And, the last paragraph on page 53 is interesting - especially the last sentence beginning "Up to now . . ." For some reason, viewers cannot access the next page of the document, which evidently would have discussed some long-term experience gained on an airship through tests conducted by Dr. Kroplin. Very intriguing.
"Furthermore, the environmental compatability is an issue. Endurances reached with balloons are from several months up to a year. Certainly the solar UV radiation in the critical wavelengths exceeds ground values by an order of magnitude, even though the low temperature will possibly reduce the decomposition process. Also the gas permeability of films will be reduced by low temperatures. Up to now, no long-term experience has been gained on airship . . .."
The notice for readers on page 54 is as follows:
"You have either reached a page that is unavailable for viewing or reached your viewing limit for this book."
Since page 55, etc. are available for viewing, pg. 54 has been made unavailable. I wonder why? Hmmmm . . . .
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