Speere [er 
sereaie 
a4 
of 
at 
4 
s- 
ee 
— cae j 
“FECH 
Googe ee 
Hie 
FEE SEE i 
BEECH 
nam 
cH 
et 
Pes 
=e 
ES 
| 
7 
Gat 
To paaae Hane 
Fic. 1.—Curve plotted from the results of traction tests conducted on a dry earth roa 
Average of first 10 trips. 
Pitti 
Fic. 2.—Curve plotted from the results of traction tests conducted on a dry earth r 
Average of second 10 trips. 
