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.
Irish food is undeniably dominated by the potato. It is the main focus of most meals and potato-only dishes are perhaps Ireland's most famous culinary exports. Colcannon is creamy mashed potatoes mixed with curly kale or cabbage. It is often eaten with roast meat dishes and accompaniment to casseroles.