# What is John Napier invention?

## What is John Napier invention?

Logarithm
Napier’s bonesPromptuary
John Napier/Inventions

## What was John Napier best known for?

John Napier, Napier also spelled Neper, (born 1550, Merchiston Castle, near Edinburgh, Scot. —died April 4, 1617, Merchiston Castle), Scottish mathematician and theological writer who originated the concept of logarithms as a mathematical device to aid in calculations.

How many rods are in Napier bones?

These slips are written on the surface of ten rods, later on called Napier’s rods (the best sets of Napier’s numbering rods were made of ivory, so that they looked like bones, which explains why they are now known as Napier’s bones).

### When did John Napier invented a calculating device?

In 1614, Edinburgh-born Renaissance scholar John Napier invented logarithms. A means of simplifying complex calculations, they remain one of the most important advances in the study and practical application of mathematics.

### Was John Napier married?

Elizabeth Stirlingm. 1572–1579
John Napier/Spouse

In 1572, Napier married 16-year-old Elizabeth, daughter of James Stirling, the 4th Laird of Keir and of Cadder. They had two children. Elizabeth died in 1579, and Napier then married Agnes Chisholm, with whom he had ten more children.

How old was John Napier when he died?

67 years (1550–1617)
John Napier/Age at death

## Which is the first calculating device?

abacus
An abacus is considered one of the first calculating devices invented by man. It is a manual device which takes time and a great deal of experience to master. An abacus uses several rows of beads to represent numbers; each row stands for a place value and the arrangement of beads in a row stands for a digit.

## Who is the inventor of slide rule?

William Oughtred
Slide rule/Inventors
The slide rule was invented by William Oughtred in the 1600’s, but only began to be widely used in the mid 1800’s after a French artillery officer named Amedee Mannheim developed a version that became popular among engineers. By the early 1900’s engineering students in the US were commonly taught to use slide rules.

Which was the first calculating device?

### What did John Napier contribution to math?

John Napier was a Scottish scholar who is best known for his invention of logarithms, but other mathematical contributions include a mnemonic for formulas used in solving spherical triangles and two formulas known as Napier’s analogies.

### When did John Napier marry Agnes?

Nothing is known of this person except that she is mentioned in a document dated 1595. Agnes. Baptised 18 September 1575. Married (contract dated 14 June and 11 July, 1620) George Drummond of Balloch.

How did John Napier discovered logarithms?

Napier generated numerical entries for a table embodying this relationship. He arranged his table by taking increments of arc θ minute by minute, then listing the sine of each minute of arc, and then its corresponding logarithm.