[TheForge]Slide Rules was Excessive scaling?

[wmullett at bright.net]

I had an easy trick for getting the decimal place right without doing approximate math.  Graphically I think it was

A | A-1
---------
S | S+1

Slide goes left in multiplication, add decimal places - if it goes right, add & subtract one.  Division is shown below the line....

It's been a long time ... I have that drawn on the inside of my case and I would have to look at it to verify but I think I remember it correctly.
--------
From: "David E. Smucker" <davesmucker at hotmail.com>
Date: Tue Dec 12, 3:18 PM
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Subject: Re: [TheForge]Slide Rules was  Excessive scaling?

I had the good fortune to have both my father's K&E from the 30's (BSEE 
1933) and my Post from the 60's (BSME 1968) and gave them both to my son who 
is currently working on his PhD in Computer Science.  Something he can 
display on his office wall.  While I don't have the manual that came with my 
Post, I do have Dad's manual for the K&E.  Nice things to pass on.  I still 
remember my machine design professor who would tell us to bring a bucket of 
water to the final exam to cool or slide rules.  He expected us to be fast 
with our slide rules and to get the damn decimal place in the correct 
spot -- no credit if you miss placed the decimal.

Dave Smucker

----- Original Message ----- 
From: "Hufford, David" <David.Hufford at EKU.EDU>
To: "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Tuesday, December 12, 2006 7:31 AM
Subject: RE: [TheForge] Excessive scaling?


The slide rule ... what an ingenious implement.  I used one all through
college.  Wish I still had it.  Not long ago I saw one in an 'antique'
shop, along side an IBM PCJr.
David Hufford
Richmond KY

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