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Electronic time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card
2000 BC: Water clock by at least the old Babylonian period (c. 2000 – c. 1600 BC), [188] but possibly earlier from Mohenjo-Daro in the Indus Valley. [189] 2000 BC: Chariot in Russia and Kazakhstan [190] 2000 BC: Fountain in Lagash, Sumer. 2000 BC: Scissors, in Mesopotamia. [191] 1850 BC: Proto-alphabet (Proto-Sinaitic script) in Egypt. [192]
TRON—The Real-time Operating system Nucleus; TRSDOS—Tandy Radio Shack – Disk Operating System; TSO—Time Sharing Option; TSP—Traveling Salesman Problem; TSR—Terminate and Stay Resident; TTA—True Tap Audio; TTF—TrueType Font; TTL—Transistor—Transistor Logic; TTL—Time To Live; TTS—Text-to-Speech; TTY—Teletype
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On September 14, 2015, 14-year-old Ahmed Mohamed was arrested at MacArthur High School in Irving, Texas, for bringing a disassembled digital clock to school. The incident ignited allegations of racial profiling and Islamophobia from many media sources and commentators. The episode arose when Mohamed reassembled the parts of a digital clock in ...
History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...
Tshai Lun then initiated the idea of making paper from the bark of trees, remnants of hemp, rags of cloth and fishing nets. He submitted the process to the emperor in the first year of Yuan-Hsing (105 CE) and received praise for his ability. From this time, paper has been in use everywhere and is universally called the paper of Marquis Tshai.
Time dilation. Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them ( special relativity ), or a difference in gravitational potential between their locations ( general relativity ). When unspecified, "time dilation" usually refers to the effect due to velocity.