| 1 | A | B | C | D | E | F | G |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | English brewery cask units - Chart |  |  |  |  |  |  |
| 3 | gallon | firkin | kilderkin | barrel | hogshead | - | Year designated |
| 4 | - | - | - | - | 1 | hogsheads | - |
| 5 | - | - | - | 1 | ​1 1⁄2 | barrels | - |
| 6 | - | - | 1 | 2 | 3 | kilderkins | - |
| 7 | - | 1 | 2 | 4 | 6 | firkins | - |
| 8 | 1 | 8 | 16 | 32 | 48 | ale gallons | (1454) |
| 9 | = 4.621 L | = 36.97 L | = 73.94 L | = 147.9 L | = 221.8 L | ale gallons | (1454) |
| 10 | 1 | 9 | 18 | 36 | 54 | beer gallons | (1454) |
| 11 | = 4.621 L | = 41.59 L | = 83.18 L | = 166.4 L | = 249.5 L | beer gallons | (1454) |
| 12 | 1 | ​8 1⁄2 | 17 | 34 | 51 | ale gallons | 1688 |
| 13 | = 4.621 L | = 39.28 L | = 78.56 L | = 157.1 L | = 235.7 L | ale gallons | 1688 |
| 14 | 1 | 9 | 18 | 36 | 54 | ale gallons | 1803 |
| 15 | = 4.621 L | = 41.59 L | = 83.18 L | = 166.4 L | = 249.5 L | ale gallons | 1803 |
| 16 | 1 | 9 | 18 | 36 | 54 | imperial gallons | 1824 |
| 17 | = 4.546 L | = 40.91 L | = 81.83 L | = 163.7 L | = 245.5 L | imperial gallons | 1824 |

Question: How many ale gallons was hogshead defined as in 1688?
Answer: In 1688 the ale hogshead was defined to be 51 ale gallons (235.7 l).