130 



Mr. F.L. 0. Wadsworth on a 



most likely to be used for this purpose. These values are 

 given in the following tables ; — - 



u=l' 5, 



Table 1. 



71-1 



= i=03333. 

















<p. 



^-Jtang0. 



/W=. 



1+5*. 



rs=tanga tang0. 



rs — 8. 



o 



5 



•02916 



100044= 



,1+00044 



+•0011 



+-00066 



10 



•05878 



1-00162= 



+ •00162 



- +-0021 



+•00049 



15 



•08932 



100333 



+ •00333 



+ •0033 



•00000 



20 



•12132 



1-00528 



+•00528 



+ •0045 



- -00078 



25 



•15544 



1-00681 



+ -00681 



+•0057 



-00111 



30 



•19245 



1-00708 



+•00708 



+ •00708 



+ -0000 



n=l'5b } 



Table II 

 n-1 



= •35484. 



*■ 



n Jl} tang 6. 

 n 



/(*)• 



1+8. 



o 



5 



•03104 



I 00024 



1+ -00024 



10 



•06257 



1-00085 



+ -00085 



15 



•09508 



1-00162 



+ -00162 



20 



•12915 



100216 



+ -00216 



25 



•16547 



1-00188 



+ •00188 



30 



•20487 



1-00002 



+ -00002 



An inspection of these two tables shows that in the case of 



* [In a similar table given by Poynting, the sign of 8 is erroneously 

 written negative (probably a typographical error), and there is also a 

 small error in the value of 5 for <£ = 10°, which is, however, unimportant 

 since d itself is so very small for this angle.] 



