1. Technology Timeline 1900 – 2000

2. Ready Put these 10 technologies in order: Past to Present Photocopier PONG Lie Detector HTML Robot Modem Disposable Camera Handheld Calculator Mechanical Television Superheterodyne Radio Circuit

3. Ready Lie Detector An earlier and less successful lie detector or polygraph machine was invented by James Mackenzie. Twenty years later, John Larson, a University of California medical student, invented the modern lie detector (polygraph) and has been used in police interrogation and investigation since.

4. Ready Superheterodyne Radio Circuit Invented by Edwin Howard Armstrong. Today, every radio and television set uses this invention.

5. Ready Mechanical Television John Logie Baird is remembered as being an inventor of a mechanical television system. John Logie Baird and American Clarence W. Hansell patented the idea of using arrays of transparent rods to transmit images for television and facsimiles respectively. Baird's 30 line images were the first demonstrations of television by reflected light rather than back-lit silhouettes.

6. Ready Photocopier The process called Xerography was invented by American law student Chester Carlson. Xerography became commercially available by the Xerox Corporation. Xerography comes from the Greek for "dry writing". Carlson had a hard time finding investors in his new invention. He was turned down by IBM and the U.S. Army Signal Corps, it took him eight years to find an investor, the Haloid Company which later became the Xerox Corporation.

7. Ready Robot An early example of robot technology, Grey Walter's "Machina Speculatrix" was recently restored to its working glory after being lost for some years. Walter's "Machina" were small robots that looked like turtles. The restored cyber turtles are freewheeling and light-seeking creatures, propelled by two small electric motors. They roam in any direction with sensor-contacts to avoid obstacles. A photoelectric cell mounted on the steering column helps the turtles search and aim towards the light.

8. Ready Modem Digital modems developed from the need to transmit data for North American air defense. Modems were used to communicate data over the public switched telephone network or PSTN. The first commercial modem was manufactured - the Bell 103 by AT&T. The Bell 103 was also the first modem with full-duplex transmission, frequency- shift keying or FSK, and had a speed of 300 bits per second or 300 bauds.

9. Ready Handheld Calculator Jerry D. Merryman, who was selected as the project manager, came up with the logic designs for the calculator in three days. Together, Kilby, Merryman, and Van Tassel began work on the calculator. The three filed for a U.S. patent for the world's first handheld calculator. Although the machine did not go into actual production for three years, the prototype had been made. The machine could add, subtract, multiply and divide. There was some automatic decimal placement, and input numbers could be as large as 12 digits. The machine's dimensions were about 4¼ by 6¼ by 1¾ inches and it weighed about 45 ounces.

10. Ready PONG Nolan Bushnell together with Ted Dabney, wrote the first arcade game. It was called Computer Space, based on Steve Russell's earlier game of Spacewar!. The arcade game Pong was written and released by Nolan Bushnell (and programmed by Al Alcorn) a year later. Nolan Bushnell and Ted Dabney started Atari Computers that same year. Three years later, Atari re-released Pong as a home video game.

11. Ready Disposable Camera Fuji introduced the disposable camera. We call them disposables but the people who make these cameras want you to know that they're committed to recycling the parts, a message they've attempted to convey by calling their products "single-use cameras."

12. Ready HTML Vannevar Bush first proposed the basics of hypertext in 1945. Tim Berners-Lee invented the World Wide Web, HTML (hypertext markup language), HTTP (HyperText Transfer Protocol) and URLs (Universal Resource Locators). Tim Berners-Lee was the primary author of html, assisted by his colleagues at CERN, an international scientific organization based in Geneva, Switzerland.

13. Ready Time to put the 10 technologies in order:Past to Present 1902 1918 1925 1937 1940 1958 1967 1972 1986 1990 PONG Photocopier Robot Modem Lie Detector HTML Superheterodyne Radio Circuit Mechanical Television Handheld Calculator Disposable Camera Correct: 10-8: Expert 7-6: Good job 5-4: Okay 3-1: You need ITS 1015