Specimen Magnetic Observations and Computations 

 Computation of Declination Observations with Marine Collimating-Compass Cl 



215 



Dale: Sat., Aug. 23, 1913, P. M. 



Scale constants: S, +0?37; scale alt., -0?I7; 

 scale val., 0?98; N, +180?31; scale alt., 

 +0?35; scale val., 0?99; Z = +0.453 c.o.s 



(Form 26) 



Lai 



39° 44' N 

 Vessel: Carnegie 

 Ohs'r: P. and S. 

 Sun's Bed' n: +11?45 



Long: 39° 50' W 

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

 Comv'r: C. C. C. 

 Reviser: W. J. P. 



Ocean Magnetic Observations: Declination (D) 



(Form 21a) 



Station: At sea f a'- f9° '^' ^ . 



Dale: Sat., Aug. 23, 1913, P. M. Vessel: Carnegie_ 

 Compass: Defl'r 4 (D4) 

 Weather: be Sea: S 



Obs'rs: C. and H. 

 Wind: SSW, 2 



Long: 39° 50' W 

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

 Rec'd'rs: H. and C. 

 Roll: 4° 8. to 4° p. 



Num- 

 ber 



1 

 2 

 3 



4 

 5 

 6 

 7 

 8 

 9 

 10 



Means 



Set I 



Course NNE 



Time by 

 Chron. 256 



TO 



18 



30 



Card 

 Reading 



CourseNNE 



Set II 



Time by 

 Chron. 256 



9 18 49 



9 18 40 305.83 



306. 

 5. 

 6. 

 6, 

 5 

 5 

 5 



6.0 

 5.4 

 5.3 



h m s 

 9 18 51 



19 11 



9 19 01 305.67 



Card 

 Reading 



306.1 

 5.2 



5.7 



6.0 



5.5 



5 



5 



5 



5 



5 



Remarks 



Magnetic articles removed: Yes 



CHRONOMETER COMPARISONS 



Before After 



Set III 



Num- 

 ber 



Course NNE 



10 



Means 



Time by 

 Chron. 256 



h m s 

 9 19 13 



9 19 35 



9 19 24 



CourseNNE 



Card 

 Reading 



305.5 



5.3 



305.48 



Set IV 



Time by 

 Chron. 256 



h m s 

 9 19 37 



19 57 



9 19 47 305.37 



Card 

 Reading 



305.7 



5.7 



Chron. 53862 

 Corr'n on 



G. M. T.' 

 G. M.T. 

 E 



G. A. T. 

 Long. 

 L A T. 

 Chron. 256 



Chron. 256 on 

 L. A. T. 



h in s 



8 49 20 



+ 12 00 41 



20 50 01 



2 32 



20 47 29 



- 2 39 20 



18 08 09 



9 17 18 



+ 8 50 51 



h m s 



9 02 40 



+ 12 00 41 



21 03 21 



2 32 



21 00 49 



- 2 39 20 



18 21 29 



9 30 38 



+8 50 51 



Mean corr'n Chron. 256 on L. A. T. +8''50'^85 



'Adjusted for aea rate. 



