38 



Land Magnetic Observations, 1905-10 

 Magnetic Observations and Computations. 



Total Intensity: Loaded Dip Observations. 



Station: Middlebury, Vt. Date: Thurs. July 28, 1910 



Dip Circle No. 178 Needle No. 8 loaded; wt. 31 



Obs'r: P. N. S. 



End of needle marked A north* down 



Circle East 



+44 57.5 



Circle West 



Needle Face West 



315 01 

 00 



00.5 



N 



135 15 

 15 



15.0 



+44 54.8 



+44 52.2 



Mean //: 



Circle West 



Needle Face East 



315 10.5 

 10 



10.2 



N 



135 17 



17 



17.0 



+44 46.4 



Circle East 



Needle Face West 



225 06 

 07 



06.5 



N 



45 15 

 15 



15.0 



o f 



+45 10.8 



o f 



+44 56.7 



o / 



+44 58.6 



End of needle marked A north* down 



II 



Circle East 



Needle Face East 



o I 



225 02 

 02 



02.0 



N 



o / 



45 14 

 13 



13.5 



o / 



+ 45 07.8 



Circle West 



Needle Face West 



o / 



315 00 

 01 



00.5 



N 



o / 



135 13 



14 



13.5 



+45 00.4 



+44 53,0 



Mean /j': 



Circle West 



Needle Face E^st 



315 15 

 16 



N 



135 22 

 24 



15.5 23.0 



o / 



+44 40.8 



Circle East 



Needle Face West 



225 08 

 10 



N 



45 15 

 17 



09.0 16.0 



o ' 



+45 12.5 



o ' 



+44 58.5 



o ' 



+44 56.6 



Chron. time beginning 

 " " ending 



Mean chron. time 

 Chron. corr. L. M. T. 



Local mean time 



Magnetic Meridian reads 



h m Temp. 



15 30 27.4 



16 55 28 .1 



16 12 27.75 

 + 7 



16 19 



178 06' 

 358 06 



Dip = 7 = +74 26.9; = /-/' 

 . . for I = 29 30.2 

 " II = 29 28.4 



Log. cos I' 

 " CSC u 

 " CSC 111 



Sum 

 I Sum 

 Log. C 

 " F 



Mean Log. F 

 Log. cos I 



H 



9.84990 

 0.30762 

 0.30325 



0.46077 

 0.23038 

 9.54970 

 9.78008 



9.78000 

 9.42831 



9.20831 



9.84967 

 0.30802 

 0.30276 



0.46045 

 0.23022 

 9.54970 

 9.77992 



.60256 



H = .16155 



* Note whether north end up or down. 



