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.
1 Season with salt and pepper. 2  Add the onion, carrots, and parsnips and cook gently alongside the meat for a few minutes. 3  Stir in the water. 4  Cover and bring to a boil before turning the heat down to low. 5  Simmer for 1 hour or longer, depending on the cut of meat you used and if it is tender yet.very Irish household has their own version of this famous dish-so here's mine. I like to add chunky pieces of parsnip for a little sweetness, and fresh rosemary gives it a distinct flavour and aroma. If you use a tougher cut of meat, you can leave it to simmer longer before adding the potatoes.