C. Determination of Azimuth. 



Observer : Lieutenant Scott-Hansen. 



The hours are counted from the same noon as in the preceding observations. The meas- 

 urement of azimuth having usually been made in combination with the determination of local 

 time, the comparisons between the watch and chronometer Hohwil are not given in the following 

 list, except in the few cases when they are not to be found in List A or B. 



The position of the ocular is given only when noted in the original. 



The two columns headed "Horizontal Circle" correspond to the readings of the two micro- 

 scopes (or verniers) in the same manner as for the vertical circle in List A. 



The striding level of the horizontal axis of the great instrument was always read off in 

 its two positions, but here only the sum of the numbers is given, the two ends of the bubble 

 being indicated, as in the original, by N, S or E, W. The difference between these numbers 

 will then give the inclination of the axis in seconds of arc. 



In the column headed "Object", C indicates the mark in the magnetic observatory. As 

 stated in the introduction, the purpose of these observations was to furnish a line of reference 

 for the determination of magnetic declination. The results, as far as the astronomical part of 

 the work is concerned, are therefore here given at once in the column headed A, which is the 

 azimuth of the celestial object, counted from north through east, and corrected for the inclination 

 of the axis. The direction of the star being given by this number, the sign of the inclination 

 of the axis, as given by the level, is easily found. 



In some few cases the small altazimuth has been used for these observations. 



The following list also contains some determinations of azimuth made directly with the 

 magnetic theodolite which was provided, for this purpose, with a mirror, placed before the object 

 glass of the horizontal telescope, and moveable about a horizontal axis; the position of its axis 

 is indicated by M. r. or M. t. (mirror right, or turned) which, in order to save room, is inserted 

 in the column "Level". The mirror could be used with the celestial object in front or behind. 

 When the object was sufficiently low, the telescope could be used without the mirror. As a 

 check on the stability of the instrument, the telescope was also in this case, before and after 

 the observations, pointed to a terrestrial mark, here called m, which gives a sufficient indication 

 of the use of this instrument. While the observations of the magnet could be made without 

 the telescope, this was always used for the celestial object and the terrestrial mark. 



Preceding and following limb are indicated by P. L. and F. L. 



