Thanks, Sam, great information. Does any example of Ruffs Dale rye whiskey still exist (e.g., in John's incomparable collection)? A simple taste might confirm if it was pot distillation whiskey.
The information about the stills being registered for "whiskey or spirits" is intriguing but only suggestive at best. I come back to gin because the best way to make gin is to batch distill GNS with the botanicals and gin was very popular after Prohibition. I must confess though that this would not require two stills (unless double distillation of the GNS and botanicals was or is common for gin). The presence of scotch-type stills (i.e., wash and spirit stills) would suggest whiskey of some kind was made in them or that the stills had been intended for whiskey manufacture, I certainly agree.
Before WW I malt whiskey in the Irish style was made in America, the Duffy's brand (albeit apparently blended) from Rochester, NY was an example. Maybe in the early years after Prohibition it was thought such manufacture should be revived or might even extend to scotch-style whisky. If this was the plan (as a complement to the mainstay of rye whiskey), the column stills might have been intended to make grain whisky and the pot stills, Scottish-style malt.
I wonder if the 2 books on liquor manufacture referred to in John's page authored by one of the Rosenblooms would shed light on what the family thought a post-Pro distillery should manufacture.
I wonder too if there is any evidence of contemporary Maryland distilleries using pot stills.
By the way the site of the company selling salvage from the warehouse is http://www.oldwoodsale.com
(I had misspelled it in my previous post). If I read the page right, the current owner intends to remove the top floors and the wooden parts of the building.
For a picture of a filled mini of Dillinger straight rye, enter "Dillinger+rye+asahi" in Yahoo and a Japanese mini site comes up showing the bottle (and many others of interest - the site is known to some here). The Dillinger rye bottle bears a green stamp with a distillation or bottling date of 1923 (1923? Yep) and looks genuine. The whiskey is stated as 100 proof. A similar label is reproduced on John's site under his Dillinger Distillery entry but sans bottle (John reproduces another photo which shows different label for Dillinger whiskey affixed in that case to a filled bottle). The photo of the mini is sharp and clear and the whiskey looks mighty good (rich amber and seemingly full-bodied).