Si Unit Collection

Nikola Tesla, Serb-US physicist
Nikola Tesla (1856-1943), Serb-US physicist and electrical engineer. Tesla was educated at Graz and Prague, but in 1884 he emigrated to the USA

Kelvin thermometer, artwork C017 / 3608
Kelvin thermometer. Computer artwork of a thermometer with its scale marked in degrees kelvin (K). The kelvin is a unit of measurement for temperature

Primary standard radiation force balance C016 / 6477
Primary standard radiation force balance. Radiation force balances are used to measure the output power generated by transducers, devices that convert one form of energy to another

Wilhelm Weber, German physicist
Wilhelm Eduard Weber (1804-1891), German physicist. Weber spent most of his career as professor of physics at the University of Gottingen from 1831 to 1837, and again from 1849

Interference rings as length standards C016 / 2056
Interference rings as length standards. These Fabry-Perot interferometer observations (40-centimetre path difference) are for the green line of mercury-198 (left)

Bank of Weston cells C016 / 2041
Bank of Weston cells. These electrochemical cells produce a stable voltage used as a standard to calibrate voltmeters and define the SI unit for electromotive force (the volt)

Ayrton-Jones ampere balance C016 / 2034
Ayrton-Jones ampere balance. This apparatus is used to measure a standard value for the ampere, the international (SI) unit of electric current

Nikola Tesla, caricature C015 / 6713
Nikola Tesla (1856-1943). Caricature of the Serb-US physicist and electrical engineer Nikola Tesla. Tesla was educated at Graz and Prague, but in 1884 he emigrated to the USA

Werner Siemens, German engineer
Werner Siemens (1816-1892), German electrical engineer. His full name was Ernst Werner Siemens. He was born in Lenthe, Hanover, Germany

Andre-Marie Ampere, French physicist
Andre-Marie Ampere (1775-1836), French physicist and pioneer of electrodynamics. Ampere also worked as a mathematician and chemist. He was elected to the French Academy of Sciences in 1814

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"Unveiling the Legacy of SI Unit: A Journey through the Minds of Visionaries" Step into the world of scientific pioneers as we explore the fascinating history behind the SI unit. One such luminary is Nikola Tesla, a Serb-US physicist whose groundbreaking work revolutionized our understanding of electricity and magnetism. In this captivating journey, we encounter remarkable inventions like the Kelvin thermometer, an ingenious device that measures temperature with unparalleled accuracy. Marvel at artwork C017 / 3608, which beautifully captures the essence of this remarkable instrument. Delving deeper into precision measurement, we discover the Primary Standard Radiation Force Balance C016 / 6478 - a true marvel in its ability to accurately quantify radiation forces. Its counterparts, C016 / 6479 and C016 / 6477, further exemplify humanity's quest for precise standards. The contributions continue as we learn about Wilhelm Weber, a German physicist who paved the way for modern electrical measurements. Witness awe-inspiring interference rings as length standards (C016 / 2056) that showcase Weber's ingenuity in establishing reliable benchmarks. Bank of Weston cells (C016 / 2041) and Ayrton-Jones ampere balance (C016 / 2034) take center stage next – two extraordinary creations instrumental in defining electrical units with utmost precision. These innovations demonstrate how meticulous engineering has shaped our understanding of fundamental quantities. Returning to Tesla's brilliance, his caricature (C015/6713) reminds us not only of his immense contributions but also his unique persona that captivated generations worldwide. Finally, let us pay homage to Werner Siemens – a German engineer whose name echoes throughout scientific circles even today. His pioneering efforts have left an indelible mark on metrology and engineering alike; truly a testament to human ingenuity. As we conclude this enlightening journey through time and innovation surrounding SI units' development, may it inspire future generations to push boundaries and unravel the mysteries of our universe.