Hour Glasses or Sandglasses
Motion and Time of Class 7
Sandglasses are more accurate then candle and water clock. Simple technology is used for this clock as sand is poured in glass materials , due to gravity sand reached from one device to another device as shown in figure.The timing was 14th century when it was develop . Originally, sandglasses were used as a measure for periods of time .
- Introduction
- Measuring time by the Sun the Moon and the Stars
- Oil Lamps
- Candle Clocks
- Water Clocks
- Hour Glasses or Sandglasses
- The Merkhet
- Why 24 hours in a day
- Quartz Clocks
- Cesium Atomic Clock
- Modern Time Keeping
- Motion
- Translation motion
- Rotational motion
- Rectilinear motion
- Curvilinear motion
- Oscillatory/Vibratory motion
- Vibratory motion
- Random motion
- Accelerating Motion & Falling
- Distance & Displacement
- Acceleration
- solved questions
- Exercise-1
