Day 260~366

A clock is an instrument to indicate, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning “bell”. A silent instrument missing such a striking mechanism has traditionally been known as a timepiece.In general usage today a “clock” refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one’s person are often distinguished from clocks. The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day, the lunar month, and the year. Devices operating on several physical processes have been used over the millennia. A sundial shows the time by displaying the position of a shadow on a flat surface. There are a range of duration timers, a well-known example being the hourglass. Water clocks, along with the sundials, are possibly the oldest time-measuring instruments. A major advance occurred with the invention of the verge escapement, which made possible the first mechanical clocks around 1300 in Europe, which kept time with oscillating timekeepers like balance wheels. Spring-driven clocks appeared during the 15th century. During the 15th and 16th centuries, clockmaking flourished. The next development in accuracy occurred after 1656 with the invention of the pendulum clock. A major stimulus to improving the accuracy and reliability of clocks was the importance of precise time-keeping for navigation. The electric clock was patented in 1840. The development of electronics in the 20th century led to clocks with no clockwork parts at all.
The timekeeping element in every modern clock is a harmonic oscillator, a physical object (resonator) that vibrates or oscillates repetitively at a precisely constant frequency. This object can be a pendulum, a tuning fork, a quartz crystal, or the vibration of electrons in atoms as they emit microwaves. Analog clocks usually indicate time using angles. Digital clocks display a numeric representation of time. Two numeric display formats are commonly used on digital clocks: 24-hour notation and 12-hour notation. Most digital clocks use electronic mechanisms and LCD, LED, or VFD displays. For convenience, distance, telephony or blindness, auditory clocks present the time as sounds. There are also clocks for the blind that have displays that can be read by using the sense of touch. Some of these are similar to normal analog displays, but are constructed so the hands can be felt without damaging them. The evolution of the technology of clocks continues today.
The study of timekeeping is known as horology.

(info from wiki)

day260w

8 thoughts on “Day 260~366

  1. I would love to see/feel a clock for the blind! I wonder how much use there is for that sort of thing now, with all the gadgets that talk to us (FYI, I just asked Siri what time it was. She told me ‘at the tone, the time will be x’ and proceeded to make a beeping noise herself. Apparently my modern gadget has a sense of humor).

    Liked by 1 person

  2. Nice to see a real clock again. We don’t have one anymore. What with the microwave, cooker, central heating timer, two tablets, a PC, and three mobile phones, we are constantly reminded of the time anyway! Then there’s the EPG on the PVR, telling the time whenever we look to see what’s on, and the digital display in the car too. I wonder why I still bother to wear a watch! At least we don’t have a clock in the toilet…
    Best wishes, Pete.

    Liked by 1 person

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