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James A. Van Allen journal, December 1954-October 1955

Page 80

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From N.R.L. 300 - 5678 Electron Tubes 480.00 12 - 6199 Photomultiplier Tubes 487.00 20 - Yardley HR-10 Silvercels 612  ̄ ̄ ̄ ̄ $1579 10 June 1955 Hugh Anderson tried one of the new types 1B85's in the cold chamber and found that it worked properly down to -30 degrees Celsius. Missert, Anderson and Webber are planning to leave over the weekend for Minneapolis to fly the following {but canceled due to unreadiness}: (a) Missert's Ion Chamber (b) A three fold G.M. tube for star monitoring. [Sketch of G.M. Tube] Also my transition experiment (c) Anderson's zenith angle experiment.
 
Van Allen Papers