Specimen M.\gnetic Observations and Computations 



219 



Ocean Magnetic Observations: Total Intensity (F by Loaded-Dip Method) 



(Form 28) 



Station: At sea Lat: 39° 29' N 



Date: Sat., Aug. 23, 1913, P. M. Vessel: Carnegie 



Dip circle: D. C. 189 Weather: be Sea: S to M 



iVee(i/e.-81oaded;wt-.,ll Course; NNE Wind: S, 2 



Long: 39° 51' W 

 Com'd'r: W. J. P. 

 Chron'r: 256 

 Roll: 3° 8. to 4° p. 



Obs'r: C. C. C. 

 Rec'd'r: C. W. H. 

 Comp'r: C. W. H. 

 Reitiser: C. C. C. 



End of needle marked A north down 



Circle East 



Circle West 



Circle West 



Circle East 



Needle Face East 



Needle Face West 



Needle Face East 



Needle Face West 



224 to 228 



6 8 



7 8 

 5 6 

 5 7 



226?4 



N 



44 to 48 

 4 6 



4 7 



6 8 



7 8 



312 to 313 



1 4 



2 4 



3 4 

 3 4 



46*30 



46?2 



313?0 



46 



N 



133 to 134 



2 4 



3 4 

 3 5 

 2 4 



314 to 315 

 2 4 



2 4 



3 5 



2 4 



80 



133?4 



313?5 



46 



N 



131 to 136 



1 5 



2 5 

 2 4 

 2 6 



224 to 228 

 5 6 



5 7 



5 8 



7 8 



55 



133 °4 



226 ?3 



N 



46 to 47 

 6 7 

 6 8 

 6 7 

 6 7 



46°55 



Mean/': +46?52 « = /-/' = +18?68 



46?50 



46 '45 



46 ?6 



End of needle marked A north down 



II 



Circle East 



Circle West 



Circle West 



Circle East 



Needle Face East 



Needle Face West 



Needle Face East 



Needle Face West 



224 to 226 

 6 8 



5 6 

 3 6 



6 7 



225?7 



N 



44 to 45 

 5 8 

 7 8 

 5 6 

 4 7 



312 to 313 



2 3 



3 4 

 3 4 

 2 4 



45?80 



45 ?9 



313?0 



46 



N 



131 to 134 



3 5 



4 5 



1 3 



2 4 



312 to 314 

 2 3 



2 5 



4 5 



2 3 



90 



133?2 



313?2 



N 



133 to 135 

 2 3 



2 3 



2 3 



1 3 



227 to 228 

 7 8 



6 7 



6 7 



6 8 



47^05 



132?7 



227 ?0 



46?35 



Mean/': +46?68 « = /-/' = +18?52 



47 



'00 



46 



N 



46 to 47 

 6 7 



6 8 



7 8 

 6 8 



95 



46?9 



Beginning 

 Ending 



Mean 

 L. M. T. 



Set I 



Time 



h 

 5 



m. 

 18 

 21 



5 20 

 14 13 



Magnetic articles removed: Yes 



Temp. 



°C 



28.8 



28.8 



Set II 



Time 



6 



m 

 02 

 04 



6 03 

 14 56 



Temp 



°C 



29.2 

 9.4 



29.3 



Chron'r 53862 



Corr'nonG. M. T. 



G. M. T. 



Long. 



L. M. T. 



No. 256 reads 



No. 256 on L. M. T. 



h m 



4 36.0 

 + 12 00.7 



16 36.7 



- 2 39.4 



13 57.3 



5 03.9 



+ 8 53.4 



Gimbal circle reads: 22 ?5; 202?5 



Computation of H from Deflections 



Distance 



Log CSC Ui 

 Log cos / 



Log Cj at 29?1 C 



LogH 

 H 



Short 



36?48 



0.2258 

 9.6227 

 9.4704 



9.3189 



0.2084 



Long 



25?08 



0.3728 

 9.6227 

 9.3271 



9.3226 



0.2102 



Computation of H from Loaded Dips 



Log CSC u 



Log cos (/'=+46?60) 



Log cos / 



Log C, at 29?0 C. 



Log// 



H 



+ 18?60 



0.2077 



