[R-390] Slide rule calculations

[w9ya]

Good question Roy;

Napier was responsible for inventing logarithms as a computing method. And
this led to devices that were called "napier's bones" which I believe are
credited to a fellow by the name of Gunter and basically were used
individually with a divider to add logs..

The invention of the slide rule was credited to a fellow by the name of
Oughtred, who was a monk btw. (TWO rules slid against one another and a
slider was not needed. The cursor was added later btw.)

ALL these used simple log-scales.

It was two centuries later Roget proposed the log-log scales for slide
rules... which are just as they sound; a log of (times) a log. Interestingly
no one else thought of it prior to him and it took almost another 100 years
for them to become a manufactured item !!

Vy 73;

Bob
w9ya


On Sat, Dec 6, 2008 at 2:23 PM, Roy Morgan <k1lky at earthlink.net> wrote:

>
> On Dec 6, 2008, at 12:12 PM, w9ya wrote:...
>
>> "Who invented the log-log scales ?" They were first proposed by a fellow
>> named Roget. The SAME Roget from Thesaurus fame !!
>>
>
> Bob,
>
> I seem to remember the name Napier in connection with slide rules, or
> logarithms.
>
> Roy
>
> Roy Morgan
> k1lky at earthlink.net
> 529 Cobb St.
> Groton NY, 13073
>
>
>
>
>
>
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