| Subject: Re: switchover from glass thermometers to electronic digital |
Author:
 Rich
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Date Posted: Tuesday, April 19, 2011, 11:17: am
In reply to:
rb
's message, "switchover from glass thermometers to electronic digital" on Saturday, April 09, 2011, 06:18: pm
The first electronic thermometers I remember were used in hospitals in the early 70's. The thermister and other RTD electronic devices were part of my electrical engineering experiences in the 60's. The classic thermocouple is much older than that. All that has changed is the advancement and lower cost of custom integrated circuits that give the intelligence to the control circuit in the digital thermometer. Similarly, facsimile has been used for wirephotos since the 30's, but the microprocessor gave life to the office fax machine in the 70's.
The electronic devices are as accurate as the mercury in glass instrument, much faster, easier to use, very rugged, safer chemically, but not very stimulating to the fetish cravings in any of us.
Rich
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