Recommended
More Related Content
What's hot
What's hot (20)
Similar to Advancement of Clocks and Time Telling
Similar to Advancement of Clocks and Time Telling (20)
Recently uploaded
Advancement of Clocks and Time Telling
- 1. The Evolution of Time Telling Clocks
- 2. Prehistoric man: Phases of the moon Observation of the stars The Big Dipper and the North Star Sunrise, sunset Changes in the seasons
- 3. What is a second? 300 BC: sexagesimal division 16th century: seconds on clocks 1952: ephemeris seconds 1955: caesium seconds 9,192,631,770 Hz
- 4. Coordinated Universal Time (UTC) International Atomic Time (TAI) Atomic clocks deviate only 1 second in about 20 million years. Universal Time (UT1) Also known as astronomical time, refers to the Earth's rotation.
- 5. Time Zones Region on earth that has a uniform standard time 40 time zones on land Earliest and latest time zones are 26 hours apart Any given calendar date exists at some point on the globe for 50 hours
- 7. Past: Sundial From the 2nd millennium BC. The length and position of a shadow cast by a vertical stick caused by the movement of the sun through the sky. It is an estimate of time because it is not accurate due to the variation of the sun’s path during the seasons.
- 8. 1400-1000 B.C Water Clocks (Clepsydra): 1400 BC Egypt Measures time by the amount of water that drips from a tank. Candle Clocks 1000 B.C As the candle burned it would pass a marker which indicated a certain length of time. First alarm clock
- 9. 6th Century Incense Clocks First used in China Weights tied with threads were attached to incense sticks at every interval as the stick would burn out the weight drops into a metal pan making a sound
- 10. 13th - 14th Century European Clocks (mechanical Clocks): 13th-14th century First clocks in European cathedrals did not have faces and were made to “chime” hourly. Foliot = Primitive version of the pendulum used to regulate the oscillation of the timing bar
- 11. 16th-17th Century Pendulum Clocks 16th Rolling Ball Clocks 17th Century
- 12. Present The Quartz (Analog Clock) Invented Jan.1 1927 by Warren Marrison and J.W. Horton Works by having a battery send electric currents to cause a vibration Most common type of clock used for time keeping
- 13. Present The Atomic Clock Invented Jan. 1 1949 from production of many scientists in England Uses electromagnetic waves to track the time Used in business & science due to how accurate it is
- 14. Future of Clocks: Year 2154 Timex and Core 77 Design Competition Commemorate 150 years of crafting and time keeping TX54 designed by David Tackas (USA)
- 16. Timex Whisper Joseph Ribic (USA)
- 17. Sticker Watch Alexey Koptev (Russia)
- 18. Conclusion Time regulates our daily lives To accurately communicate with people all over the world Farming, social structures, communication, and business
Editor's Notes
- Necessary for planning nomadic activity, farming, sacred feasts, etc. Find the Big Dipper and the North Star. Now consider the North Star as the center of a clock and draw an imaginary line from the North Star through the two pointer stars of the Big Dipper. Consider this as the hour hand of a clock. Now imagine a 24-hour clock, where the hour hand moves counterclockwise – opposite to the hour hand motion of a normal clock. If the pointer hand points straight to the top of the imaginary clock, the time would be midnight. To calculate other times, you will need to do the following calculation Time = Dipper Time – 2 X the number of months since March 6. On March 6, there is no need to do any such calculations. The time on the imaginary dipper clock will be the actual time.
- The International System of Units (SI) defines one second as the time it takes a Cesium-133 atom at the ground state to oscillate exactly 9,192,631,770 times.
- This will be muted. Speaker will speak over it and present it as an overview of our presentation.
- The water clock is the oldest (and possibly simplest) known timekeeping device, dating back to 16th century B.C. Babylon. These clocks used the steady flow of water to keep track of time. A large bowl or container would be filled with water and allowed to slowly drain from a spout on the bottom. The inside of the bowl was marked with the times, and you could determine how much time had passed by the water level in the bowl. You could also place a second bowl beneath the spout and measure the amount of water that accumulated. However, the design had one major issue: the water flowed more slowly as the bowl emptied. This was the result of a decrease in pressure as the weight of the water in the bowl decreased. Toward the end, the water barely trickled and no longer kept accurate time. Candle clocks take advantage of a simple concept: the slow and consistent nature of a burning wax candle. By utilizing this process, our ancestors were able to keep steady track of the time. The clocks were created by engraving the length of the candle with evenly spaced markings. Each marking represented a single unit of time (such as one hour), and as the wax burned down, each hour would melt away. In order to determine how much time had passed since lighting the candle, you just checked the highest remaining marking. Candle clocks could also function as alarm clocks. To use them this way, they inserted a heavy nail into the wax at the desired time mark. When the wax melted that far down, the nail would clatter into a metal tray below.
- In addition to water, mechanical, and candle clocks, incense clocks were used in the Far East, and were fashioned in several different forms. Incense clocks were first used in China around the 6th century; in Japan, one still exists in the Shōsōin. Several types of incense clock have been found, the most common forms include the incense stick and incense seal. An incense stick clock was an incense stick with calibrations; most were elaborate, sometimes having threads, with weights attached, at even intervals. The weights would drop onto a platter or gong below, signifying that a certain amount of time had elapsed. Some incense clocks were held in elegant trays; open-bottomed trays were also used, to allow the weights to be used together with the decorative tray. Sticks of incense with different scents were also used, so that the hours were marked by a change in fragrance. The incense sticks could be straight or spiraled; the spiraled ones were longer, and were therefore intended for long periods of use, and often hung from the roofs of homes and temples.
- The rolling ball clock was invented by 17th century French engineer Nicolas Grollier. This clock kept time using rolling balls on a zigzag track. The path took anywhere from 15 seconds to a full minute for the ball to complete. Once it reached its destination, it tripped a mechanism that both moved hands of the clock forward and reversed the tilt to return the ball to its original position. However, the clock’s main flaw was the cleanliness of the track. When dust accumulated, it slowed the ball down, which resulted in very unreliable timekeeping
- Atomic clocks are the most accurate timekeeping devices known to date. Accurate to within a few seconds over many thousands of years, they are used to calibrate other clocks and timekeeping instruments. The first atomic clock, invented in 1949, is on display at the Smithsonian Institution. It was based on the absorption line in the ammonia molecule, but most are now based on the spin property of the cesium atom. The idea of using atomic transitions to measure time was first suggested in 1879. The practical method for doing this became magnetic resonance, developed in the 1930s. In 1945, Rabi first publicly suggested that atomic beam magnetic resonance might be used as the basis of a clock and finally it came in 1949.
- global design competition organized by Timex in collaboration with Core77. The design competition was held to commemorate 150 years of crafting and time keeping TX54 is a disposable timepiece that is worn on the user’s thumbnail. While its translucency makes it blend seamlessly with the hand, a selection of text color options and a glow feature that activates on command make it easy to read.
- Sublimex is worn on the eye like a contact lens where it periodically flashes the time so quickly that the brain isn’t conscious of how it got the information. The user seems to simply know the time, raising a host of possibilities about how the nature of clockwatching would change.
- Timex Whisper fits in the ear and whispers the time to the user. It also functions as a telephone and baby monitor. Transparent when worn, red when not, this timepiece is almost invisible to the observer and is thus a very private way of tuning in to information.
- Sticker Watches come on a roll, with perforations making it easy to simply tear off a watch and stick it anywhere. A timer, clock, and calendar are included on each sticker. Its ease-of-use and utilitarian appearance embody an informal approach to the future of time.