A grant is a small wort collection vessel, open to the air, placed between the lautering vessel (where the barley-sugar solution, or wort, is strained from the mash) and the wort kettle. The traditional purpose of a grant was threefold: (a) to avoid a potential vacuum in the lauter or mash tun ... thus creating turbid worts or stuck mashes; (b) to allow the brewer to assess wort clarity and wort flow; and (c) to determine whether all parts of the grain bed flow sufficiently well.
—Oxford Companion to Beer
Now, that's 'craft brewing.' And, beautiful to behold, at ...
Anchor Brewing Company
San Francisco, California.