156 



HOMOGENEOUS BEAMS 



M O t ** O CO i-i CO T-I i-( T-H o OS O l> rH 00 O lOOOOCOGOOS 

 Tt< iO iO CO t~ t^ 00 00 l> 00 OS O O <-H <N CO 00 * O rH <N CO * 1C 



SrH <N (N IN (N <N C<J O5 CO CO O CD <N t>- CO 00 CO O tXM 00 M CO 

 COI>OOOSOrH(N OSrHCOiOCOOOOS-iiM-* iCt>-O<NiO_t^ 



rH rH (N (N <N <N 



CO <M <-H I-H O OS CO 00 00 b- t^ CO iO * * CO (M (N 



OS OS OS OS OS GO 00 GO OOOOOOOOOO 



00 I-H CO >C b- O5 O O 00 O (M OJ lO t-H CO i-( iO OS OSNiOt^OJ 

 C t^ 00 O3 O ^H CO * O5 rH CO * CO 00 O r-i (N CO <N 3 t> O5 i-i 



,H i-l rH i-l W C<l CN CM W W CO CO CO 



OS^^COOOOINiO^OS <N rt< CO 00 '-H 

 as O O O O i-i ^ >-i 1-t >-i rH ^H rH ^-i (N < 



(N IN <N CO CO CO * * l 



(NlCOOrHT^COOOOrHCO W 00 CO 00 CO l> 

 00 O> I-I 



XXXXXXXX XXXXXXXXXX XXXXXX 



