By Linda Formichelli, W. Eric Martin
Youngsters will research 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 historic civilization's earliest calendars and shadow clocks to the atomic clocks of this present day, the background of time dimension emerges during this interactive consultant. The learn of the evolution of timekeeping units and the inventors of calendars and clocks is integrated and loaded with fascinating evidence and minutiae. Fifteen hands-on actions aid display humans' altering dating with time over the centuries.
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Extra info for Tools of Timekeeping: A Kid's Guide to the History & Science of Telling Time
Example text
A sextant measures the angle between two objects, and you can make a simple sextant, called a quadrant, that will determine your latitude so that you can build an accurate sundial. 23 Which ancient astronomer set the degrees latitude for the equator and North and South Poles? PTE1R A12 11 CH 2 10 9 3 8 4 7 6 5 Tools of Timekeeping ACTIVITY Finding Your Latitude To make a navigator’s quadrant, you will need: protractor (a tool that helps you draw angles on paper) a a clear straw tape a foot of string a jumbo paper clip or other small object 13 45 5 • • • • • 90 straw lies across the center mark and the 90-degree 45 5 13 Tape the straw to the protractor so that the 0 mark.
Tie a washer to the end of each piece of thread. Place the incense stick in the middle of the loaf pan, and lay the strings across the stick at the intervals you marked with a pen. The washers will hang over either side of the pan, but shouldn’t touch the ground. The strings should be equal distances apart on the incense stick. Place the bread pan on the cookie sheet. Light the incense stick and let it burn for about 30 seconds, then blow it out and let it smolder. If you have a stopwatch function on your watch, start it and keep it running until the first string burns through.
It was a lot of work, but in the end Su Sung created the best clock the world had ever seen. And yet, within a generation, Su Sung’s fabulous creation was pushed into the shadows, ignored by a government official named Wang Fu who wrote a report on astronomical water clocks. Wang Fu belonged to a different government“party”than Su Sung, and by excluding the clock from his report, Wang Fu made Su Sung look less important. Luckily, Su Sung wrote and illustrated a book about his clock, and different copies of the book were discovered in the seventeenth, nineteenth, and twentieth centuries, letting the modern world know about this great achievement of the past.