5655: Switzerland - Picture Postcards | |||||||||||||||
| Order-# | Michel | Scott | Yvert | SG | ![]() |
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| 930000511 | |||||||||||||||
Description: 1895 Zurich (K1) - Handwritten letter from Swiss astronomer Prof. Rudolf Wolf (1816-93), director of the observatory Zurich, to Prof. Otto Struve, director of the observatory Pulkowa near St. Petersburg, about astronomic news and sun spot observations. In 1849 Wolf introduced the Wolf sun spot number and discovered 1852 the link between sun spots and geomagnetism. | Anbieter: Phila-Live - Christ-Stamps Online Auction 0 bid(s) Start price: 480.00 EUR | ||||||||||||||
| Auction ends at 17.01.2009! | |||||||||||||||
Pictures: ![]() ![]() | |||||||||||||||
Current auction time: Sunday 23rd 2008f November 2008 - 10:43h MET |