Ads
related to: clock time practice for kids at homeeducation.com has been visited by 100K+ users in the past month
- 20,000+ Worksheets
Browse by grade or topic to find
the perfect printable worksheet.
- Guided Lessons
Learn new concepts step-by-step
with colorful guided lessons.
- Digital Games
Turn study time into an adventure
with fun challenges & characters.
- Education.com Blog
See what's new on Education.com,
explore classroom ideas, & more.
- 20,000+ Worksheets
Search results
Results from the WOW.Com Content Network
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
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand ) from the upper bulb to the lower one due to gravity .
The primary purpose of a clock is to display the time. Clocks may also have the facility to make a loud alert signal at a specified time, typically to waken a sleeper at a preset time; they are referred to as alarm clocks. The alarm may start at a low volume and become louder, or have the facility to be switched off for a few minutes then resume.
The hourglass is often used as a symbol representing the passage of time Clocks; a watch-maker seated at his workbench. Chronometry [a] or horology [b] (lit. ' the study of time ') is the science studying the measurement of time and timekeeping. [3]
The original design of the rolling ball clock has three main rails – two labeled for minutes and one for hours. The bottom rail represents the hours, the middle rail represents the minutes in multiples of 5 or 10, while the top rail represents single minutes 1 through 4.
Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.
Ads
related to: clock time practice for kids at homeeducation.com has been visited by 100K+ users in the past month