mouse Variants

Several other experimental pointing-devices developed for Engelbart's oN-Line System (NLS) exploited different body movements – for example, head-mounted devices attached to the chin or nose – but ultimately the mouse won out because of its simplicity and convenience. The first mouse, a bulky device (pictured) used two gear-wheels perpendicular to each other: the rotation of each wheel translated into motion along one axis. Engelbart received patent US3,541,541 on November 17, 1970 for an "X-Y Position Indicator for a Display System".^[7] At the time, Engelbart envisaged that users would hold the mouse continuously in one hand and type on a five-key chord keyset with the other.^[8] The concept was preceded in the 19th century by the telautograph, which also anticipated the fax machine
Just a few weeks before Engelbart released his demo in 1968, a mouse has already been developed and published by the German company Telefunken. Unlike Engelbarts mouse, the Telefunken model had a ball, as it can be seen in most later models until today. Since 1970 it was shipped as a part and sold together with Telefunken Computers. Some models from the year 1972 are still well preserved^[9]
The second marketed integrated mouse – shipped as a part of a computer and intended for personal computer navigation – came with the Xerox 8010 Star Information System in 1981. However, the mouse remained relatively obscure until the appearance of the Apple MacIntosh, including an updated version of the original Lisa Mouse. In 1984 PC columnist John C. Dvorak dismissively commented on the newly-released computer with a mouse: "There is no evidence that people want to use these things".^{[10][11] concats 00923224479031}