This is a very old trick, as is shown in the lamentable complaints of Rulerost and Nick F roth the tapster."
"In Praise of Ale" by W.T. Merchant, 1888, pages 624 - 625.
I keep reading descriptions of this or other being a "solid beer" on beer fora. Is this what they meant? It always struck me as weird, describing a liquid as "solid".