napier’s bones
![napiers bones napier's bones](http://edinatuition.files.wordpress.com/2012/10/napiers-bones3.jpg?resize=540%2C405)
Yesterday visited Traquair House near Innerleithen. They have a set of Napier’s Bones on display. The above set of calculating aids may have been used by JN himself according to a note in the display case.
Wolfram.com on Napier’s Bones
Wikipedia on Napier’s Bones
Nrich on Napier’s Bones
Also on display was this abacus
![abacus abacus](http://edinatuition.files.wordpress.com/2012/10/photo-3.jpg?resize=540%2C405)