History of the measurement of mass
par johnny deep
1. picture about history of measurement of mass
1.1. http://www.google.com.hk/imglanding?q=mass&um=1&hl=zh-TW&tbs=isch:1&tbnid=vMger0Qo03U0OM:&imgrefurl=http://www.tutorvista.com/content/science/science-i/atoms-molecules/atom.php&imgurl=http://image.wistatutor.com/content/atoms-molecules/atomic-mass-determination.jpeg&zoom=1&w=430&h=358&iact=hc&ei=ZRXjTJfOLofEvgPjkPWvDg&oei=ABXjTI6iOYy0vgPGupTzDQ&esq=11&page=11&tbnh=135&tbnw=162&start=221&ndsp=21&ved=1t:429,r:1,s:221&biw=1161&bih=733
2. started
2.1. necessary measurement
2.1.1. http://www.historyworld.net/wrldhis/PlainTextHistories.asp?historyid=ac07
2.1.2. Length
2.1.2.1. Egypt
2.1.2.2. Mesopotamia
2.1.3. weight
2.1.4. volume
2.1.4.1. Geistesblitz Tools
2.1.4.2. Email & SMS Gateways
2.1.4.3. Compare Editions
2.1.5. time
2.1.5.1. New node
3. timetable
3.1. Sundial and water clock: from the 2nd millennium BC
3.1.1. Erathosthenes and the camels
3.2. Hero's dioptra: 1st century AD
3.2.1. Hipparchus
3.3. The hour: 14th century AD
3.3.1. clocks
3.4. Minutes and seconds: 14th - 16th century AD
3.4.1. von Guericke
3.5. Barometer and atmospheric pressure: AD 1643-1646
3.5.1. Accademia del Cimento
3.6. Mercury thermometer: AD 1714-1742
3.7. Chronometer: AD 1714-1766
3.8. Sextant: AD 1731-1757
3.8.1. European voyages in the 15th century practical improvements