Gallon (Winchester) bushel, originally a cylindrical measure of inches in diameter and 8 inches in depth. That made the dry gallon . The bushel, which like dry quart and pint still sees some use, was later defined to be 2150.42 cubic inches exactly, making its gallon exactly (). In previous centuries, there had been a corn gallon of around 271 to 272 cubic inches. The "wine", "fluid", or "liquid gallon" has been the standard US gallon since the early 19th century. The wine gallon, which some sources relate to the volume occupied by eight medieval merchant pounds of wine, was at
Gallon "ale gallon" known as the "imperial gallon" and abolished all other gallons in favour of it. Inspired by the kilogram-litre relationship, the imperial gallon was based on the volume of 10 pounds of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of . In 1963, this definition was refined as the space occupied by 10 pounds of distilled water of density weighed in air of density against weights of density (the original "brass" was refined as the density of brass alloys vary depending on metallurgical composition). This