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Replies: 16 / Views: 1,541 |
Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Valued Member
United States
82 Posts |
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Thanks for posting the early space flight covers - I'm enjoying the show!
A question: Do you have a sense of how soon after the various launch dates the cachets were added?
The Explorer I cover, for example, lists "Scientific Data Supplied by Satellite Leads to Discovery of the Van Allen Radiation Belts." This did not happen immediately, it took the analysis of lots of data from the satellite before the belts could be confirmed so it makes me curious re: the timing of the cachet.
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Valued Member
United States
160 Posts |
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I cannot say for sure on the green cachet cover.Now for the black and white cover it appears that the text could have been added at a later date once the Van Allen Belts where confirmed?
Kristian Birkeland, Carl Størmer, and Nicholas Christofilos had investigated the possibility of trapped charged particles before the Space Age. Explorer 1 and Explorer 3 confirmed the existence of the belt in early 1958 under James Van Allen at the University of Iowa. The trapped radiation was first mapped by Explorer 4, Pioneer 3 and Luna 1. |
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Valued Member
United States
160 Posts |
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Ok so here is an example of Sarzin's light weight metal cachet design affixed to the envelope. I do not know when he started this practice,but I like it. Also included is a Robert Rank (Space Voyage Covers)version of the same type.   |
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Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Valued Member
United States
36 Posts |
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Valued Member
United States
160 Posts |
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Why thanks ,I am merely the curator of my fathers collection, whom was a savvy collector,editor for a philatelic news letter ................ I just want to display the fruits of his labor for enjoyment due to his connection with the space program and mine.
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Valued Member
United States
160 Posts |
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Valued Member
United States
160 Posts |
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Pillar Of The Community
Australia
916 Posts |
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Pillar Of The Community
United States
1525 Posts |
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Just now seeing this. Great space covers! Those may be the first ones I've seen from the 1950s. I wish others would post their early ones. |
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Replies: 16 / Views: 1,541 |
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