MK-MOIK'S Ol- TIIK NAIIONAI, ACADKMV OF SCI KNCKS. 



If) 



III l"i^;s. ii Miiil 7 ail' ((iiitnisttMl in likcmaimi'r tliii isoiffoiial ciiivcs lorflic an}il<i.s f..=.'{l»', iiml 

 ihc snp|il<iii<Mi «>r .'.0". In ri;:. li tlic cnivc 'ff' —5 is wanting, and in Fin. " "'O two cnrvi'H 

 ;.■>. ami 'u ='-'0 an- l>iitli wantinf,'. 



FiB. 6; M=30=. FIk. 7i« ISO. 



Ill lii<r niaiim r aic lo 1..' explained the Figs. 8-18. The numbers needed for drawing the lig- 

 les are liiinislietl by t<iiialii.ii (1.5). The curves that in earli tigmc separate the shaded area from 



t'ig. 8; w=4(F. rig. 9; «.=140°. 



<1 area are the cllii.ses for -S =20, and '« =-20. Tin' sliadi 

 line iiMdily tin- ( <.rn-s)«)adiii- einves in the fignres. 



