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The Calculagraph is a device which mechanically calculates and prints the elapsed time between two events. Their best known, earliest use was as a means of tracking of table usage in pool halls. Later, until the advent of the digital era, they became the standard way to clock the duration of toll telephone calls. [1]
A table of hours is shown for a sequence of seven days, with the day of the week indicated both for the sunrise (hour 1) and the sunset (hour 13) naming conventions. Day hours are calculated by adding up the amount of minutes from sunrise and sunset, then dividing by 12.
Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system.
The equation of time is obtained from a published table, or a graph. For dates in the past such tables are produced from historical measurements, or by calculation; for future dates, of course, tables can only be calculated. In devices such as computer-controlled heliostats the computer is often programmed to calculate the equation of time.
Mean time between failures (MTBF) describes the expected time between two failures for a repairable system. For example, three identical systems starting to function properly at time 0 are working until all of them fail. The first system fails after 100 hours, the second after 120 hours and the third after 130 hours.
the first calculator to have a controlled carry mechanism that allowed for an effective propagation of multiple carries [32] the first calculator to be used in an office (his father's to compute taxes) the first calculator commercialized (with around twenty machines built) [5] the first calculator to be patented (royal privilege of 1649) [33]
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Interval scheduling is a class of problems in computer science, particularly in the area of algorithm design. The problems consider a set of tasks. Each task is represented by an interval describing the time in which it needs to be processed by some machine (or, equivalently, scheduled on some resource).