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In message <cabxq0zczlhbjpzwt+jtxtgr+xgprao9x9ewkwxs+jaye2h8...@mail.gmail.com>
, "Donald E. Pauly" writes:

>Electronic thermal coolers did not exist then 

http://www.thermoelectrics.caltech.edu/thermoelectrics/history.html

>Electronic temperature sensors did not exist either.

https://en.wikipedia.org/wiki/Resistance_thermometer#History

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.
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