[AT] Transmission oil, 90-wt?

[John Hall]

I remember back in the '70's when they gave all the teachers kits with wood 
blocks painted different colors so they teach us kids the metric system. 
Funny, maybe they should have taught us math first!!!

We rarely see drawings in fractions any longer. I think the reason they 
disappeared is the tolerances are pretty much too loose. I forgot about 
dealing with metric surface finishes. The one that blew my mind is the third 
type of surface finish--ISO I think. First time we saw it (and there have 
only been a few) it took our customer about a half a day to tell us what it 
was supposed to be. They finally suppled me with a nice conversion chart for 
the 3 methods.

To get this post tractor related, WHS supplied me with several drawings for 
my Titan 10-20. It was definetly different looking at all those 80+ yr old 
prints. Normally we don't see prints over 10 years old and most are cad 
drawings--although not very good ones!!

John Hall
----- Original Message ----- 
From: "Larry D. Goss" <rlgoss at evansville.net>
To: "'Antique tractor email discussion group'" 
<at at lists.antique-tractor.com>
Sent: Monday, September 04, 2006 8:44 PM
Subject: RE: [AT] Transmission oil, 90-wt?


> Back in 1975 when we were "supposed" to make a concentrated effort to
> convert to metric measurements, I gave my college freshmen a test that
> covered both the US customary units and the ISO metric.  Guess what!
> They didn't have a clue about either one of them.  So I figured they
> needed to learn at least one and I tried to teach some fundamental ISO
> measurements for the next 20 years or so.  It was an exercise in
> futility.  What really muddied the waters was when we started working
> with the decimal inch system (standard everywhere except at Home Depot
> and Lowes).  I finally ended up letting the students work with either
> the ISO or the decimal inch.  Those students who insisted on working
> with the fractional inch system abandoned it within a matter of minutes
> when they found that no computer system supported it as a default mode
> of operation.
>
> Bottom line: students know more about how to text message each other
> than they will ever learn about any measurement system.
>
> Larry
>