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space bar
The space bar, spacebar, blank, or space key,〔(【引用サイトリンク】url=http://www.merriam-webster.com/dictionary/space%20key )〕 is a key on a typewriter or alphanumeric keyboard in the form of a horizontal bar in the lowermost row, significantly wider than other keys. Its main purpose is to conveniently enter a space, e.g., between words during typing.
A typical space bar key is very large, enough so that a thumb from either hand can use it, and is almost always found on the bottom row of standard keyboard layouts.
==History==
Originally (on early typewriters dating back to the late 19th century) the "bar" was literally that, a metal bar running across the full width of the keyboard (or even wider, and even surrounding it) that triggered the carriage advance without also firing any of the typebars towards the platen. Later examples gradually shrank and developed into their current more ergonomic form as a wide, centrally located but otherwise apparently normal "key", as typewriter (and computer) keyboards began to incorporate additional function keys and were more deliberately "styled". Although it varies by keyboard type, the space bar usually lies between the Alt keys (or Command keys on Macintosh keyboards) and below the letter keys: C, V, B, N and M on a standard QWERTY keyboard.
Some early typewriter and particularly computer keyboards used a different method of inserting spaces, typically a smaller, less distinct "space" key which was also often set in a less central position, e.g. the Hansen Writing Ball, Hammond typewriters or the Sinclair ZX Spectrum and Jupiter Ace ranges. The earliest known example, Sholes and Glidden typewriter used a lever to provide space between words, placing the invention of the inset spacebar after 1843. However these methods were also usually just one part of similarly idiosyncratic full keyboard layouts, designed more to cope with particular technical requirements or limitations than with any sense of user friendliness and as such met with limited success, sometimes being dropped even on later models in the same line (e.g. Sinclair Spectrum 128k and "Plus" lines, which adopted more "normally styled" keyboards with plastic keytops and a wide, central spacebar in place of the earlier rubber "chiclet" keys and small, offset space key).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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