๐”– Bobbio Scriptorium
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Magical numbers and information

โœ Scribed by A. I. Chernyi

Book ID
111494055
Publisher
Allerton Press, Inc.
Year
2009
Weight
123 KB
Volume
43
Category
Article
ISSN
0005-1055

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## CUI~RENT TOPICS. 22I range from I8.9 to I6.2 lumens per watt efficiency. Since the mercury tubes are made of glass, the ultra-violet rays are absorbed and only the visible portion of the mercury vapor spectrum is utilized. C.