April 2012
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Shut up! shut up! I am working Cape Race

So sent wireless operator John “Jack”  Phillips on the night of April 14th, 1912, and likely sealed the fate of some 1,514 passengers and crew of the RMS Titanic, radio call sign MGY.  That message was sent in response to the radio operator on the SS Californian/MWL, who was attempting to report icebergs nearby.

RMS Titanic side view

RMS Titanic side view

Of course, it would be a gross error to blame the sinking of the Titanic on the radio operator, he was but one small link in a long chain of events that unwound that fateful night one hundred years ago.  Beginning with the ship’s design and ending with the Captain of the Titanic, Edward Smith, many seemingly unconnected decisions lead up to the ultimate disaster that befell the Titanic.

After about four days at sea, during the late morning/early afternoon of April the 14th, the Titanic began receiving wireless messages indicating “growlers, bergs and ice fields” were in the area.  The Captain decided to alter the ship’s course to the south, out of the supposed ice fields.

In spite of numerous reports of nearby ice, the Captain did not order the ship to reduce speed.  It continued on at 22 knots (41 kp/h)  up until the time it struck the berg.  Lookouts were posted in the crows nest, near the bow, to spot icebergs.  This was considered normal operating procedure at the time, but is the most significant factor in the collision.  A number of nearby ships had spotted ice and had greatly reduced speed or stopped for the night.  Further exacerbating the situation, the lookouts on the Titanic did not have binoculars, which was due to a mix up before they sailed from England.

Some of the ice reports received later in the day and evening did not make it to the bridge.  Wireless operator Jack Phillips was either repairing a malfunctioning spark gap transmitter or was sending messages from passengers to Cape Race Radio/MCE, Newfoundland.  At the time, the (wireless) radio operators were not a part of ship’s company, but rather were employed by the Marconi Company for the purpose of sending messages for profit.  Any notion of safety or distress communication was an afterthought.

The SS Californian, closest ship to the Titanic at the time it sunk, was attempting to broadcast another ice warning to all ships in the area at about 10:30 pm.  The message was broken off by Phillips with a terse: “SHUT UP! SHUT UP! I AM WORKING CAPE RACE”  At about 11:30 pm, Cyril Evans, the Californian radio operator closed station and went to bed. Ten minutes later, the Titanic struck the iceberg.

5 KW synchronous rotary spark gap transmitter

5 KW synchronous rotary spark gap transmitter

The Titanic used a 5 KW synchronous rotary spark gap transmitter, which was state of the art at the time.  The power is measured at the input of the DC motor.  Considering the efficiencies of the motor and generator, the ability of the spark gap to generate RF and the efficiency of the tuning circuits and antenna, the actual power radiated by the transmitting antenna would have been significantly less, on the order of a couple of hundred watts.   The above schematic is not exactly the same as the unit installed on the Titanic, as the meters and additional controls for motor speed and generator voltage have been omitted.   Additionally, some sources report the transmitter as a 1.5 KW non-synchronous unit.  The difference between the two would be very apparent in the sound of the received signal; a synchronous transmitter had a tonal quality to it versus a non-synchronous or simple spark gap, which sounded like hissing.  Wireless operators from shore stations and other ships who worked the Titanic reported that they were using a synchronous unit.

The transmitter used two frequencies; 600 meters, or 500 KHz and 300 meters, or 1,000 KHz.  Because of these frequencies, maximum range during daylight hours was about 200-400 miles (322-644 km).  Night time, the ranges were considerably more, 1,000-2,000 miles (1600-3200 km), which is typical for medium frequencies, including the AM or standard broadcast band in use today.  Thus the effort by the Titanic radio operators to clear the backlog of message traffic out during darkness, when Cape Race was about 374 miles (602 km) away.

Another part of the problem was with the transmitting and receiving apparatus itself.  The transmitters were crude and generated broad harsh signals.  The receivers were also very broad, and nearby transmitting stations could easily wipe out all frequencies on early receivers.  That is what likely prompted Phillips’ outburst, something termed today as blanketing interference.  Vacuum tubes (aka valves) had yet to accepted for wide spread use as amplifiers and most receivers were simple tuned circuits connected to a detector of some type.  As such, receivers were far less sensitive and selective than they are today.

Interestingly, the Titanic had both types of receiver on board.  The main receiver was a tuned circuit with a Marconi Magnetic detector (aka “Maggie”) and a valve receiver as a backup.  The valve or vacuum tube was likely a simple diode detector connected to a tuned circuit.

After the collision, Jack Phillips stayed at his post sending out distress messages and communicating with other ships en route to assist.  Long after the Captain told the radio operators they were dismissed, Phillips persisted until power was lost and the radio room began flooding.  He perished shortly after in the 28° F (-2°C) water, however, assistant operator, Harold Bride, survived.

There is also some bit of discussion about the rudder commands given after the iceberg was sighted.  Most accounts say First officer, William Murdoch, gave the command “Hard over starboard” which would be the equivalent of right full rudder, effectively turning the ship to the left.

As rudders work, the amount of water flowing over the rudder determines its effectiveness or loading (resistance to water flow).  With the center screw turning at full speed, the rudder would have quickly loaded and pushed the rear of the ship away from center line by re-vectoring the water coming from the propellers.  There is no way to know if this would have changed the outcome as not enough is known about the maneuverability of the Titanic.  Her sea trials consisted of about seven hours of sailing time before passengers were embarked.

The next commands issued were “full astern,”  on the engine room telegraph.  Because of the design of the ship, it took about thirty seconds to engage the rudder and backing engines.  The ship continued straight ahead at 22 knots (11 meters per second), traveling 372 yards (340 meters) before beginning to turn.  The center screw had no reverse, so it was simply stopped.  Once the engines were reversed, the rudder lost much of its effectiveness due to turbulent flow and stalling.  The ship could not maneuver around the iceberg, striking it in a glancing blow springing the hull plating in five forward compartments on the starboard side.

As it was the Titanic’s maiden voyage, the first officer did not have much deck time and was likely less familiar with the maneuvering characteristics of the ship versus other ships he had conned.  On most other ships of the time, including the SS Californian, which had just completed the identical maneuver, that combination of rudder and engine room telegraph commands would have been appropriate to stop and swing the ship around the berg.

The SS Californian was within sight of the Titanic as it sunk, observing several “rockets” (as many as eight) being fired. When informed of the rockets, the Captain of the Californian asked their color, but did not move to investigate or waken the wireless operator.  According to some of Californian bridge crew, the Titanic looked strange in the water, like something was wrong.  The Californian attempted to signal the Titanic with blinking light, which was not acknowledged.  Inexplicably, the Californian never attempted to investigate further until 5:30am the next morning when wireless operator Evans was back on duty and reported the sinking to the bridge.

Therefore, the entire chain of events that led up to the disaster include:

  1. Too few life boats for passengers and crew
  2. Not enough training in deployment of life boats
  3. Very short sea trail period for the ship’s crew before passengers were embarked
  4. Over confidence in the water tight door system in keeping the ship afloat
  5. Binoculars for lookouts not procured in time for sailing
  6. Ship’s rate of speed too fast for conditions, with numerous reports of ice in the area
  7. Ship’s radio operator dismissing ice report from nearest ship (almost within view at the time) so he could continue to send paid message traffic
  8. Combination of helm and engine room telegraph commands did not produce optimum maneuvering
  9. Failure of nearest ship to recognize distress flares (or rockets) as such and render assistance

Change any one of those nine things and the outcome might be entirely different.  Something to ponder.

The result of this disaster was the formal codification shipboard safety requirements known as SOLAS or Safety Of Life At Sea.  Those standards include the transmission of distress signals, distress communications, numbers of life boats, radio watches, fire suppression systems, and training for passengers and crew.  Currently the distress communication system is known as the Global Maritime Distress Safety System or GMDSS.

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6 comments to Shut up! shut up! I am working Cape Race

  • Dewey Jacks

    Very nice article and explaining how the spark gap transmitter operated! Very interesting for this ham to read!

  • paul

    Dewey I should do more on spark gap transmitters. They are quite interesting. The synchronous spark gap was the last design used before the adoption of contineous wave oscillator transmitters using valves.

    When I was studying for a 2nd class radiotelegraph license there were a couple of questions in the study guide about spark gap transmitters. This was in 1990.

  • joe

    It would be interesting, and possibly sad, to see the op’s log. You really wonder about the relative importance of the traffic which was being conducted.

  • John NA6L

    Sticking a hand in the innards of the spark gap transmitter would be a quick trip to Davy Jones Locker.

    “There is also some bit of discussion about the rudder commands given after the iceberg was sighted. Most accounts say First officer, William Murdoch, gave the command “Hard over starboard” which would be the equivalent of right full rudder, effectively turning the ship to the left.”

    The “right full rudder” — “Hard over starboard” info is a bit confusing (quoted above) because actually this helm command will cause the ship to turn to the RIGHT and not to the Left. The confusion comes from the fact that as the helm is moved to the Right, the stern (back of the ship) pivots to the Left — (like driving a rear steer fork lift) but the bow (front) and the direction of the ship will go to the Right. Conventional ships and boats tend to pivot about 1/3 of the way back from the bow when making turns.

    Part 2.

    “As rudders work, the amount of water flowing over the rudder determines its effectiveness or loading (resistance to water flow). With the center screw turning at full speed, the rudder would have quickly loaded and pushed the rear of the ship away from center line by re-vectoring the water coming from the propellers. There is no way to know if this would have changed the outcome as not enough is known about the maneuverability of the Titanic. Her sea trials consisted of about seven hours of sailing time before passengers were embarked.”

    About the part “As rudders work” it is kinda’ sorta’ correct for the Titanic era “barn-door” rudders because they really were just big “deflectors”. Like a wing, modern foil shaped rudders really do have “flow” over their surfaces due to hydrodynamics and they lift or “pull” their low pressure surface in the opposite direction from the direction that the rudder is turned — the foil’s lifting surface will “suck” the rudder to port during a Starboard helm. Swing the stern to Port (Left) and the ship goes toward Starboard (Right).

    Port & Left both have 4 letters and for running lights, which is green and which is red? What color is Port wine??

    Starboard has a couple of Rs in it “RIGHT” ?

    Regards, John NA6L

  • John Cauchi

    Hello John NA6L, you are right in your description… if you see the film Titanic, you will notice that the officer said “Hard-her-port” and the helmsman is seen turning the wheel to starboard. Was this film-production intentional? How do Engineering-Radio know precisely that this actually happened? was there proof of this? How do we know who actually gave that order? so many confusing assumptions and descriptions (some to great details) without actual proof…
    Best regards
    John Cauchi
    ex Radio Officer

  • Very interesting and very well done. You nxt want to pick up “TITANIC CALLING” which was written using the radio traffic between the ships and shore. TITANIC/MGY exchanged a dozen messages with OLYMPIC/MKC, nearly 500 miles to the East (south-south-west of coast station on Sable Island/MSD). Marconi had been commissioned to produce three 5 kW synchronous rotary spark wireless stations for the three Olympic class ships, since the first ship had one installed, I see no reason why TITANIC would not have had one installed as well, and I’ve never heard that before. I loved your description of steering by rudder and the new advances in rudder design. 73 to you, David J. Ring, Jr., retired Radio Officer.

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