Rockette science

I was most interested in reading the article "Restoring an Icon," in your July issue [page 64]. The mention of the "General Electric Thyratron tube-based dimming system" requires clarification.

This "system" was designed by E.D. Schneider of General Electric Schenectady along with Radio City Music Hall (RCMH) chief electrician Gene Braun. The dimmers were Ward Leonard Company's Hysterset saturable core reactors. The thyratron tubes available at that time (1930) were of low power, and

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