Stuttering and lisping . of of the mouth. It isdusted with chalk and placed inthe mouth. When a sound is pro-duced, the tongue wipes off thechalk where it touches the palate. INTRODUCTION 115 The tongue or the roof of the mouth may bepainted with ultramarine water color. The desiredsound is spoken. The contact of the tongue withthe palate is seen where the color is wiped off. For more exten-sive recording a castof the roof of thepersons mouth ismade, either withdental modelingcompound or withplaster. From thisa dentist makes athin artificial palateor dental plate ofvulcanite, aluminum, silver
Stuttering and lisping . of of the mouth. It isdusted with chalk and placed inthe mouth. When a sound is pro-duced, the tongue wipes off thechalk where it touches the palate. INTRODUCTION 115 The tongue or the roof of the mouth may bepainted with ultramarine water color. The desiredsound is spoken. The contact of the tongue withthe palate is seen where the color is wiped off. For more exten-sive recording a castof the roof of thepersons mouth ismade, either withdental modelingcompound or withplaster. From thisa dentist makes athin artificial palateor dental plate ofvulcanite, aluminum, silver or gold (Fig. 40). An artificial palate may be made of eight or tensheets of wet tissue paper. A sheet is pressed overthe mold; paste is spread over it, and another sheetis pressed on, etc. It is carefully worked into thedepressions of the mold by the fingers. Whenit is perfectly dry, it is coated with black varnish. For an experiment the inner surface of the artificialpalate is slightly oiled and sprinkled with powdered. Fig. 41. — Palatogram for the vowel black areas show where thetongue touched the palate. 116 STUTTERING AND LISPING chalk. It is inserted in the mouth; the sound isspoken and the artificial palate is removed. Theparts touched by the tongue appear black, the chalkhaving been removed where the tongue touched results may be photographed, painted on a cast,or sketched on paper. Such a palatogram on a castfor the vowel ee is shown in Fig. 41. Palato-grams for typical English sounds are given in PlateIV at the end of the volume. The sounds (a, se, e, e, i, i, o, o, u, r) are termedvowels. For all of them the lips are more or lessopened. When the vowel ah is sung before amirror, the velum can be seen to rise upward andbackward; this clears the passage from the throatto the mouth, and cuts off the passage from the throatto the rear x of the nasal cavity. The velum riseslikewise for a!l the vowels. If the finger is placed onthe front of the neck over th
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectspeech, bookyear1912
