-ON CERTAIN PROBLEMS IN REFRACTION. 349 



Inclination, or Dip. 



Needle No. 2. 



Marked End. 



Means by Polarities. 



Series I. Series II 



Resulti 

 Dip. 



Lutesville 



Charleston 



Poplar Bluffs 



Piedmont 



Arcadia 



Pilot Knob, b ... 



De Soto 



Pacific 



Cuba 



Salem 



Houston 



Howell Co 



Beardstown, Ills. 



67°36- 

 67 38 



66 59 



67 14 



68 28 



69 50 

 68 38 

 68 53 

 68 05 

 67 46 

 67 04 

 67 24 



70 07 



4 67°57' 



967 56 



7|67 20 



367 51 



9 68 38 



o 70 02 



68 48 



68 05 



68 27 



68 10 



67 27 



67 43 



70 13 



•i:i67°39' 

 •7|i67 37 

 .8,67 10 

 .o',67 17 

 .6'l68 22 

 .8 69 48 

 •9: 168 34 

 68 52 

 68 04 

 67 50 

 67 03 

 67 18 

 70 05 



67°54'-2 57°46 

 67 58 .2[67 47 

 66 21 .7] '67 10 



467 47 .9 ;67 32 



3 



7 



3 



4 



4 



4 



68 43 2.] 68 32 



70 04 .i!i69 56 



68 52 •8;68 43 



6q 06 .7 68 59 



68 28 .2 

 68 07 .2 

 67 27 .6 

 67 50 . 1 

 70 15 -8 



68 16 

 67 58 

 67 15 

 67 34 

 70 10 



Jul/ 6 



Needle No. 3. 



station. 



Arcadia 68 47 



DeSoto ,68 58 



Cuba 168 34 



Salem 68 20 



Houston 167 35 



Howell Co 67 57 



Beardstown, Ills. • • • 70 42 



Lutesville 68°i9'.5 67°34'. 



Charleston 68 07 -o 67 25 . 



Poplar Bluft's 67 34 .667 



68 23 

 68 3.=; 

 68 08 



67 49 



66 59 



67 22 

 70 26 



Means by Polarities. 



Series I. Series II 



67°57 

 67°44 



67 23 



68 33 

 68 41 

 68 21 

 68 04 



67 17 

 167 41 



Resulti'g 

 Dip. 



67°5S -7 ,67°56' 

 67 47 -6167 46 



67 

 6836 



.968 S2 



.6 68 21 



.8 68 04 



•367 16 



6 67 38 



O 26 -2 70 26 



7 167 17 • 

 3 ,68 35 • 

 7i 68 47 

 3I168 21 

 5 68 04 

 7 67 17 

 .4 67 40 

 .7 70 26 



July 6 



Au£ 



