138 



THE STUDY OF SPEECH CURVES. 



as an approximation. We have thus h {W + 24 + 60 + 64) -f ^ (166 

 + 162 + 153)} = 100 as the distance of the axis below the tangential line. 

 The curve is also found to cut the axis at intervals of approximately 100. 



The analysis is to be made with 36 ordinates. The length of the 

 wave-group is 360mm. ; the ordinates therefore occur at intervals of 10mm. 

 The ordinates are given in the first column of the adjacent table. They 

 are then multiphed by the cosines for the 36 schedules (p. 90). 



Thirty-Six Ordin.\tes from Figure 121, Multiplied by the Cosines. 



The 36 patterns (see schedules at end of this volume) wath perfora- 

 tions and indications of + and — are now appUed. After a pattern 

 has been laid over the table all the figures seen through the perforations 

 are added; those for which the sign of the pattern coincides with that 

 of the table being taken as plus, the others as minus (p. €0). For 

 example, let us suppose the schedule for Ui to be laid over the table. The 

 values for which the signs coincide are 66.1, 95.0, 79.1, 38.4, 37.2, 60.7, 



