10 



Mr. Daniel Jones 



[Feb. 9, 



be pushed along (by means of the handle D) and made to project to 

 different lengths from the end of the tube. A projecting piece of 

 metal, called a "tooth-stop " (E), is attached to the tul)e ; it can be 

 fixed at various points. FGH is a wire handle. 



Fig. 3. 



Atkinson's Mouth-Measurer. 



ACB tube, D handle of wire, 



E tooth-top, FGH handle. 



Fig. 4. 



Atkinson's 



Mouth-Measurer 



in Position. 



To use the instrument, it is placed in the mouth either in the 

 manner shown in Fig. 4, or else so that the tube is in contact with 

 the teeth at the tooth-stop and also in contact with some point of the 

 palate (the position of the apparatus depending on the nature of the 

 sound to be analysed). The wire is then pushed along until the end 

 of it is felt to touch the tongue. The instrument is withdrawn and 

 applied to a previously-prepared diagram of the shape of the observer's 

 palate. The position of the end of the wire is then marked on 

 the paper. 



Further observations are then taken with the tooth-stop fixed at 

 other points. In this way the positions of other points of the surface 



