1 1 r- 



Figure 11. Distribution of N and T for experiments 84 to 104 with 

 the 0.21 -millimeter sand. Asterisks denote experiments 

 with the bed initially leveled. Symbols are defined in 

 Table 1. Arrows point downward to observations of Tj. 

 and upward to supplementary observations of T^. 

 (a = 0.4576 N centimeters.) 



37 



