History

This Day in History, Sunday, Nov. 5, 1939: The Zossen conspiracy against Hitler collapses in Berlin and in Ottawa 75 years ago today, CBC Radio begins broadcasting the Dominion Observatory official time signal, marking 1 p.m EST

Franz Halder und Walther v. Brauchitschobservatorynrc

It was a Sunday:  Nov. 5, 1939.  In Berlin, After plotting with Franz Halder, chief of the Oberkommando des Heeres (OKH), the supreme high command of the German Army,  and Generaloberst Ludwig Beck to arrest Adolf Hitler, unless he relented on the plan for a western offensive,  Walther von Brauchitsch, the commander-in-chief of the German Army, met with Hitler to discuss the plans for an attack in the west. Von Brauchitsch argued strongly that it should not take place as scheduled on Nov. 12 (“X-day”) because of weaknesses in the German Army.  Hitler was unconvinced by the arguments, von Brauchitsch lost his nerve and returned to OKH at Zossen, where the so-called Zossen conspiracy collapsed.

Meanwhile, Col. Hans Oster of the Abwehr (German Military Intelligence), who was one of the Zossen conspirators, warned Col. Gijsbertus Jacobus (Bert) Sas, the Dutch military attaché in Berlin, of the impending invasion of the Low Countries. Sas informed the Belgian military attaché.

That same day 75 years ago today in Oslo, the German government lodged a  diplomatic protest with the neutral Norwegian government against them allowing the release of the interned SS City of Flint, a Hog Islander freighter of the United States Merchant Marine, and the first American ship captured by the Germans during the Second World War. Norway rejected the German protest.

And in Ottawa? Well, on that Sunday 75 years ago today, CBC Radio began network broadcast on Nov. 5, 1939 of the Dominion Observatory official time signal, when listeners coast-to-coast first heard an announcer intone  “the beginning of the long dash, following 10 seconds of silence” officially indicated the arrival of 1 p.m. Eastern Standard Time (EST), and is now the longest-running feature on Canada’s public broadcaster. The Canadian Broadcasting Corporation says, “Generations of CBC Radio listeners have set their watches and clocks to the familiar daily refrain, aired promptly at 12:59 p.m. Eastern Standard Time.”

The signal allowed Canadians access to exact time in a world of analog clocks. Mariners and surveyors  especially relied on an accurate time signal to calibrate their instruments for navigation and mapping.

John Bernard, discipline leader, Measurement Science and Standards, at the National Research Council of Canada (NRC), the country’s official timekeeper, which provides the correct time to the CBC, says the story of the time signal being broadcast on CBC actually has its roots as far back as 1924. Canadian National Railway (CNR) had a radio station called CKCH, which began broadcasting the time signal from the Dominion Observatory in Ottawa at 9 p.m. every day. Eventually that station was bought by the Canadian Radio Broadcasting Commission, the forerunner  to the CBC.

The “long dash” system has nothing to do with Morse code. Bernard said the system originated in the 1920s, when radio was in its infancy. “Back in the old days, when they didn’t have voice announcements, they would have certain seconds missing so that somebody who just picked up the radio broadcast would be able to identify the time of day by the code of missing seconds.” he said.

The NRC has a continuous live stream with CBC in Ottawa, and the official time is then broadcast out to each region for the official time signal. A CBC announcer then introduces the “long dash,” which is the point the NRC broadcast begins.

To determine the official time, the NRC uses atomic clocks, that use microwave signals and atoms to provide accurate time. The NRC has a minimum of three atomic clocks running at any given time to ensure that there will always be backups in case one breaks or is inaccurate. They gain only a few microseconds a year.

Still, despite being billed as 1 p.m. Eastern Standard Time, well, it’s not exactly, Bernard admits. While the NRC time is accurate, there is a “propagation delay” caused by the “satellite hop” and “buffering” of the data by CBC, causing about a third of a second delay, making it fractionally late in broadcasting the time. But close, very close, to accurate.

You can listen here to an audio clip  from its archives of the famous CBC “long dash” time feature, originally broadcast on Monday, Feb. 4, 1974: http://www.cbc.ca/archives/categories/science-technology/measurement/general-5/1939-the-beginning-of-the-long-dash.html

See related time stories at https://soundingsjohnbarker.wordpress.com/: George Vernon Hudson, Daylight Saving Time and the coming Hour of Ambiguity Nov. 2: https://soundingsjohnbarker.wordpress.com/2014/10/29/george-vernon-hudson-daylight-saving-time-and-the-coming-hour-of-ambiguity-nov-2/ and Skip a day? Why not, Samoa didhttps://soundingsjohnbarker.wordpress.com/2014/09/29/skip-a-day-why-not-samoa-did/

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