MAGNETIC OBSERVATIONS 



309 



When observing with two needles the observations with first polarity of the first needle 

 were immediately followed by the complete determination with the second needle (polarities of 

 both needles being reversed at the same time), after which observations with the second polarity 

 of the first needle were made. By this arrangement the final means from each needle correspond 

 to practically the same epoch of time. As will be noted from the above specimen, two settings 

 were made on each end of the needle in every position except in those cases where these differed 

 by ten minutes or more of arc, when an additional observation was made and the mean of the 

 three readings taken. 



Rbsui^ts 



Only the final results for eagh needle and their means are shown in the tabulation following, 

 the mean values being adopted without correction (see page 12). The time is the mean of 

 the times noted at beginning and end, and is expressed in local mean time, reckoned from 

 midnight throughout the twenty-four hours. The observer is indicated by the initials (see 

 page 17). 



Tabular summary of observations of magnetic inclination at Teplitz Bay 



