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42

[[image - sketch of a very large machine more than twice as tall as the man standing beside it in front of an array of pipes, working the controls. 
Lots of pipes and cables connected to two large drum shaped vessels]]

^[[HYDROGEN FURNACE IN BLDG. 8.]]
[[line]]

[[underlined]] To Willie, February 14, 1925: [[/underlined]] This morning I inquired about the large copper crystals because I was very interested and knew that you would be also. It seems that I have been nearer to their place of origin than I realized because they were discovered by accident in our hydrogen furnaces and then developed in the laboratory after the clue was found. It seems that they had been having trouble with the copper in some way and in order to ascertain this trouble, had some pieces of copper wire laid side by side in a porcelain tray, covered with sand, and run through the brazing cycle of the big furnace, which cycle