The essential part of the metric system is decimal numbers, with only one base unit and the multiples created on the decimal base. The first advocate for the use of decimal numbers for everyday purposes was Simon Stevin that wrote De Thiende in 1585. It is worth noting that the Indians have used decimal numbers for mathematical computations long before Simon Stevin. The notation for decimal fractions, developed by Simon Stevin was clumsy but was upgraded with the introduction of the decimal point which can be attributed to Bartholomaeus Pitiscus who used this notation in 1595 for his trigonometrical tables. In 1670 the proposal was published by Gabriel Mouton which is similar to the Wilkins proposal except that the base unit of length was 1/1000 of a minute of arc of geographical latitude which is about 1.852 \(\left[m\right]\). The base unit was named virga while other units of length in that system were combinations of series of names that had prefixes- similar to prefixes in the SI unit system. In 1790, the report was submitted to United States Congress by Thomas Jefferson in which he proposed the adoption of a decimal system and weights and measures. With the base unit foot.
From ancient times up to the adoption of the SI unit system, many countries have developed their unit system that consisted of length, area, capacity, and weight units. In some unit systems, two different capacity units were used i.e. one type of capacity unit was used for liquids while other types of capacity units were used for dry materials. In Western and Southern Europe the following unit systems that were used are:
From ancient times up to the adoption of the SI unit system, many countries have developed their unit system that consisted of length, area, capacity, and weight units. In some unit systems, two different capacity units were used i.e. one type of capacity unit was used for liquids while other types of capacity units were used for dry materials. In Western and Southern Europe the following unit systems that were used are:
- Old French Unit System - In France, before the French Revolution of 1789, the old measures derived from the system of Charlemagne. The problem of this unit system was that units varied from one region to another, subdivisions were irregular and also suffered from regional variations. This regional variations generated complications in business transactions. In 1812 the old weights and measures used before French Revolution were resotred by the French Emperor Napoleon bonaparte. The Law of July 4th, 1837 reinstated the metric system, making it obligatory in France from January 1st, 1840, and banning the use of other weights and measures from that date.
- Old Belgian Unit System - The old Belgian unit system was developed from French and German unit systems. The unit system was in use until 1820 when metric system became compulsory. However, the metric system was intially adopted in 1816.
- Old Swiss Unit System - the unit system that was in use until 1877 when metric system became compulsory. However, the metric system was initially adopted in 1868.
- Old Scottish Unit System - The unit system was in use in Scotland before the adoption of Imperial Weights and Measures act of 1824.
- Old Irish Unit System - The Irish measures were in use in Irealnd before the adoption of Imeprial Weighs and Measures Act of 1824.
- Old Italian Unit System - The Italian unit system was in use before the adoption of the metric system. The definition of units in this system varies geographically, and some units changed over the years. The metric system became compulsory in Italy in 1861, but it was adopted in Milan as early as 1803.
- Old Spanish (Castillian) Unit System - The system was in use until metric system became compuslory in 1860.
- Old Portuguese Unit System - the old portugese unit system was in use until 1872 when metric system became compulsory.
- Old Maltese Units Converter
- Old Balearic Unit System Converter
- Old Greek Unit System Converter
- Old Turkish Unit System - The Turkish system was in use untile 1933 when metric system became compulsory. However, the metric system was adopted in 1869.
- Old Austrian System - The Austrian unit system was developed using Prussioan and German unit systems. It was in use until 1876 when metric system became compuslory. However, the metric system was adopted in 1871.
- Old German (Prussian) System - The system wwas in use until 1872 when metric system beame compulsory.
- Old Czechoslovakian System - the unit system was in use util 1876 when metric system became compulsory. Hwoever, the metric system was adopted in 1871.
- Old Hungarian System - the old Hungarian unit system was in use untile 1876 when metric system became compulsory. However, the metric system was adopted in 1874.
- Old Romanian System - the old Romanian unit system was in use until 1884 when metric system became compulsory. However, the matric system was adopted in 1864.
- Old Dutch System - the system was in use until 1820 when metric system became compulsory.
- Old Danish System - the unit system was in use until 1912 when metric system became compulsory. However, the metric system was adopted in 1907.
- Old Polish System - the unit system was in use until 1919 when metric system became compulsory.
- Old Swedish System - the unit system was in use until 1889 when metric system became compulsory.
- Old Norwegian System - the unit system was in use unitl 1882 when metric system became compulsory. Although, the metric system was initially adopted in 1875.
- Old Finnish System - the system was in use unitl 1892 when metric system became compulsory. However, the metric system was adopted in 1886.
- Old Icelandic System - the unit system is similar to Danish system and was in use until 1907 when metric system was adopted and became compulsory.
- Old Estonian System
- Old Lativan System
- Old Russian System - the unit system was in use before 1917 Revolution and are now obsolete. They can still be found in 19th century Russian literature. The metric system was adopted as the national standard by Soviet government in 1927.
- Old Moroccan Units Converter - the old Moroccan unit system was in use until 1923 when metric system became compulsory.
- Old Tunisian Units Converter - The old Tunisian unit system was in use until 1895 when metric system became compulsory.
- Old Libyan Units Converter - the old Libyan unit system was in use until 1927 when the metric system became compulsory.
- Old Egyptian Units Converter - the old Egyptian unit system was in use until 1891 when the metric system became compulsory.
- Old Abyssinian Units Converter
- Old Eritrean Units Converter
- Old Ethiopian Units Converter - the old Ethiopian unit system was in use until 1963 when the metric system became compulsory.
- Old Somalian Units Converter - the old Somalian system was in use until 1972 when metric system became compuslory. However, the metric system was initially adopted in 1950.
- Old Guinean Units Converter - the old Guinean unit system was in use until 1906 when the metric system became compulsory.
- Old Saudi-Arabian Units Converter - The old Saudi-Arabian unit system was in use until 1964 when the metric system became compulsory. However, the metric system was intially adopted in 1962.
- Old Persian Units Converter - The old Persian unit system was in use until 1949 when the metric system became compulsory. However, the metric system was intially adopted in 1933.
- Old Syrian Units Converter - The old Syrian unit system was in use untile 1931 when the metric system was adopted.
- Old Turkmenian Units Converter
- Old Indian Units Converter - The old Indian unit system was in use until 1956 when metric system became compulsory. However, the metric system was intially adopted in 1920.
- Old Burmese Units Converter
- Old Ceylonese and Madrasian Units Converter
- Old Annamese Units Converter
- Old Cambodian Units Converter - The old Cambodian unit system was in use until 1914 when metric system became compulsory.
- Old Thai Units Converter - The old Thai unit system was until 1936 when metric system became compulsory. However the metric system was intially adopted in 1923.
- Old Indonesian Units Converter - The old Indonesian unit system was in use until 1938 when metric system became compulsory. However, the metric system was initially adopted in 1923.
- Old Philippine Units Converter - The old Philippine unit system was in use unitl 1975 when metric system became compulsory. However, the metric system was initially adopted in 1906.
- Old Japanese Units Converter
- Old Cuban Units Converter - The old Cuban unit system was in use until 1960 when metric system became compulsory. However, the metric system was initially adopted in 1882.
- Old Haitian Units Converter - The old Haitian unit system was in use until 1922 when metric system became compulsory. The unit system was derived from both French and Spanish unit systems. It should be noted that the metric system was initially adopted in 1920.
- Old Honduran, Costa-Rican, Nicaraguan, Salvadoran, and Guatemalan Unit System - In these five central American states the metric system became compulsory in 1912. However, the metric system was initially adopted in 1910. The old unit systemin these five central American states was derived from Spanish Castillain system.
- Old Venezuelan Unit System - The old Venezuelan unit system was in use until 1914 when metric system became compulsory. The unit system was derived from Spanish (Castillian) unit system. It should be noted that the metric system was initially adopted in 1857.
- Old Colombian Unit System - The old Colombian unit system was in use until 1854 when metric system became compulsory. However, the metric system was orignailly introduced in 1853. The system was derived from Spanish (Castillian) unit system.
- Old Brazilian Unit System - The Brazilian unit system was in use until 1874 when metric system became compulsory. However, the metric system was originally introduced in 1862.
- Old Paraguayan Unit System - The old Paraguayan unit system was in use until 1889 when metric system was initially introduced and became compulsory.
- Old Argentinian Unit System - The old Argentinian unti system was derived from Spanish (Castillian) unit system and was in use until 1887 when metric system became compulsory. However, the metric system was originally introduced in 1863.
- Old Chilean Unit System - The old Chilean unit system was in use until 1865 when metric system became compulsory. However, the metric system was initailly adopted in 1848.
- Old Peruvian Unit System - The Peruvian unit system was derived from Spanish (Castillian) unit system and was used until 1869 when metric system became compulsory. However, the metric system was initially adopted in 1862.
- Old Mexican Unit System - The old Mexican unit system was in use until 1896 when metric system became compulsory. However, the metric system was initially adopted in 1857.
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