![]() Then, starting with the smallest unit of time, convert to larger units of time where possible. One way to add time is to first add each unit of time involved separately. There are a few ways to approach adding time without the use of a calculator, all of which involve using the time conversions listed above. Using this calculator only requires an understanding of some basic units of time and how to convert between each unit: 1 day = 24 hours = 1,440 minutes = 86,400 seconds Use the Date Calculator for calculations concerning dates and to learn more about the Gregorian calendar system. Although the number of days can also be calculated, the calendar system is not a focus of this calculator, since the calculator only measures units of time without reference to dates. This calculator is mainly concerned with time calculations concerning clocks. Time is typically measured using some form of a clock or a calendar clocks are used for periods less than a day while calendars are used for longer periods. To multiply or divide, just provide one time and one factor and click the "Calculate" button. To add or subtract, just provide two times. ![]() There are instructions for the basic use of Comptometer-type machines in the article "Operating a Comptometer" on this site.įor information about the Bell Punch company and its calculators see the article on this site "Anita: the world's first electronic desktopĬalculator - A brief history of the complex Bell Punch company and its calculators".įor a detailed history of the development of the Bell Punch and Anita calculators go to the associated site "Bell Punch Company and the Anita Calculators".Ĭlick here for more information about Comptometers.This time calculator can be used to add, subtract, multiply, and divide time in days, hours, minutes, and seconds. The Casio AL-8 was one of the first electronic hand-held calculators to be able to calculate hours, minutes, and seconds.Įlectronic calculators are available for the television industry which can calculate in hours, minutes, seconds, and frames for various broadcast standards. Time has not been metricated, so there is still the need to calculate in hours and minutes. This machine would have been very useful in the wages department of a company, totalling the hours worked. pressing the 5 key in the right hand column) would produce the result 124 hours 00 The machine in the photographs above and below displays the total of 123 Hours and 55 minutes. ![]() To enter a number above 5 the operator has to press two keys in that column, one after the other, which add up to the number required. When the second column from the right reaches 6, i.e. The keyboard of this machine has keys with, from the left, 7 columns of Hours keys, and 2 columns of Minutes keys.Īlthough from the outside the machine is similar to a normal decimal machine, inside it is geared to carry over in Britain, distributed by Sumlock Ltd., both owned by Control Systems Ltd.).Ģ35 x 182 x 120 mm (9.25" x 7.2" x 4.75"). It has an abbreviated keyboard (keys up to 5) and is designed for calculations in hours and minutes (model Plus 509/T/828599, made by Bell Punch Co. This is a direct action keyboard calculator of the "comptometer" type.
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