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.
A rich beef stew with a backbone of stout. [Photograph: Vicky Wasik] Irish beef stew made with Guinness is a pub classic, but the truth is that Guinness loses a lot of its already-mild roasted flavor during the time it takes to cook a stew. This version fixes that by reinforcing the beer's flavors.