— 185 — 



The accuracy of the equation N=vie is shown in the table: — 



III. Euation for Basel Sectsional Area per Cho. 

 Form of density: Thin. 



I. Quality. 



9.1801 



% G =3.3911- 



z.e. G=2461e 



t 

 21.1381 



II. Quality. 



12 2213 

 io^ G = 3.3234- -y— 



_ 28. 1408 



i.e.G=2\06e 



III. Quality. 



15.1832 



/ G =3.2950- 



i.e.G = \972e 



t 

 34.9608 



Age. 



»s=±15.3% 



r =±10.2% 



Diff.>r I in number 



DifF.<r 2 in number 



22 

 25 

 33 

 54 

 60 

 100 



Obs. '■ Cal. 



Diff. 

 % 



Age. ! Obs. i Cal. ^3?- 



591 



696 



866 



1310 



1258 



1596 



586 I -H 0.8 



683 1 + 1.9 



898; - 3.7 



1250 ! + 4.6 



1317 j - 4.7 



1590 i + 0.4 



451 I H- 2.6 



566 ! - 2.5 



1338 I - 8.8 



1399 1 4- 6.4 



m = ±3.9% 



r -=±2.6% 

 Diff.>r 3 in number 

 Diff.<r 3 in number 



23 463 



28 552 



90 1230 



100 1485 



m = ±8.1% 



r =±5.4% 

 Diff.>'' 2 in number 

 Diff.<r 2 in number 



