Mod 1-2 AB, MS, NC, NM, AL

By diehmstudents
  • Jan 1, 1300

    The Clock (Continued)

    The Clock (Continued)
    Month and day unknown. By Andrew Lingafelter During the 1600's the metallic gear, or toothed wheel, and the use of the screw in assembling the clocks were first used.
  • Jan 1, 1300

    The Clock

    The Clock
    Month and day are unknown. By Andrew Lingafelter The first mechanical clock was invented in the early 1300's. With this invention time began to be measured in hours (24 hours equaling a day). Galileo, an Italian scientist, discovered the pendulum in 1581. The pendulum greatly improved the constant movement of the hands or bell of a clock. The average error with the pendulum varied only by seconds each day. Before this the error was from 10 to 15 minutes a day.
  • Period: Jan 1, 1400 to

    Mod 1-2 AB, MS, NC, NM, AL

  • Jan 1, 1578

    The Submarine

    The Submarine
    Month and day are unknown. By Andrew Lingafelter The first underwater warship was developed by Leonardo da Vinci. da Vinci kept his plans secret because he didn't want to make war any more terrifying than it already was. In 1578 William Borne began drawing plans for a submarine. His submarine was never built. Borne's submarine worked by using extra tanks which could be filled so the submarine would submerge. The tanks would be emptied for the submarine to surface.
  • Jan 1, 1578

    The Submarine (Continued)

    The Submarine (Continued)
    Month and day are unknown. By Andrew Lingafelter In 1620 Cornelis Drebbel, a Dutch inventor,
    built a leather covered rowboat with oars. The
    oars came out through watertight seals. Twelve
    people could ride in the submarine. Drebbel
    was an engineer who worked for the British
    navy. Drebbel was the first to discuss the problem of air replenishment while the submarine submerged. Drebbel's submarine could only go down about fifteen feet. It could stay underwater for a couple of hours.