A boilermaker is either of two types of beer cocktail. In American terminology, the drink consists of a glass of beer mixed with a shot of whiskey. In England, the term boilermaker traditionally refers to a half pint of draught mild ale mixed with a half pint of bottled brown ale.
The American cocktail originated in Butte, Montana in the 1890s. It was originally called a Sean O'Farrell and was served only when miners ended their shifts.
When the beer is instead served separately as a chaser, that is often called simply a shot and a beer. In Scotland, the serving of a half pint of beer alongside a "wee hauf" glass of whisky () is called a half and a half.
The English boilermaker (a mix of draught mild and bottled brown ale) is also known as a 'brown split' in the south-west of England, although it also refers to the American shot and pint. The boiler-maker name for the ale cocktail dates back to circa 1920.
There are a number of ways to drink an American beer chaser:
Other pairings of a shot and a beer are possible; traditional pairings include: