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Ancient Roman units of length Roman unit English name Equal to Metric equivalent Imperial equivalent Notes digitus: finger: 1 ⁄ 16 pes 18.5 mm 0.728 in 0.0607 ft uncia pollex inch thumb 1 ⁄ 12 pes 24.6 mm 0.971 in 0.0809 ft palmus (minor) palm 1 ⁄ 4 pes 74 mm 0.243 ft palmus maior: palm length (lit."greater palm") 3 ⁄ 4 pes 222 mm
The uncia (plural: unciae, lit. "a twelfth") was a Roman unit of length, weight, and volume.It survived as the Byzantine liquid ounce (Ancient Greek: οὐγγία, oungía) and the origin of the English inch, ounce, and fluid ounce.
The name "groma" came to Latin from the Greek gnoma via the Etruscan language.It is unclear which of the many meanings of the Ancient Greek: γνώμων gnomon (cf. Liddell & Scott, [4] "gnoma" is a form) was used, although in multiple sources the Greek term is used to designate the central point of a camp or town.
Prior to the Roman state's adoption of the Varronian chronology – created by Titus Pomponius Atticus and Marcus Terentius Varro – there were many different dates posited for when the city was founded.
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Thomas Fuller (1710 – December 1790), also known as "Negro Demus" and the "Virginia Calculator", was an enslaved African renowned for his mathematical abilities. [ 1 ] History
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]
A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.