Albert Henry Arden, A Progressive Grammar of Common Tamil (1910)
“ As a consonant cannot be sounded without the help of a vowel, it is necessary to introduce the sound of a vowel, in order to pronounce the consonants in any alphabet. Thus, in English, the sounds of the vowels e and a respectively are introduced to pronounce the consonants b and k, as be, ka. In pronouncing the consonants in the Tamil alphabet, the sound of the vowel is uniformly introduced. It is not written, but understood: hence the vowel அ is considered as inherent in each of the eighteen Tamil consonant forms. ”
