A mercury switch (also known as a mercury tilt switch) is a switch which opens and closes an electrical circuit through a small amount of liquid mercury.Contents.he envelope may also contain air, an inert gas, or a vacuum. Gravity is constantly pulling the drop of mercury to the lowest point in the envelope. When the switch is tilted in the appropriate direction, the mercury touches a set of contacts, thus completing the electrical circuit through those contacts.
Irish stew is the product of a culinary tradition that relied almost exclusively on cooking over an open fire. It seems that Irish stew was recognized as early as about 1800.
Which raises the question: What was Irish food like for the 1500 years between Patrick and potatoes? The short answer is: milky. Every account of what Irish people ate, from the pre-Christian Celts up through the 16th-century anti-British freedom fighters, revolves around dairy. The island's green pastures gave rise to a culture that was fiercely proud of its cows (one of the main genres of Ancient Irish epics is entirely about violent cattle rustling), and a cuisine that revolved around banbidh, or white foods.