user 17085
Landlord.
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Nothing technical about it, but go back to the video from 1973, it implicitly implies that the flat portion adds more to the beer than the high version. The article you posted from Protz states "The two casks in Irish bars were racked one above the other. One contained fresh, lively beer, the other mature beer.", yet the Guinness Times article suggests two identical casts are used "This consists in stillaging two casks of Draught Guinness side by side, and releasing all the pressure from one of them. ".