Hindu Arabic Numerals

0825-12-01 00:00:00 Decimal place-value notation from India appears in Persian mathematician al-Khwarizmi’s book on mathematical algorithms. Source:http://www.nps.gov/chis/learn/historyculture/arlington.htm For Testing Purposes only: Chronometric Index: 178000 Make sure to rewrite each slide, include citation and remove this testing paragraph

Invention of The Compass

1040-12-01 00:00:00 There are allusions in the manuscript Wu Ching Tsung Yao, written in 1040, to “an iron fish” suspended in water that pointed to the south. Source:http://theinstitute.ieee.org/technology-focus/technology-history/a-history-of-the-magnetic-compass For Testing Purposes only: Chronometric Index: 179001 Make sure to rewrite each slide, include citation and remove this testing paragraph

Invention of Gunpowder

0850-12-01 00:00:00 Chinese scientists had been playing with saltpeter — a common name for the powerful oxidizing agent potassium nitrate — in medical compounds for centuries when one industrious individual thought to mix it with sulfur and charcoal. The result was a mysterious powder from which, observers remarked in a text dated from the mid-9th… Continue reading Invention of Gunpowder

The telegraph

1889-12-01 00:00:00 Samuel Morse developed the telegraph between the 1830-40’s. The telegraph worked by transmitting electrical signals over a wire laid between stations Source:http://www.history.com/topics/inventions/telegraph For Testing Purposes only: Chronometric Index: 223001 Make sure to rewrite each slide, include citation and remove this testing paragraph