My recollection of a conversation many years ago is that it was not 0 and 1, but rather O (circle) and | (line).
Leo Simon -----Original Message----- From: Brewster, Alan [mailto:[email protected]] Sent: Tuesday, October 08, 2002 7:40 PM To: Rich Nute Cc: [email protected] Subject: RE: Origin of power symbols 0 and 1? 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:[email protected]] Sent: Tuesday, October 08, 2002 10:19 AM To: [email protected] 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: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
