Anemometer constant torque and responded more quickly to gusts than the four-cup anemometer. The three-cup anemometer was further modified by the Australian Dr. Derek Weston in 1991 to measure both wind direction and wind speed. Weston added a tag to one cup, which causes the cupwheel speed to increase and decrease as the tag moves alternately with and against the wind. Wind direction is calculated from these cyclical changes in cupwheel speed, while wind speed is determined from the average cupwheel speed. Three-cup anemometers are currently used as the industry standard for wind resource assessment studies & practice. One of the
Alcoholic spirits measure used in Scotland and Northern Ireland. The landlord can chose one or the other but not both. Thimble measures are also used in 175ml and 250ml volumes for measuring wine. Although government stamped for the correct volume, the thimble measure does rely on the user measuring the wine out manually into the thimble. Alcoholic spirits measure Alcoholic spirits measures are instruments designed to measure exact amounts or shots of alcoholic spirits. The most common products used today to measure spirits are the thimble measure and the non-drip measure, often referred to as an optic. The terms "Optic", "Optic Pearl", "OpticJade"