Testimonial Letter

U.S. DEPARTMENT OF COMMERCE

National Bureau of Standards

Dear Jim:

Congratulations on an outstanding piece of work. How much will five or ten more like it cost? We were surprised by the way atmospheric pressure holds the two cones together. Obviously we must provide a small clearance between the two cones, increasing toward the large end. It would be a good if there were some clever way of doing this in the manufacturing process. Perhaps the inner cone could be pressurized enough to increase its diameter by 2 or 3 mils at the large end while the outer cone is being wound on it. This would provide an almost ideal clearance profile. For a few days I am unfortunately occupied with another project, but hope and crave to get on with putting the refrigerator together soon.

Sincerely,

James E. Zimmerman
Cryoelectronic Metrology Group-724.03
Electromagnetic Technology Division

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