258 Ocean Magnetic Observations, 1905-16 



nnits in this decimal place. It is thus to be understood that no claim is made for the 

 ^ect^esf of thelst figure; it has been retained here primarily m_ order that when all 

 eTucilrns toco,Lon ep^ch have been applied on account of the various magnetic varia- 

 tions the error of computation will be kept withm the desned hinit. 

 tions the error 01 c^ p ^^^^^^^ ^^ ^^^ horizontal intensity exclusively, or values 



of toTal irnsi" was decided in the previous volumes, for the practical reasons there 



''^1Cl:Z:l:^^e shown m the columns "Compass" ^^^^^■;^^^ 

 HPsWnations of the various instruments employed will be found stated on pages 2Ud ^11. 

 xSr -'Cln^^^^^ also includes the "Sea Deflector" -JJ^^f \\«^^tt^^^^^^ 



mras^emert of the total intensity. The designation 189.9,10,7. nieanstha^^^^^^^^^ 

 was observed with sea dip-chcle 189, using regular dip needles 9 and 10 and detiectea 

 ledle 7 Ind That furthermore, total intensity was obtained by the deflection method, 

 usLi intens^^^^ and 8 Invariably the intensity needles are itahcized and are 



S la r Sie hther number of the two intensity needles always designates the chief 

 Slensity needle (thfdefl and the loaded needle) . Whenever the total intensity was 



deterr^ed from both loaded^dip observations and deflections, this fact is shown by the 

 adS of th? dagger (f); thvfs, e. g., 189.9,10,7St. By turning to the specimens of 

 oSHtil! pages1l2-£5^ any additional explanation requked may be obtained. 



The columns of "Remarks" contam: „ r ^ ^rW.nU ih^ nhsprvationa 



a Course —This is the ship's magnetic course (headmg) on which the observations 



were made men the word "suing" occurs, this means that the vessel was swung dur ng 



observations to t'st occasionally the absence of deviation corrections For all swings the 



tal mertimes glen in the respective columns denote the times of begimiing and ending 



"' %r^! Carnegie, because of the absence of deviation corrections it was also poss^^^^ 



to make observations when the vessel's heading was shiftmg, as would be the case when 



tlip vpssel was "becalmed" or "at anchor." „ j r „ „;j^ 



rSozI-This column records the full angle through which the ship rolled, from side 



^'^ ^'c.^'sea.— The state of the sea is mdicated by the followmg symbols: 



B. Broken or L-regular sea. H. Heavy sea. • g^^^^^'^ 



g: &*er ■ °' ""^ "'^ M. \!o!:rT.%!:or sweU. T. TMe rips. 



Sometimes the combinations of symbols in the observers' [^f^J^s denoti^^^^^^ 

 of the sea aDoear incongruous. In these cases one particular letter was selected, alter a 

 teM conXaLTof Sl^the symbols given by the various observers, supplemented by 

 the recorded ship's roll and by other notes. . 



d. Weather.-The symbols denoting the state of the weather at the time are those m 



general use : 



b. Clear, blue sky. ^ Li?hUung. «• Snow.^^^ 



c. Clouds. ^- ^X^^^^i-^t u Uelv appearances, threatening 

 d Drizzling or light rain. o. Overcast. "• ^^'> f^^. 



/ Fog or foggy leather, P- Passmg showers. ^ VaTfable ;;eather. 



g. Gloomy, dark. Stormy. 9- ^<l'f^"J ' ^ Wet or heavy dew. 



h. Hail. >"• ^^^- 2. Hazy weather. 



Weights.-T^e figures given in the column marked " Wt " are tt;^ ^igi^^^^^^^^^^^ 

 results on the following scale, which expresses, m a general way, the conditions Isea ana 

 ZtL) under which the obB;rvations were made: 1 denotes severe or adverse conditions, 

 2 medium, and 3 favorable conditions. 



