at the total solar Eclipse in 1882 



339 



phases of the eclipse was not originally contemplated, yet 

 the results are full of interest. 



The observations were made on the i6th, i/th and i8th 

 May. The sun's declination at apparent noon was 19 8', 

 19 22' and 19 35' on these days respectively. We take the 

 mean declination for the period as I922 / N. 



The latitude of the station being 2637'N. the mean 

 meridian altitude of the sun was 82 45'= 8275. Table I 

 gives the sun's altitude and azimuth at noon and at every 

 half-hour on each side of noon until sunset. These data were 

 obtained graphically by measurements on the globe. It will 

 be seen that when the sun is more than one hour from the 

 meridian its altitude changes at the rate of about 6'5 in half 

 an hour. When the altitude has fallen to 45 about 3^ hours 

 from noon, the water of the boiler has begun to invade the 

 glass steam dome owing to the inclination which it is neces- 

 sary to give the instrument in order to keep it pointed towards 

 the sun. This does not prevent the instrument acting perfectly 

 well, as will be seen, in Table III, from the observations made 

 on the afternoons of the i/th and i8th, but it is necessary to 

 watch the operation very closely. Moreover, the principal 

 object of the observations is to find the maximum distilling 

 effect of the sun, and this is not likely to occur when it is 

 more than three hours either before or after noon. The 

 period during which, if possible, continuous observations 

 should be made is from 9 a.m. to 3 p.m. 



TABLE I. 



