By Linda Formichelli, W. Eric Martin

Teenagers will study all approximately innovations: their inventors, the best way they replaced heritage, and their evolution over centuries, throughout the actions and anecdotes supplied during this interactive series.

From old civilization's earliest calendars and shadow clocks to the atomic clocks of at the present time, the background of time dimension emerges during this interactive advisor. The learn of the evolution of timekeeping units and the inventors of calendars and clocks is integrated and loaded with attention-grabbing evidence and minutiae. Fifteen hands-on actions aid show humans' altering courting with time over the centuries.

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Additional info for Tools of Timekeeping: A Kid's Guide to the History & Science of Telling Time

Example text

Using the ruler, draw two lines 16 C parallel to line FO. One line will connect the point labeled 9 with G S T the line AB, and the other line will connect the point labeled 3 with the line AB. ) 9 10 11 F 12 2 1 3 R D K L E M N P A 30 O W B PTE1R A12 11 CH 2 10 9 3 8 4 7 6 5 Chapter Two: Here Come the Hours 17 & 18 C 17. U  sing the ruler, draw lines from point O through points N and P G S T until you hit the line going from 3 to point W. These lines are the four and five o’clock lines so mark them Q 4 and 5 on the line going from 3 to 9 10 11 F 12 1 3 L 8 18.

The machine usually has a motorized arm that lifts a ball onto a series of ramps, and the ball rolls until it lands in a space for minutes. When the minutes slot fills up, one falls into a space for hours, and the rest roll to the bottom. Rolling Balls, Launching Rockets Sir William Congreve (1772–1828) is known to horologists for inventing a unique style of rolling ball clock, but the rest of the world knows him as the inventor of the military rocket. The British used his rockets in 1806 against French ships, in 1807 while attacking the city of Copenhagen, and in 1808 during a battle in Spain.

Inside the boat, a piece of pewter holds the incense so that the wood doesn’t burn. A person using this clock places an incense stick flat on the piece of pewter, then lays thin strings over the incense. Each of the strings has a small metal ball tied 54 Whar are the different ways that incense worked as a clock? AP 11 12 C1H 2 10 9 8 4 7 6 5 TER Chapter Four: What Is a Clock Anyway? to each end. As the incense burns, it also burns through the strings, which causes the metal balls to fall into a bowl placed below the clock.

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Tools of Timekeeping: A Kid's Guide to the History & Science of Telling Time by Linda Formichelli, W. Eric Martin


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