Chapter 7 TimeLine By EmilyStewart0714 Period: 1612 to 1612 Thermometer Page 199 Period: 1620 to 1620 Slide Rules Page 203 Period: 1642 to 1642 Calculator Page 204 Period: 1863 to 1863 Blackboard Page 186 Period: 1936 to 1936 Computers Page 188 Period: 1938 to 1938 Printers Page 203 Period: 1960 to 1960 Word Processing Page 195 Period: 1980 to 1980 Microcomputers Page 188 Period: 1980 to 1989 Geometric Sketchpad Page 203 Period: 1991 to 1991 Web Camera Page 198 Period: 1997 to 1997 Virtual School Page 205 Period: 1999 to 1999 Digital Libraies Page 201 Period: 2000 to 2000 Spreadsheets Page 191 Period: 2005 to 2005 Powerpoint Page 196 Period: 2008 to 2008 Clicker Page 197