PHOTOGRAPH OF THE GREAT SPOT ON THE SUN. 

 laken at the Koval Obserratorv, Greenwich, on tlie 13th Febniarr, 1S92, :it Oh. I7ni. ISs. The Sim'-- :ixi- i< ii!:u-eiJ vertiCallv on tlie paLr.r with fin- Y.nth 



Pole nppenuost. The wire^ are ] . I per|jendieul.ir t ' ' 





K-^ 



LARGE i-HOTOGRAPH OF A SUNSPOT Of MAXIMUM TYPE. 

 Taken bv Dr. Jri.ES .T.\XSSEN', on the 1st .June. ISSl. 



