After racking my frickin' brain for 2 days now, (with apologies to Dr. Richard Kimble) "And I just found a big piece!!!!!"
Look down this page at the 3 photographs of Nap Lajoie:
http://www.baseball-fever.com/showth...l-Photographs&
In the bottom most picture, if you follow his right hand into the distance you see the pole (or smokestack) and the dark rooflike structure seen in the Cobb photograph. It doesn't say what stadium this is, but now we have a lot more info.