What is "primary type of articulation" mean?

Articulations may be divided into two main types, primary and secondary. Primary articulation refers to either the place and manner in which the structure is made for a consonant or the tongue contour, lip shape, and height of the larynx used to produce a vowel.

Explanation:

Hope this helps. Sorry if its wrong. :/

photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.