Sorry to keep kicking the slide rule/calculator thing around

[Christian Fandt]

Upon the date 12:55 AM 3/25/99 -0500, Multi-Volti Devices said something like:
>
> Hello:
>
> When I was in school, late 70's, there was a huge Tektronix calculator (maybe
> 18 x 24 ") on a roll around cart. Anyone whose batteries went dead got to
> borrow that thing. The professor would roll it up to you and make you turn
> your chair 90 degrees so everyone else couldn't read your answers across the
> room.


Hi Murray,

Could that have been a Tektronix Model 31 (aka TEK 31)? I've got one in my
collection. Look at URL
http://www.geocities.com/SiliconValley/Lab/7510/tek31.html to see a nice page a
fellow collector has.

If it's not the TEK 31 there is a link to show a Cintra 909 Scientist (which
Tek had brand-labeled after they bought Cintra.)

The more on-topic part of this is that I've recently to the collection a Heath
model IC-2008-A desktop calculator. Uses the SP-353 Sperry Planar Gas-discharge
displays (neon gas-filled sorta nixie-like devices which are flat and have
three numerals in a section). Seems some of the Heath ham gear and other test
equipment used Sperry displays but I have no experience seeing this yet to
confirm for sure.

I haven't checked component date codes yet but it looks like it's from around
1974-1976 from when the company I worked for went to using the same Sperry
devices back then.

Regards,  Chris
-- --
Christian Fandt,         Electronic/Electrical Historian
Jamestown, NY  USA      cfandt at netsync.net
Member of Antique Wireless Association
        URL: http://www.ggw.org/awa

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