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Napier's bones is a manually operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication , and also called rabdology , a word invented by Napier.
The first device, which by then was already popularly used and known as Napier's bones, was a set of rods inscribed with the multiplication table. Napier coined the word rabdology (from Greek ῥάβδος [rhabdos], rod and λόγoς [logos] calculation or reckoning) to describe this technique. The rods were used to multiply, divide and even ...
Napier's Bones. His work Mirifici Logarithmorum Canonis Descriptio (1614) contained fifty-seven pages of explanatory matter and ninety pages of tables listing the natural logarithms of trigonometric functions. [10]: Ch. III The book also has a discussion of theorems in spherical trigonometry, usually known as Napier's Rules of Circular Parts.
Home Town star Erin Napier‘s daughter Helen is recovering after having her leg rebroken by doctors following a frightening accident earlier this month. Take That! Celeb Moms Clap Back at ...
The device is a variant of Napier's bones. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations .
Mae Napier's name was an Easter egg on the TV show This Is Us.. Erin Napier told her followers on Instagram that her newborn daughter's name, Mae, was shown during NBC's This Is Us during a scene ...
Helping a fellow HGTV star! Joanna Gaines and Chip Gaines sent Erin Napier’s 3-year-old daughter, Helen, a handwritten note after she broke her leg on the playground. Chip and Joanna Gaines ...
The promptuary, also known as the card abacus is a calculating machine invented by the 16th-century Scottish mathematician John Napier and described in his book Rabdologiae [1] in which he also described Napier's bones. It is an extension of Napier's Bones, using two sets of rods to achieve multi-digit multiplication without the need to write ...