Significant digits in a float?

[Adam Funk]

On 2014-05-01, Dennis Lee Bieber wrote:

> On Tue, 29 Apr 2014 20:42:33 -0400, Roy Smith <roy at panix.com> declaimed the
> following:
>
>>In article <mailman.9594.1398818045.18130.python-list at python.org>,
>> Dennis Lee Bieber <wlfraed at ix.netcom.com> wrote:

>>> (one reason slide-rules were acceptable for so long -- and even my high
>>> school trig course only required slide-rule significance even though half
>>> the class had scientific calculators [costing >$100, when a Sterling
>>> slide-rule could still be had for <$10]) <G>
>>
>>Sterling?  Snort.  K&E was the way to go.
>
> 	Math teacher was selling them in my 10th grade... Actually I already
> owned a Faber-Castell 57/22 "Business" ruler (which did NOT have the CF/DF
> scales set for *PI) and a Pickett N-1010-ES Trig rule.

What does a "business" slide-rule do?  Depreciation?


-- 
"Mrs CJ and I avoid clichés like the plague."