The quantity of water used, added (+) to the volume of the grist.
Their sum (z) multiplied (×) by the heat required, less (-) the heat of the air.
This produce divided (÷) by the heat of boiling water (212) less (-) the heat of the air will quote how much is to be made to boil or brought through (212) that is how high the copper is to be charged, the remainder of the length of the whole liquor for this mash, is the quantity to be cooled in.
The first example is that of a brewing of small beer, when the heat of the air is at 60, (see page 232.) The volume of the 6 quarters of malt was estimated at 3,42 barrels, (see page 268;) the first liquor is 14½ barrels, (see page 247) and the heat required for the first mash 154 degrees, (see page 247.)
First Mash.
| m = | 14,50 | Barrels of water |
| n = | 3,42 | Volume of grist |
| —— | ||
| m + n = | 17,92 | c = 154 Heat of the first mash, |
| 94 | b = 60 Heat of the air, | |
| —— | —— | |
| (a) heat of | c - b = 94 | |
| boiling water, 212 | 7168 | |
| b heat of the air, 60 | 16128 | |
| —— | —— | |
| a - b = 152 | )168448 | (1108 barrels of water, tobe made to boil out of the 14 + 1/2 barrels whichare allotted for the first mash. The incidents to be mentioned, are not considered in this calculation. |
| 152 | ||
| —— | ||
| 164 | ||
| 152 | ||
| —— | ||
| 1248 | ||
| 1216 | ||
| —— |
The next example of a brewing is that of a grist of eleven quarters of malt for porter or brown beer; the medium heat of the air is forty degrees, the volume of the grist, 6,32 barrels, (see page 268) the first liquor to mash with sixteen barrels, (see page 245) and the heat expected in the mash, one hundred and fifty-seven and a half[29] degrees. (See page 245).
First Mash of brown strong beer.
| 16,00 | Barrels of water | |
| 6,32 | Volume of malt | |
| —— | 157 Heat required in the | |
| 22,32 | mash, vide page 247. | |
| 117 | 40 Heat of the air. | |
| —— | —— | |
| Heat of boiling | 15624 | 117 |
| water, 212 | 2232 | —— |
| Heat of air, 40 | 2232 | |
| —— | —— | |
| 172 | )261144 | (15,18 barrels of water, to be |
| 172 | made to boil out of the | |
| —— | 16 barrels. | |
| 891 | ||
| 860 | ||
| —— | ||
| 314 | ||
| 1324 | ||
| —— |