Rich,
I remember asking this question of a senior BS safety committee officer many
years ago. His opinion was that these symbols went back to steam systems
indicating the status of the boiler output i.e. the closed valve or the open
line. He went to great pains to inform me that these were not alphanumeric
and so were not binary states as I had originally thought.
We might all be wrong, however, and these may have as much real meaning as
'CE Marking'.
Regards,
Alan Brewster
Senior Systems Safety Engineer
----------
From: Rich Nute [SMTP:ri...@sdd.hp.com]
Sent: Tuesday, October 08, 2002 10:19 AM
To: emc-p...@majordomo.ieee.org
Subject: Origin of power symbols 0 and 1?
I am looking for the origin of the power symbols
0 (off) and 1 (on).
The earliest standards that I have are CEE 10
and similar where the standard specifies something
like:
"Where a rotary switch is used for power,
the 0 position shall be off and the 1 and
higher position shall be on."
Do you have the specific wording? Do you have
something earlier than the CEE standards?
Thanks for your help!
Rich
Richard Nute
Hewlett-Packard Company
16399 West Bernardo Drive
San Diego, California 92127-1899
Tel: 858-655-3329
FAX: 858-655-4374
e-mail: ri...@sdd.hp.com
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