In the early 20th century, when the process of alcoholic fermentation was fully understood, important scholars, both Italian and foreign, rationally applied it to production processes, refining distillation plants.
Thus was born the modern distillation industry and with it, the commercial and fiscal need to accurately measure the alcohol content of spirits.
In this context, a particularly noteworthy mention goes to Enrico Comboni (1850-1900), founder and first director of the Chemistry Laboratory at the Enological Institute of Conegliano. He perfected the steam distillation technique remarkably and structured the still so that the grape pomace placed inside the boiler would be crossed by a flow of steam, carrying with it aromas and alcoholic substances. This method, although with various subsequent modifications, was of paramount importance considering that today, more than 90% of Grappa produced is steam distilled.