ABSTRACT
This chapter explains about the less usual vowels like central vowels, rounded front vowels and back unrounded vowels. There can be numerous varieties of central vowels: some are nearer to the front series and therefore resemble i, e, somewhat, while others are nearer to the back series and resemble the back vowels. In the cardinal vowel figure central vowels are placed within the central triangle. The quality of central and centralized vowels is always somewhat obscure and difficult to distinguish. Normal front vowels are pronounced with spread lips, while back vowels generally have a certain amount of lip-rounding. It is possible, to pronounce front vowels with lip-rounding and back vowels with lip-spreading. Back vowels are usually pronounced with lip-rounding, but in some languages there occur back vowels with spread lips: these are somewhat unusual and are difficult to imitate.
