[Leica] Old stuff

[jhnichols at lighttube.net (Jim Nichols)]

I can match you with a IIIa, IIIf and both slide rules.  Never used a 
circular rule.

My 10" rule is a K&E Trig, because the college bookstore was sold out of 
Deci-Trig rules.  My small one is a yellow P&E that served me many 
nights before our wind tunnels got true digital instrumentation.  And 
not a battery to be found in any of them.

Jim Nichols
Tullahoma, TN USA

On 11/3/2015 10:44 AM, Larry Zeitlin via LUG wrote:
>   The discussion and photos of the Babbage Differential Engine of a couple 
> of weeks ago prompted me to dredge the pictured 50+ year old artifacts 
> from the bottom drawers of my desk. Many more are still interred there. 
> All still work as well as they did when they were new. No batteries are 
> required. Bear in mind that most of the bridges, all of the WW2 airplanes, 
> and all Leica lenses prior to the Summicron were designed using slide 
> rules and mechanical calculators. Will the Leica SL still work in half a 
> century?
> http://gallery.leica-users.org/v/Larry+Z/Old+stuff.jpg.html
> Larry Z
>
>
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