Category Archives: Telegraph history

1926 Telegraph Practice Set

1926JunePMTelegraph

Here’s another more or less self-explanatory homemade telegraph set, from the pages of Popular Mechanics 90 years ago this month, June 1926. Unlike the one we featured a few weeks ago from 1916, this one relies on manufactured doorbell buzzers, and is intended to allow practice for aspiring radio operators, since the buzz of the doorbell more closely simulates the sound of a radio telegraph signal, as opposed to the clacking of the sounder of the landline telegraph shown in the earlier example. The article noted that the sound of the buzzer might be a lower pitch than desired, but explained how to increase the pitch by strategically placing a piece of paper in the buzzer.

This one can be set up either for practice at a single station, or two units can be interconnected as shown here. To receive, the other station needs to short out the key with the shorting bar shown.

The set is powered by two dry cell batteries. The article notes that if the two stations are some distance apart, such as in different houses, then a set of batteries might be necessary at each station.

In case you’re wondering, you can still find old-fashioned door bells, although they are getting harder to find.

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1916 Boys’ Life Telegraph

1916BLtelegraph2A hundred years ago this month, the June 1916 issue of Boys’ Life showed Scouts how to make this telegraph set. The plans are pretty self-explanatory. Closing the key energizes the electromagnet and makes the sounder sound. The article notes that it works just like a regular set used by the railroad and telegraph companies. It concedes that the set “isn’t much to look at, but it is a better one than Edison made when he was a beginner.”

1916BLtelegraph1

It went on to show the hookup for two sets (simply using three wires) to communicate with a friend “across the street, down the block, or over the way.”

Collins in 1910. Wikipedia photo.

The author of the article was A. Frederick Collins, a prolific early radio author of books such as the 1915 The Book of Wireless.  He was also the principal author of the 1922 Radio Amateur’s Handbook.

The 1915 Book of Wireless, as well as his contributions to Boys’ Life, came on the heels of the low point in his life, a 1913 conviction for mail fraud, arising out of exaggerated claims over a wireless telephone stock promotion. In 1917, the year after this upbeat Boys’ Life article, his wife filed for separation, stating that he “had come back to freedom… with his disposition ruined”, “soured against the world, soured against even his benefactors, and soured against her,” and engaging in “long harangues and tirades of invectives against the world in general and the United States government in particular.”  Collins died in 1952 at the age of 82.

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1926 Code Practice Set

1926JanPM

Ninety years ago, the January 1926 issue of Popular Mechanics showed this simple but ingenious device for practicing code. It allowed the aspiring radio operator a way to generate perfect code with a buzzer.

The board (preferably oak or ash) had a series of grooves.  At the beginning and end of each dot and dash a hole was drilled.  Copper wire was threaded up through the holes, forming a conductive path for each letter.  The other contact was slid over the letter at any desired speed, forming perfect code.

The article noted that a similar device had been used in the early days of the telegraph, presumably allowing unskilled operators to send (but not receive) messages.

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Mahlon Loomis: Inventor of Radio?

Loomis1965

It’s generally accepted in the history of science and technology that radio couldn’t have been invented until James Clerk Maxwell came up with Maxwell’s Equations in 1865.  That theoretically underpinning of radio were verified experimentally by Heinrich Hertz in 1887.  (Hertz, it turned out, was using electromagnetic waves of about two meters in wavelength, it turns, meaning that the first intentionally generated radio waves were probably in or near the two meter amateur band.)

The prevailing wisdom, which is more or less true, is that someone like Guglielmo Marconi in the 1890’s couldn’t have come along and turned radio into a practical device without the prior work of Maxwell and Hertz.

While that statement is generally true, it ignores Dr. Mahlon Loomis, a dentist and inventor who was born in 1826 and died in 1886, the year before Hertz’s experiments.  And it appears that in 1866, he successfully communicated wirelessly between two mountains fourteen miles apart.  Unfortunately, he produced no independent witnesses to verify the claim.  And his understanding was that some layer of the sky was completing a direct-current circuit, using the atmosphere as a conductor to send the direct current.

Even though his explanation is impossible, it’s likely that he was sending and receiving radio signals.  FIrst of all, his sending mechanism appears to have included a spark gap between the aerial and ground.  And more critically, Loomis found that the system would work only if the two aerials were extended to the same length.  He surmised that they were both coming into contact with the same level of the atmosphere, through which the DC current was conducted.  But the more likely explanation is that the two antennas were both resonant to the same frequency of radio wave.

In 1872, he was issued U.S. Patent 129971 for his wireless telegraph.  And in 1873, the U.S. Congress even chartered the Loomis Wireless Telegraph Company.  Loomis was, however, never able to raise sufficient capital to make the venture a practical reality.

It’s probably true that radio pioneers such as Marconi couldn’t have succeeded without Maxwell and Hertz telling them that it was theoretically possible to send electromagnetic waves through space.  But it’s not a foregone conclusion.  Loomis shows that history could have played out the other way around:  Someone could have accidentally discovered radio (as it appears that Loomis did), and only then the physicists could be called upon to explain how it works.

Fifty years ago this month, there was an interesting article about Loomis in Popular Electronics, October 1965, written by Thomas Appleby, W3AX.  The illustration above is taken from that article.  Appleby was also the author of Mahlon Loomis, Inventor of Radio, published in 1967.

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Elisabeth Lansdale Du Val, Ship Wireless Operator

S.S. Howard, Merchants and Miners Transportation Co.

S.S. Howard, Merchants and Miners Transportation Co.

Elisabeth (sometimes spelled Elizabeth) Lansdale Du Val (Hobleman) (1893-1987) was a ship wireless telegraph operator in the early days of radio, serving on the S.S. Howard of the Merchants and Miners Transportation Company line, in the employ of the Marconi Wireless Telegraph Company.  At the time, she was the only woman serving aboard a ship as wireless operator.

She was the daughter of Edmund Brice Du Val of 2200 North Charles St., Baltimore, and was the great granddaughter of Justice Gabriel Duvall (1752-1844), who was named to the U.S. Supreme Court by President Madison and served from 1811-35.

She passed the Commerce Department examination for a first grade commercial license on September 27, 1917.  On December 4, she began service as wireless operator on the Howard between Baltimore and Jacksonville.  She had sole responsibility for the afternoon shift, and was on watch each night.  Even though approximately fifty women held licenses, Miss Du Val was apparently the only wireless operator serving aboard a ship.

The Commerce Department had received numerous inquiries from women desiring to become wireless operators.  The department advised them that because of housing conditions on shipboard, there was hardly any demand for women as radio operators.  Instead, the department advised them to study American Morse, since there was a great shortage of landline telegraph operators due to the war, and that Western Union was providing instruction and even paying while new operators learned the trade.

On February 19, 1918, she applied to the Secretary of the Navy for a commission and assignment to a war vessel.  According to press accounts, the Navy “took the application under advisement,” but it was apparently never granted.

She married H.A. Hobelman, a 1917 graduate of Johns Hopkins University, on June 14, 1922.  Interestingly, in 1911, young Hobelman had contributed an item to Popular Mechanics for reducing stress on an anchor chain.  Mrs. Hobelman died in Maryland in 1987 at the age of 94.

References

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Morkrum Code of 1915

MorkrumTape

Many hams and others will instantly recognize the picture above as being the tape from a teletypewriter machine.  The machines were capable of sending faster than operators could type, so to reduce transmission time, the message could be punched onto the paper tape shown here and fed into the machine for later transmission.  I remember such devices still in use into the 1980’s by hams using radioteletype (RTTY), and the machines invariably originated from landline telegraph systems.

And most hams who look at the image closely will immediately notice that it’s a 5-bit code, and they will probably proclaim pretty quickly that it’s Baudot, since the Baudot 5-bit code was in use for many years.

They might be surprised to learn the age of this particular tape, and they will also be surprised to learn that it’s not Baudot.  This tape is a hundred years old, shown here from the May 1915 issue of Electrical Experimenter.  The technology was relatively new at the time, and the accompanying article describes it in some detail.    The particular tape shown here came from 1915APoperatorthe Associated Press, and is the beginning of a news item.  The AP New York office sent out 32,000 words a day over the wire, and this type of automation was necessary to handle the volume of news.  During the office’s busiest hours of the day (11:00 AM – 1:00 PM), three or four operators were perforating tape simultaneously so that these tapes could be fed into the machine that sent them out.  One of those operators is shown here.

MorkrumCode

And despite the similarities, the code being used in this tape is not Baudot.  It turns out that standardization didn’t take place for a few more years.  The code shown here is “Morkrum Code.”  If you look closely, you’ll see that the code for the letter A appears to be the same.  And like Baudot, it required the operator to shift from letters to characters and back again.  But the encoding is different.  If you’re interested in the history of the various codes in use, you’ll find them in an article entitled The Evolution of Character Codes, 1874-1968 by Eric Fisher.

The code that’s undoubtedly bringing these words to your screen are the ASCII code, an 8-bit code which came into use in the early 1960’s.  But the basic idea has been around for over a century.

The tape at the top of the page, read from right to left, reads as follows:

MER PAWNEE.  PHILADELPHIA. TO THE CLYDE
S S CO. WITH MDSE PASSED IN QUA

This scrap of tape appears to have originated five years earlier, since this snippet appeared in the shipping news of the  New York Tribune on August 25, 1910, in the clipping shown below.

1910ShippingNews

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Chicago Gets New Fire Boxes, 1864

FireAlarmTelegraph150 years ago today, December 5, 1864, the Chicago Tribune carried this item regarding fire alarm telegraph boxes to be installed in the city. The first was to be installed at the corner of Canal and Polk streets.

One spotting a fire would simply unlock the box, turn the crank, and the alarm would be transmitted to the central station, “unerringly, beyond the possibility of mistake.”

108 such boxes were to be installed. The keys would be given to policemen “and to trustworrthy persons resident nearest the place where the boxes are stationed.” This system, it was said, “cannot fail to vastly diminish the destructiveness of fires in Chicago.”

It’s not known whether such a box was installed in the vicinity of Mrs. O’Leary’s cow seven years later.


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Army Signal Corps Field Buzzer, 1916

U.S. Army Signal Corps Field Buzzer.  Technical Equipment of the Signal Corps: 1916.

U.S. Army Signal Corps Field Buzzer. Technical Equipment of the Signal Corps: 1916.

A hundred years ago today (September 21, 1914), the Calumet (Mich.) News carried an article entitled, “Communication Big Factor in Modern War Machinery,” which explained the technological developments in communications in use in modern warfare. The article runs down the developments in telegraph, telephone, and wireless in use in the war.

One that caught my attention was a rather ingenious telephone-telegraph that was used in situations where the lines were in poor shape. As the article points out, lines near the battlefield “are often laid at high speed, are of high resistance and are frequently leaky.” In those cases, it described a “special instrument known as the buzzer.”

It describes the instrument as a metal-lined leather case with a dry battery, induction coil and interrupter, key, telephone transmitter, and telephone receiver. It could be used as a field telephone, or by use of the buzzer, the key could send out an intermittent current which would traverse the line where the distant receiver would give out a sharp note. Thus, the telephone could be used to send Morse code via audio.

It notes that these “Morse signals are audible over an incredibly bad line.” It cites one case where a signal was successfully sent over bare wires lying on wet ground.

The schematic of the instrument is shown here:

The field buzzer itself is shown above as it would be carried, and it is shown dismantled here:

This diagram of a typical hookup of the buzzer shows its use with a line of dubious quality:

 

References

Camp Telephone for the Army, Telegraph and Telephone Age, July 1, 1917, page 302.


 

The Shohola Train Wreck of 1864: A Telegrapher’s Negligence

Shohola Tran Wreck of 1864

Shohola Tran Wreck of 1864

A hundred fifty years ago, the technology of the telegraph had been adopted by the railroads, and great reliance had been placed upon the device. And the Shohola train wreck of July 15, 1864, shows the horrific consequences apparently caused by one telegrapher’s negligence. On that day, at least sixty men died because the telegrapher failed to relay a message.

On that day, an 18 car train was transporting 833 Confederate prisoners of war, many of whom had been captured at the Battle of Cold Harbor.  They were guarded by 128 members of the Union Veteran Reserve Corps.  The train was travelling from from New York, where the prisoners had arrived by steamer from Maryland, to the prison at Elimira, New York.

The train was designated as an “extra,” meaning that it was not scheduled service, but instead followed behind a scheduled train. The scheduled train displayed flags which alerted that the extra was following, and continued to have the right of way.

The train with the prisoners had been delayed while guards located missing prisoners, and while it waited for a drawbridge. It was running four hours behind schedule by the time it got to Shohola, Pennsylvania. At about 2:45 PM, the train was on the single track between Shohola and Lackawaxen junction, proceeding at about 25 miles per hour.

At Lackawaxen was stationed the telegraph operator Douglas “Duff” Kent. In the morning, he had seen the scheduled train pass with the warning flags, and it was his responsibility to hold all eastbound traffic until the extra train had passed. At about 2:30, a coal train arrived at Lackawaxen, and the conductor asked whether the track was clear to Shohola. The telegrapher, Kent, answered in the affirmative.

The trains were barely a hundred yards apart when the horrified engineers realized their predicament. There was no time for the engineers to even jump from the engine, and both were killed, along with the two firemen and one brakeman. In addition, 51 Confederate soldiers and 17 Union soldiers were killed. The Confederate dead included thirteen members of the 51st North Carolina Infantry. Two prisoners escaped and were never accounted for.

Most of the dead were buried alongside the track. The Confederate prisoners were buried in coffins hastily constructed from the lumber of the wreckage, four to a coffin. The Union soldiers were buried singly in pine coffins which had been brought to the scene. In 1911, all of the dead were exhumed and brought to Woodlawn National Cemetery in Elmira. The citizens of Shohola, Pennsylvania, and Barryville, New York, tended to the wounded “without regard to the color of their uniforms.”

Soon after the collision, Judge T.J. Ridgway arrived on the scene and impaneled a jury. An inquest was held and the burials proceeded. The verdict was that no railroad employee was to blame, and that the accident was unavoidable.

The New York Daily Tribune of July 18, 1864 noted that it was “desirable that something more than the sham investigation by the jury should take place.” The Daily Tribune reports that the telegraph operator is “said to have been intoxicated the night before, but until he can be met with, and the public will demand of the State authorities to see that he is, and can be confronted with the conductor of the coal train, it will not do to place too much reliance on the statement of the latter.

The Tribune continues, “it is the duty of each telegraph clerk to telegraph to the clerk at the next depot immediately the train has passed his station. At Lackawaxen were were unable to see the book kept by the absconding operator.”

And abscond he did. Other reports were that Kent “did not take the wreck very seriously,” and reportedly went to a dance that evening. When the public began to realize his role, he left town and was never seen again.

The Tribune’s reporter wrote:

Sadly familiar as the last three years have rendered the country and the public with tales of blood, scenes of slaughter, and the accumulated horrors of the battle-field, we are not yet so used to them as to feel unmoved when, on a smaller scale, some fearful railroad catastrophe brings them to us, face to face, amid the quiet of civil life. One of these terrible catastrophes, the most terrible that has happened in this country for some years, took place on Friday morning last, when the grave was again opened to receive a hecatomb of human life, offered at the shrine of managerial inefficiencyand subordinate recklessness.

References

The Great Shohola Train Wreck

Shohola Train Wreck at Wikipedia

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The Telegraph of 1797

Samuel F.B. Morse

Samuel F.B. Morse

When we think of the telegraph, we usually think of the version invented by Morse (and others).  But the word “telegraph” has been around a lot longer than that, and much thought was given to the problem of rapidly communicating over long distances.

This is made clear by the discussion of the telegraph in the 1797 edition of the Encyclopaedia Britannica.  I’ve scanned that article and have it posted at my website at this link.

1797 Encylopaedia Britannica Telegraph

 

The figure shown here is a representation of one possible scheme using 1797 technology.  It’s also clear that the author anticipated the great developments that took place in the coming decades:

Were telegraphs brought to so great a degree of perfection, that they could convey information speedily and distinctly; were they so much simplified, that they could be constructed and maintained at little expence–the advantages which would result from their use are almost inconceivable. Not to speak of the speed with which information could be communicated and orders given in time of war, by means of which misfortunes might be prevented or instantly repaired, difficulties removed, and disputes precluded, and by means of which the whole kingdom could be prepared in an instant to oppose an invading enemy; it might be used by commercial men to convey a commission cheaper and speedier than an express can travel. The capitals of distant nations might be united by chains of posts, and the settling of those disputes which at present take up months or years might then be accomplished in as many hours. An establishment of telegraphs might then be made like that of the post; and instead of being an expense, it would produce a revenue. Until telegraphs are employed to convey information that occurs very frequently, the persons who are stationed to work them will never become expert, and consequently will neither be expeditious nor accurate, though, with practice, there is no doubt but they will attain both in a degree of perfection of which we can at yet have but little conception.

For more books about the history of the telegraph, you can visit my old radio books page.