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In the 1970s the National Bureau of Standards (NBS) defined a set of convenient numbers to ease metrication in the United States.This system of metric values was described as 1–2–5 series in reverse, with assigned preferences for those numbers which are multiples of 5, 2, and 1 (plus their powers of 10), excluding linear dimensions above 100 mm. [1]
Comparison of preferred numbers of the 1-2-5, Renard and f-stop series on a logarithmic scale divided into 40 equal intervals (blue) by CMG Lee. Source Own work
Renard series are a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. [1] This set of preferred numbers was proposed ca. 1877 by French army engineer Colonel Charles Renard [ 2 ] [ 3 ] [ 4 ] and reportedly published in an 1886 instruction for captive balloon troops, thus receiving the current name in ...
The E series is a system of preferred numbers (also called preferred values) derived for use in electronic components. It consists of the E3, E6, E12, E24, E48, E96 and E192 series, [1] where the number after the 'E' designates the quantity of logarithmic value "steps" per decade.
A convenient number is a number which in several situations can prove convenient for use by humans for counting and measuring, and is related to preferred numbers (which are standard recommendations used for choosing product dimensions).
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Preferred numbers [ edit ] Ca. 1877 he proposed a now widely used system of preferred numbers known as Renard numbers that was later reportedly published in an 1886 instruction for captive balloon troops, named after him in the 1920s [ 2 ] and finally became international standard ISO 3 .
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