Chapman 14th October 1880 AK mashing scheme

We’ll finish with a look at the mashing scheme.

It’s a rather complicated one. With no fewer than seven operations.

Things kick off with an infusion. Followed by an underlet. All pretty standard stuff. Then there’s something simply described as “O” in the brewing record. My guess is that it means “overlet”. That is, adding hot water to the top of the mash, rather than the bottom, as in an underlet.

There’s then the first sparge, which is followed by a second mash. Which is somewhat warmer than the first. Though the strike heat is lower. The process ended with more sparging.

As there are no column headers for the mashing details, it’s impossible to know whether the rightmost temperatures are initial heats or tap heats. I’m inclined to believe the latter. For all, except the initial infusion mash.

Chapman 14th October 1880 AK mashing scheme
operation	barrels	strike heat	initial heat	tap heat
mash 1	10	168º F	143º F
underlet	1	173º F
overlet	1	173º F
sparge 1	9	176º F		150.5º F
mash 2	3	160º F		150º F
sparge 2	4.5	164º F		158.5º F
sparge 3	4.5	161º F		160º F
Source:
Chapman brewing record.