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- Computer mouse (29399 bytes)
1: ...movement.<br>'''3:''' Optical encoding disks include light holes.<br>'''4:''' Infrared LEDs shine thro...
3: ... The underside of the mouse houses a device that detects the mouse's motion relative to the flat surf...
5: ... because the cord on early models resembled the rodent's tail, and also because the motion of the poin...
9: [[Image:firstmouseunderside.jpg|frame|The first computer mouse held by invent...
11: ....com/3543541.html 3541541]. Ball and wheel by ''Rider'', 9/74, [http://www.freepatentsonline.com/38354... - Steam engine (17867 bytes)
3: ...eds a boiler to boil [[water]] to produce steam under pressure. Any [[heat]] source can be used, but t...
6: ... machine sutherland steam fire engine. Image provided by [http://classroomclipart.com Classroom Clip A...
7: The first steam device, the [[aeolipile| ''aeolipile'']], was invent...
9: ... same period. Early industrial steam engines were designed by [[Thomas Savery]] ([[1698]]), [[Thomas N...
11: Early engines worked by the [[vacuum]] of condensing steam, whereas later types (such as [[steam ...
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