Iain Petrie | Using an 18th Century Gunter's Rule & original 1626 text to calculate proportions, squares & roots. @IKP1000 | Uploaded June 2022 | Updated October 2024, 10 hours ago.
I'm learning to use my latest acquisition, a super rare Gunter's Rule, also called the Gunter's Navigational Scale, the Gunter's Scale and the Gunter's Line.
Here I follow Gunter's original instructions on how to find proportions, squares of numbers, and cube roots in his 1626 book (2nd edition, I believe, following the original 1624 publication) "The description and use of sector, the cross-staffe, and other instruments."
I then experiment by finding the 4th root of a number using the log scale and the inch scale. In the next few videos I'll explore some of other scales and their uses. on how to find proportions, squares of numbers, and cube roots. I then experiment by finding the 4th root of a number using the log scale and the inch scale. In the next few videos I'll explore some of other scales and their uses.
This is Part 2. See the first part here: youtu.be/mZD7Q1SiC2I
The Rule was invented by Edmund Gunter (1581–1628) in 1623. From the style of the engraving, I believe this example dates from the late 1700s, but if anyone knows better, please let me know in the comments!
"After Briggs popularised Napier's idea of logarithms, Gunter had the brilliant idea of mapping logarithms onto a line in which the linear distance is represented by the logarithm. A simple piece of wood engraved with expertly positioned lines took the sting out of laborious calculations. Initially multiplication and division were completed with the aid of dividers. Gunter's navigational scale was used by the Royal Navy up to the 1840s. Eventually,(1630c)two Günter's scales were juxtaposed to make an even more powerful calculator-the slide rule. " (British Museum. History of the World BBC)
The book can be found online for free here. All 600+ pages!
archive.org/details/descriptionuseof00gunt/page/n8/mode/2up
I'm learning to use my latest acquisition, a super rare Gunter's Rule, also called the Gunter's Navigational Scale, the Gunter's Scale and the Gunter's Line.
Here I follow Gunter's original instructions on how to find proportions, squares of numbers, and cube roots in his 1626 book (2nd edition, I believe, following the original 1624 publication) "The description and use of sector, the cross-staffe, and other instruments."
I then experiment by finding the 4th root of a number using the log scale and the inch scale. In the next few videos I'll explore some of other scales and their uses. on how to find proportions, squares of numbers, and cube roots. I then experiment by finding the 4th root of a number using the log scale and the inch scale. In the next few videos I'll explore some of other scales and their uses.
This is Part 2. See the first part here: youtu.be/mZD7Q1SiC2I
The Rule was invented by Edmund Gunter (1581–1628) in 1623. From the style of the engraving, I believe this example dates from the late 1700s, but if anyone knows better, please let me know in the comments!
"After Briggs popularised Napier's idea of logarithms, Gunter had the brilliant idea of mapping logarithms onto a line in which the linear distance is represented by the logarithm. A simple piece of wood engraved with expertly positioned lines took the sting out of laborious calculations. Initially multiplication and division were completed with the aid of dividers. Gunter's navigational scale was used by the Royal Navy up to the 1840s. Eventually,(1630c)two Günter's scales were juxtaposed to make an even more powerful calculator-the slide rule. " (British Museum. History of the World BBC)
The book can be found online for free here. All 600+ pages!
archive.org/details/descriptionuseof00gunt/page/n8/mode/2up
