UPDATE II: Bob Westerman shared a few cage photos he's found during his research:



UPDATE: Dan tracked down this detailed explanation of the Squirrel Cage: http://weaponews.com/weapons/16209-a-system-for-increasing-the-patency-of-the-squirrel-cage-usa.html

The November 9, 1948, issue of the Evening Star ran a short article on the Squirrel Cage. A February 1949 issue of Mechanix Magazine ran the same photo (and it's more clear).
The Evening Star photo and caption:

The Modern Mechanix photo and caption:




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