sh “a” as in “ Make.”) (English “oo,” as in “ Moon.’’) the apparatus in question may be fitly termed “vowel special molds (Figs. 1, 2, 3, 4), which accurately imi- rent. It thus affords a means of gaging the intensity siren” or “talking siren.” " tate the form of the human mouth in pronouncing a of… … heard under a pressure of 162 millimeters; these five points are then connected by a line and a curve will
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