United Kingdom
Richardson publishes on the saccharometer
John Richardson applies the hydrometer to wort and publishes the tables that turn a reading into a decision — showing brewers that brown malt was poor value.
1784 · also called saccharometer, hydrometer brewing, Statical Estimates, gravity brewing
The version you have probably heard
“Richardson invented the hydrometer.”
Hydrometers long predate him. What is his is the application to wort, the name saccharometer, and the tables — and the tables are the part that mattered and the part nobody remembers.
Richardson’s *Statical Estimates of the Materials of Brewing* set out how to measure the specific gravity of wort and, crucially, supplied the tables that made a reading actionable. Without the tables a number is a curiosity; with them a brewer can compare malts and cost a recipe.
The finding that mattered was that brown malt yields substantially less fermentable extract than pale malt — the opposite of the prevailing assumption. London porter brewers were paying for malt that was not becoming beer.
Why it matters
The measurement that changed British recipes. Gravity became the language of beer strength, brewery accounting and eventually taxation, and porter was reformulated around what the instrument revealed.
How well this is established
| Certainty | Documented. Supported by contemporary records that survive and are agreed on. |
|---|---|
| When | 1784. Known to the year rather than to the day. |
| Where | United Kingdom |
Styles this shaped
Either side of this
← 1780: Pale ale is exported to India · 1784: Steam power reaches the brewery →
See the whole sequence on the beer history timeline.
Last reviewed 2026-08-16.