciation guide he describes
the use of certain characters:

q velar k
k English k

The problem I am having with this is that George Yule
describes the k sound used in English - in cook, kick,
kid, and cat as an "unvoiced velar."

He also describes the "voiced velar" in English - the
English g as seen in go, give, and bag.

What did Boas mean by "velar k" and "English k".

Also, Boas lists "obscure vowels." I can't find a
definition for this. Does anyone have one?

Thank you.

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