However, once an operator had learned to type at speed, the bars attached to letters that lay close together on the keyboard became entangled with one another, forcing the typist to manually unstick the type bars, and also frequently blotting the document.
A business associate of Sholes, James Densmore, suggested splitting up keys for letters commonly used together to speed up typing by preventing common pairs of type bars from striking the plate at the same time and sticking together. The effect that this rearrangement of letters had on maximum typing speed is a disputed issue. Some sources say that the QWERTY layout was designed to slow down typing speed to further reduce jamming, while other sources assert the rearrangement worked by separating common sequences of letters in English.
Therefore, the hammers that were likely to be used in quick succession were less likely to interfere with each other. QWERTY also attempted to alternate keys between hands, allowing one hand to move into position while the other hand strikes a key.
This sped up both the original double-handed hunt-and-peck technique and the later touch typing technique. An unfortunate consequence of the layout, for right-handed typists, is that many more words can be spelled using only the left hand. This would seem to explain why the keys aren't in an intuitive order, such as alphabetically, and why three of the vowels are annoyingly squashed up in the top line.
By the time typewriters that could cope with higher speeds, and indeed desktop computers, had been invented, the QWERTY set-up had become the convention, and secretarial schools were making a lot of money out of its inherent difficulty. Although, of course, the alphabet itself is merely a convention Louise, Sheffield UK I found the following answer by simply typing your question into google.
It seems to cover most bases. So why you didn't try that is anyones guess. It is also called the "Universal" keyboard for rather obvious reasons.
It was the work of inventor C. Sholes, who put together the prototypes of the first commercial typewriter in a Milwaukee machine shop back in the 's. For years, popular writers have accused Sholes of deliberately arranging his keyboard to slow down fast typists who would otherwise jam up his sluggish machine. In fact, his motives were just the opposite. When Sholes built his first model in , the keys were arranged alphabetically in two rows.
At the time, Milwaukee was a backwoods town. The crude machine shop tools available there could hardly produce a finely-honed instrument that worked with precision. Yes, the first typewriter was sluggish. Yes, it did clash and jam when someone tried to type with it. But Sholes was able to figure out a way around the problem simply by rearranging the letters. Looking inside his early machine, we can see how he did it. The first typewriter had its letters on the end of rods called "typebars.
The roller which held the paper sat over this circle, and when a key was pressed, a typebar would swing up to hit the paper from underneath. If two typebars were near each other in the circle, they would tend to clash into each other when typed in succession. So, Sholes figured he had to take the most common letter pairs such as "TH" and make sure their typebars hung at safe distances.
He did this using a study of letter-pair frequency prepared by educator Amos Densmore, brother of James Densmore, who was Sholes' chief financial backer. The QWERTY keyboard itself was determined by the existing mechanical linkages of the typebars inside the machine to the keys on the outside.
Sholes' solution did not eliminate the problem completely, but it was greatly reduced. The keyboard arrangement was considered important enough to be included on Sholes' patent granted in see drawing , some years after the machine was into production. QWERTY's effect, by reducing those annoying clashes, was to speed up typing rather than slow it down. Sholes and Densmore went to Remington, the arms manufacturer, to have their machines mass-produced.
In , the first Type-Writer appeared on the market. No contemporary account complains about the illogical keyboard. That is to say, the lesson of the QWERTY story remains the resilience of a design created for an outmoded technology's dictates.
But the development of the design wasn't accidental or silly: it was complex, evolutionary, and quite sensible for Morse operators. Keyboard configurations are newly important as we think about how we should type on tablets and other devices.
The calling card of the personal computer was the keyboard, and now, we are carrying around pieces of glass on which we simulate the old QWERTY design. Are we going to keep that layout going? But if not, how might a new design develop? Whatever the reason for the QWERTY layout, it seems pretty unlikely that one of the first keyboard layouts invented would be perfect.
The Dvorak keyboard layout tries to minimize the distance traveled by the fingers. It also tries to make the typist alternate hands on consecutive letters as often as possible. The Dvorak layout places all of the most commonly used letters in the home row so your fingers don't have to move at all to hit these keys.
The left hand has all of the vowels and some consonants and the right hand has only consonants. So there are very few words in the English language that can be typed with only one hand on the Dvorak keyboard two are "papaya" and "opaque". This site shows the layout of the Dvorak keyboard.
0コメント