Sandwich

Sandwich tern. While screwdrivers are designed for the above functions, they are commonly also used as improvised substitutes for pry bars, levers, and hole punches, as well as other tools. Not every style can be used with every filling. Other patterns of security screws are less common, though sets of security heads are, again, readily available. Sandwiches vary greatly both in their style—how they are put together—and their fillings. TORX is one such pattern that has become very widespread, with suitable screwdrivers widely available in electronics stores. The ham sandwich theorem can be used to prove mathematically that a single cut can divide two pieces of bread and the filling each exactly in half. Many modern electrical appliances, if they use screws at all, use screws with heads of non-standard shape in an attempt to prevent users of the device from easily disassembling them— see the article on screws for details.

The sandwich theorem, frequently used in calculus and real analysis, states that if a real-valued function (the filling) lies everywhere between two other real-valued functions (the bread) which both converge to the same limit, then the "middle function" also converges to that limit. Since a variety of drill bits are available in this format, it allows the tool to do double duty as a push drill. Eating a sandwich with cutlery arguably defeats the purpose of this specific snack food. Companies such as Lara now offer a modernized version that uses standard 1/4-inch hex shank power tool bits. However, the generally recognised way to eat a sandwich is with one's hands. Once very popular, these spiral ratchet drivers, using proprietary bits, have been largely discontinued by manufacturers such as Stanley, although one can still find them at vintage tool auctions. In some countries it is considered proper to always use cutlery to eat sandwiches. The ratchet can be set to rotate left or right with each push, or can be locked so that the tool can be used like a conventional screwdriver.

Nowadays some types of sandwich are too unwieldy to be held in one hand, thus defeating Montagu's original purpose, and must be eaten with a knife and fork, or at least with both hands. The user pushes the handle toward the workpiece, causing a pawl in a spiral groove to rotate the shank and the removable bit. The name of the earldom comes from that of the English town of Sandwich in Kent—from the Old English Sandwic, meaning "sand place". Manual screw drivers with a spiral ratchet mechanism to turn pressure (linear motion) into rotational motion also exist, and predate electric screwdrivers. It is said that Lord Sandwich was fond of this form of food because it allowed him to continue playing cards at cribbage while eating, because he did not want to get his cards sticky, from eating meat with his bare hands.
. Indeed a form of sandwich is attributed to the ancient Jewish sage Hillel the Elder, who is said to have put meat from the Paschal lamb and bitter herbs inside matzo (or flat bread) during Passover. Some drills can also be fitted with screwdriver heads.

The sandwich was named after John Montagu, 4th Earl of Sandwich, an 18th-century English aristocrat, although it is unlikely to have been invented by him. This kind of design has allowed the development of electrically powered screwdrivers, which, as the name suggests, use an electric motor to rotate the bit. Comedian Dane Cook, as part of one of his comedy bits, uses the pronunciation sangwich, most likely for gag value. Many screwdriver designs have a handle with detachable head (the part of the screwdriver which engages with the screw), called bits, allowing a set of one handle and several heads to be used for a variety of screw sizes and types. Blue Collar member Larry The Cable Guy uses the pronunciation sammich in one of his bits in Blue Collar Comedy Tour: The Movie. Some manual screwdrivers have a ratchet action whereby the screwdriver blade is locked to the handle for clockwise rotation, but uncoupled for counterclockwise rotation when set for tightening screws; and vice versa for loosening. In the U.S., some children, and a few adults, pronounce the word sandwich as sammich, either out of difficulty pronouncing the word, or as a form of baby talk or stereotyped child's speech. When tightening a screw with force, it is important to press the head hard into the screw, again to avoid damaging the screw.

In South Africa sandwiches are sometimes called 'sarmies'. This is less important for PoziDriv and SupaDriv, which are designed specifically to be more tolerant of size mismatch. One Australian slang term for sandwich is 'sanger' (or 'sanga'). It is important to use a screwdriver that is the right size and type for the screw used, or it is likely that the screw will be damaged in the process of tightening it. In Scotland, sandwiches are called 'pieces'. Screwdrivers come in a large variety of sizes to match those of screws, from tiny jeweler's screwdrivers up. In French countries one might see this referred to as un Belge: a Belgian (sandwich). There are many types of screw heads, of which the most common are the slotted, Phillips, PoziDriv, Robertson, SupaDriv (crosspoint), TORX, and Allen (hex).

In Britain roughly 1.8 billion sandwiches are purchased outside the home every year. A screw has a head with a contour such that an appropriate screwdriver tip can be engaged in it in such a way that the application of sufficient torque to the screwdriver will cause the screw to rotate. A sandwich filled with chips (US: french fries) is known as a 'chip butty'. Screwdrivers are made in a variety of shapes, and the tip can be rotated manually or by an electric or other motor. This is particularly the case with sandwiches including freshly-cooked bacon and butter, though other forms of 'butty' use other ingredients and mayonnaise. The handle and shaft allow the screwdriver to be positioned and supported and, when rotated manually, to apply torque. In the UK, particularly in the north of England they are known, informally, as 'butties' or 'sarnies'. A typical hand screwdriver comprises an approximately cylindrical handle of a size and shape to be held by a human hand, and an axial shaft fixed to the handle, the tip of which is shaped to fit a particular type of screw.

In India, sandwiches are often vegetarian, the most common type being the vegetable sandwich. The screwdriver comprises a head or tip which engages with a screw, a mechanism to apply torque by rotating the tip, and some way to position and support the screwdriver. In Norway, there is also an ice-cream called Sandwich, consisting of two square cookies with vanilla ice-cream in the middle. A screwdriver is a device specifically designed to insert and tighten, or to loosen and remove, screws. This open-face variation is also prevalent in Russia, where it is known as a buterbrod (бутерброд, from the German word for "buttered bread"). as a topping, although the sandwich with two slices of bread has become more commonplace in recent times.

a single slice of bread with meat, fish, cheese, etc. The nearest traditional Scandinavian equivalent is generally known elsewhere as an "open" or "open-face" sandwich, i.e. Thus hamburgers and "subs", for example, are called "sandwiches" in the United States, although not in the midwest, south or western states or most other English-speaking countries (since they are not made with slices of bread from a loaf). The term "sandwich" has been expanded—especially in the United States—to include items made with other types of bread, such as rolls and focaccia.

As part of a full meal sandwiches are traditionally accompanied with such side dishes as a serving of soup (soup-and-sandwich), a salad (salad-and-sandwich), or potato chips and a pickle or coleslaw. They are also served in many restaurants as entrées, and are sometimes eaten at home, either as a quick meal or as part of a larger meal. Sandwiches are commonly carried to work or school in lunchboxes or brown paper bags (in sandwich bags) to be eaten as the midday meal, taken on picnics, hiking trips, or other outings. The bread is often either lightly buttered, covered in a flavoured oil when baked, or oil is added into the sandwich to enhance flavour and texture.

A sandwich is a food item typically consisting of two pieces of bread between which are laid one or more layers of meat, vegetable, cheese, or other fillings, together with optional or traditionally provided condiments, sauces, and other accompaniments. Vegetable sandwich. Vegemite sandwich. Turkey.

Tuna salad. Tuna. Steak. SPAM - fried, with mayo or Miracle Whip.

Shawarma. Shrimp. Roast beef. Reuben.

Potato chip sandwich, classic American "White trash" or "Trailer park trash" cuisine. Pork. Nutella and other chocolate spreads. Peanut butter and jelly sandwich.

Muffuletta. Monte Cristo sandwich. Jam sandwich. Hot dog or other sausages.

Hot brown. Whopper of Burger King. Big Mac of McDonald's. Hamburger or other ground meat patties, e.g.: