From:Dan F
Subject:RE: Long Tank vs Short Tank Hendersons Date:Mon Jan 11 18:19:07 2016
Response to:6020

Hello again: Can someone clarify when short tanks appeared and the long tanks were no longer available. I know that long tanks were furnished on the 1922 and 23 Chicago machines, but when did the short tanks first appear? Thanks Mike

You might want to try a search of this sight for a similar question. In addition to Dave's response, I seem to recall another great explanation a year or two back. Of course, I can't find it now.
I think I printed it out. If I can find it, I'll pass it along to you.