< li< in'ixtfij a nd rinjxh- 



I mercury unit = 0-94130X109 C. G. S.— Proceeding lln,,„l 



W.'h-Hpse of 1882.— The following collective note of the 

 results obtained was agreed upon by Lockyer, Tacchini and 

 Thollon : " Photographs of the corona and of its complete spec- 



whieh was very near the sun, and a very striking object, was 

 photographed and observed with the naked eye. Brio-lit lines 

 were observed, before and after totality, of different heights, by 

 Lockyer, and with intensities ditferinu' iroin the Fraunhot'er line's 

 by Lockyer and Trepied. An absolute determination of the 



! J.,."...- ... "t dark line'Von' tie 

 corona spectrum was noted by Tacchini and Thollon with very 

 different dispersions. Many bright lines in the violet were 



photographed by Schuster. Hydrogen and coronal lines studied 



liminary notice contained in the Johns Hopkins Imversity 

 [;- fli >'• x '■ »••• ^- -•". i <ul.s ot , ,eu dividing engine. 



obtained, and by means ..f this, diffi action -i'-aiiic_r> with 4M,ooo 

 lines to the incii were obtained. Surfaces Oj-X-4 inches can be 

 ruled by the machine. The screw is practically perfect and has 

 been teste. 1 to , „ ■»„ ,- „- of an inch without showing any apprecia- 

 ble error. A , square with 43,000 lines to the 



13. On th. 



skn, Berlin, Germany.' 

 to call attention to an ii 



