Monthly Archives: November 2014

1934 Philco Ad

1934Philco

Eighty years ago today, November 16, 1934, the Milwaukee Journal carried this ad for this Philco “lowboy” console radio for $59.95. You could have the radio installed in your home for ten percent down.

The radio is Philco model 45L, and covered both standard broadcast and short wave. In fact, this package included a short wave antenna kit, a Radio Atlas of the World, and an “Admiral Byrd Revolving Globe.”

The receiver was probably a pretty good performer. It had six tubes, and two IF stages. You can find a schematic and more information at RadioMuseum.org.



Emergency 1943 Radio Receivers, Including Converting Lightbulb to Diode Tube

Converting dual-filament lamp to diode tube

A homemade diode vacuum tube.

A wartime issue of Radio News, January 1943, includes an interesting article entitled “Emergency Radio Receivers.” The article notes that “‘horse and buggy’ receivers employing the simple detectors are just as workable today as they ever were.” With wartime tube and battery shortages, and the possibility of power line disruptions, “the present war emergency may yet recall these simple sets from their resting places on museum shelves.” Their greatest value in time of war was as emergency receivers. “Such sets may be placed into immediate service when power lines have snapped out and “B” batteries are not available for the family portable. They may be carried into bomb shelters where electric power is not available. Particularly unique is the fact that they may be made so small in size as to be carried easily in a pocket or handbag.”

This was not the last time that the usefulness of crystal sets was considered for emergency preparedness. A 1963 Office of Civil Defense report noted that for the “economy minded,” even a crystal set would be adequate for receiving local broadcasts after a nuclear war.

The article then describes a number of possible crystal detectors that could be used in an emergency receiver. (One not mentioned was the razor blade of the foxhole radio, which made its debut the following year, in 1944.)

VHF Crystal Set

VHF Crystal Set

For those interested in experimenting with crystal sets, the article provides a good introduction to the subject. Three of the ideas shown are rather novel. The first is an “effective crystal circuit for fixed-frequency ultra-high-frequency reception,” shown here. The terminology has changed, and we would today call these VHF frequencies. It notes that this circuit provides “interesting possibilities for portable (personal) use in short-range civilian defense communications employing the ultra-high WERS (War Emergency Radio Service) frequencies” of 112-116 and 219-225 MHz. Contrary to popular perception, there’s no reason why a crystal set can’t be used on VHF. In fact, here’s one interesting example of a crystal set for the FM broadcast band.

CW Crystal Set

CW Crystal Set

The article also shows a method for receiving CW signals on a crystal set, a task I would have thought to be impossible without some active component such as a tube or transistor. The article explains that to receive CW, it is only necessary “to include in the circuit some form of continuously-running, high speed interrupter.” It shows how to do this with a motor-driven commutator which interrupts the RF circuit. This makes the CW signal audible, with a pitch proportional to the speed of the interrupter. A rheostat controlling the speed of the motor thus adjusts the CW pitch.

Converting dual-filament lamp to diode tube

Converting dual-filament lamp to diode tube

But the most remarkable idea in this article is making a homemade vacuum tube diode using a double-filament lamp. The article explains how a diode tube can be made from a type 1158 lamp. This lamp, which is still readily available, has two filaments, one brighter than the other. The brighter filament is intentionally burnt out by applying a high voltage. This leaves the other filament intact. The good filament is then used as a directly heated cathode. And the support rod for the burnt out filament acts as the plate of the tube. The result is that the automotive light bulb is converted into a diode vacuum tube. It is used in the circuit shown here as a radio receiver:

Radio circuit using light bulb detector

Radio circuit using light bulb detector

The article notes that the filament has a rather high current (about 750 mA for a modern example), but “this drawback should not be of monumental concern if the diode receiver is to be operated during rather short, emergency periods.”

Any dual-filament DC bulb should serve the same purpose, but the 1158 bulb specified in the article is still readily available. It’s probably available at a local hardware store, and it’s also available at a reasonable price from Amazon. Since six-volt automotive bulbs aren’t very common these days, it would probably be better to substitute the 12-volt version, the 1157, which should be available at a local auto parts store, or online at Amazon or WalMart
icon. Another possible option would be to use a 120 volt 3-way light bulb. In that case, of course, you should take care to keep the headphones isolated from the AC line.

For ideas on where to get other needed parts, you can check my crystal set parts page.


Burning of Atlanta, 1864

Today marks the 150th anniversary of the burning of Atlanta. On November 14, 1864, General Sherman began his march to the sea, with orders to burn the City of Atlanta, excepting only its courthouse, churches, and dwellings. This photo shows Atlanta’s Union Station in ruins.



Twelve Year Old Aspiring Architect Makes Good

JohnLaneEvans

A hundred years ago today, November 13, 1914, the Philadelphia Evening Ledger carried this illustration of this 12-year-old young man, one John Lane Evans of 5215 Chester Avenue in that city, with his model of the U.S.S. Oregon.

Ship upon which the model was based, 1898 (Wikipedia image)

Ship upon which the model was based, 1898 (Wikipedia image)

As might be expected, Mr. Evans went on to become an architect. In 1961, he became the City Architect of Philadelphia, serving in that position until 1975, where he designed buildings such as this police station. He died in 1994. His papers are held by the Architectural Archives of the University of Pennsylvania.


Is Reporter Jay Kolls a Racist?

Minneapolis mayor either "flashing a known gang sign" or "pointing." KSTP photo.

Minneapolis mayor either “flashing a known gang sign” or “pointing.” KSTP photo.

By now, we have all seen KSTP reporter Jay Kolls story about “a photo of Minneapolis Mayor Betsy Hodges posing with a convicted felon while flashing a known gang sign.

The conventional wisdom is that the mayor was  merely pointing at the person, and I tend to agree with that interpretation of the picture. And since the convicted felon in question is African-American, the conventional wisdom, is also that Kolls and KSTP are racist.

Before we decide whether Jay Kolls is racist, we need to first figure out whether you and I are racist.  I’m a white Republican, so presumably, I’m the last person who can provide good information about racism. On top of that, I have the distinction of having gone through 13 years of the Minneapolis Public Schools during a time in which I encountered exactly one (1) fellow student who was African-American. And it turns out she was adopted. In short, I’m the kind of person one can probably count upon to be racist.

It turns out I am a racist. But that doesn’t mean you shouldn’t listen to me, because you’re probably a racist too.

When I say that I’m a racist, I guess it’s important to give a little bit of definition. It can mean two things. It can mean that I am hateful toward certain people because of their race. That definition doesn’t fit me, and it probably doesn’t fit you. There are a handful of people who fit that definition, and anything I say or anything you say won’t make much difference. Fortunately, in my experience, there are very few people who fit into that category. They’re probably a lost cause, and there’s not much you and I can do to change them.

I’m not that kind of racist, and neither are you. But I do make judgments about people based on their race, and so do you. I’ve come to realize this over the last few years in my business as a Continuing Legal Education provider. Lawyers in most states need a certain number of hours of continuing legal education per year, and I provide those classes. In Minnesota, attorneys need two credits of “elimination of bias,” a subject I assumed that I was completely unqualified to teach. But I kept getting requests, since those were the credits that Minnesota attorneys needed. Finally, I put together a course, and I was hard pressed to fill up one hour with meaningful content. I found some reports prepared by the Minnesota Supreme Court, and we talked about them. Over the years of presenting this course, it has grown, and I can now easily discuss the subject for well over two hours. Everyone gets their full credit and they go away happy. And it turns out that they actually learn something in the process. But I probably learned more than they did.  learned that I’m a racist, and so are you.

This is a natural effect of my background, and it’s also a natural effect of your background. As noted above, I went through 13 years of school without encountering very many black students. I don’t remember the incident, but the first black person I met was apparently an emergency room physician when I was about four years old. I got my head cracked open (which some say explains many things), and I was rushed to the emergency room to have it stitched back together. The doctor faced with the task of sewing me back together was black. My parents were horrified. They weren’t horrified because the doctor was black; they were horrified that I would blurt out something embarrassing, because I had never seen a black person before.  We didn’t have black people where we lived.

It turns out that I didn’t blurt out anything embarassing, and I apparently didn’t even notice. I was apparently too concerned with my injuries to notice the skin color of they guy sewing me back together. (I have reflected over the years that it was somewhat remarkable that a black man was a doctor in 1965. This took place in Indiana, and it was later explained to me that the doctor was probably from the South and went to school in the South, but had to move to Indiana in order to work as a doctor.)

My first real interaction with a black person was with my seventh grade math teacher. He was a pretty good teacher, and as I recall, he was one of my favorite teachers. And he was black. This was not a big deal to me at all, since I had been instructed, quite correctly, over the previous six years that I should not judge people by the color of their skin. But up until that point, a “black person” was a theoretical concept. I had seen black people on TV, but they were usually on TV only because they were black. They typically weren’t on TV for other reasons.  I remember a school assembly, which was probably in 1968, where our white teachers talked about a black man named Martin Luther King. They explained that he was a great man who got shot because he was black. I understood this at a theoretical level, and I knew that there was nothing wrong with black people, even though some people apparently thought that there was.

But until seventh grade, I never had any interaction with a black adult, and I had met only one other black student. I did learn that there were a handful of people who were hateful toward people of other races. One day, when another student was  annoyed with something the teacher had done, I heard her mutter under her breath, “dumb n—-.” I was shocked, because I had been told for six years that this was wrong.  I knew that there was one nutcase in Memphis who hated people because of the color of their skin, but it was rather shocking to know that one existed in person.  But that was the exception.  I’ve never met too many people like that.  Unfortunately, they’re probably a lost cause.

Even though I went to an all-white school in an all-white neighborhood, other than this single example, I never encountered a single person who was hateful toward other people because of the color of their skin. I’m sure there were other examples. And I’ve later heard of other examples right in my old neighborhood. But these were the exception. Most people didn’t hate other people. I certainly didn’t.  And I doubt if you do.

But I just told you that I was a racist and that you’re a racist. How to I reconcile this contradiction?

One of the lawyers who took my CLE program related a story about what happened to him in court, and I think it illustrates perfectly why I am a racist. He was in court before a judge, and I think he would attest to the fact that the judge in the case was not racist, in the sense of having any hateful attitudes toward anyone. But she did something that I’m quite certain was motivated by the same racism that I have and that you probably have.

Not surprisingly, in court proceedings, tempers can occasionally flare. When they do, the judge typically gets things back on track by sternly admonishing the people involved. If things get really out of hand, then the judge might impose some sanctions. But generally, a scolding does the trick. This lawyer described an incident that’s not particularly extraordinary. The opposing lawyer was questioning a witness, didn’t like the answers he was getting, and was getting angry. At one point, he reached across the table and grabbed the papers that the witness was consulting. Needless to say, this isn’t the correct procedure. The attorney I know reacted by standing up and shouting something, and probably grabbing for the papers to give back to his client.

The judge’s life experience probably included many situations where two angry lawyers were arguing with each other. Normally, she probably would have done something like say, “gentlemen, stop that!” If it was particularly bad, perhaps she would have held one of them in contempt and leveled a fine. She would have known what to do, because she’s seen angry lawyers before, and knows what to do in order to cool them off.  That’s just part of her life experience.

But this wasn’t an ordinary case of two men being angry. It was a case of two angry black men. And to make matters worse, it was two big angry black men. And everyone else in the room was black.

She had probably never encountered this situation before: Two angry black men shouting at each other in a room where she was the only white person. Or even worse, she did have experience (perhaps just from watching TV) with angry black people shouting at each other. From her experience, she knew that this sort of thing usually turned violent. That’s a perfectly logical conclusion: Every time she has seen angry black people before, it turned violent. She had previously seen angry white people calm down.  She had never seen an angry black person calm down.

So she did exactly what I probably would have done. She did the racist thing. She pushed the “panic button” and quickly exited the room. Armed bailiffs quickly took her place and restored order.  She wouldn’t have pushed the panic button on two white lawyers.  So she must be racist, just like me.

She made a judgment based on her experience, and her judgment was probably the same one I would have made. After all, she is racist, and so am I. I don’t have much experience with angry black people, other than what I see on TV. After all, I spent the first 18 years of my life not having any black peers. I had two black teachers, but teachers don’t shout at one another. So I have absolutely no experience with how black people calm down after being angry. I simply don’t have a large enough data set to make any meaningful conclusions. I have to resort to the very limited experience I have. So if I were the judge and two angry big black lawyers were shouting at one another, I would press the panic button. But since I have a lot of experience with angry white people, I wouldn’t push the button. In my experience, angry white people rarely resort to violence.

So we can safely conclude that the judge in that case was racist, and we can safely conclude that I am a racist. I’m not a hateful person, and I doubt if the judge was either. We simply make judgments based on what we observe, and based upon our personal experiences.

We now turn to the photo of the mayor of Minneapolis and an African-American man. After giving the matter a little thought, I have come to the conclusion that the two are engaged in a behavior known as “pointing at one another.” I have noticed that politicians like to point at people. For example, when I saw Sen. Dave Thompson at the State Fair, I waved at him. Since he’s a politician, he did what politicians often do:  He pointed at me. Other politicians have pointed at me, and I’ve seen politicians point at other people. If a photographer had captured a picture of Sen. Thompson and me, there would be little doubt about what was going on. Everyone would agree that he was pointing at me. It wouldn’t be particularly newsworthy, because we’re all used to seeing white people point at other white people.

But when I first saw the picture of the mayor pointing at an anonymous black person, that wasn’t my first reaction. My first reaction was, indeed, that she was foolishly “flashing a gang sign.” I had this reaction because I was a racist, in the sense that I have no experience (certainly no experience in the first 18 years of my life) of black people pointing at one another. My only experience with black people using hand gestures is what I’ve seen on TV. So I used my experience to judge the situation, and I quickly came to the conclusion that she was “flashing a gang sign,” probably after having been goaded into doing so.

It turns out I was wrong, but that was my initial reaction. I thought it was a gang sign, because I’m racist. I would have pushed the panic button in the courtroom, because I’m racist. So it is indeed a correct conclusion if you say that the judge was racist, or that KSTP was racist, or that Jay Kolls was racist, or that I am racist.

But it’s a big mistake to stop there. Because it’s safe to say that you are also racist. You have your own life experiences, and you also use those life experiences to make judgments. Usually, those judgments are correct, but sometimes they are wrong. And because your experiences are skewed toward those of your one race, this means that some of your judgments are racist. You’re not evil and you’re not hateful. But you are racist. Therefore, very little is accomplished by simply branding me, or KSTP, or Jay Kolls as being racist. Very little is accomplished by lumping us in with the guy who shot Martin Luther King or even the kid who muttered “dumb n—–” about the teacher.

If you want to hear more, feel free to download the podcasts of my “elimination of bias” CLE program. If you’re a lawyer, you can get 2 CLE credits for $20. But there’s no cost to listen to the podcast.


1940 Armistice Day Blizzard

Armistice Day Blizzard, Excelsior Blvd., West of Minneapolis.  Minn. Historical Society photo, NOAA.

Armistice Day Blizzard, Excelsior Blvd., West of Minneapolis. Minn. Historical Society photo, NOAA.

For many, the eleventh day of November is remembered as Armistice Day or Veterans’ Day. In Minnesota and much of the Midwest, it’s also remembered as the date of the Armistice Day Blizzard of November 11-12, 1940.

The storm came up quickly and was responsible for 145 deaths, including 49 in Minnesota. About half of those 49 were duck hunters who froze to death, unable to escape the sudden storm.

MilwAdThe severity of the storm was largely unpredicted. The newspaper forecast in the Milwaukee Sentinel was typical of that appearing in Midwestern papers. It called for “cloudy with occasional rain in south and rain or snow north; colder Monday (the 11th); Tuesday (the 12th) cloudy, possibly snow flurries and colder.” Ironically, that paper included the  advertisement shown here for overcoats, warning, “you can never depend on Milwaukee weather,” and “there’ll come a day, not so very far away, when scenes like this will be commonplace all around town.”

Those scenes came to the Midwest much faster than anyone expected.  Within hours, temperatures were dropping, massive amounts of snow fell, and winds caused peril to those on both land and water.

The storm disrupted communications through much of the region, as telephone and telegraph lines were taken down by the fierce winds.  As might be expected, Amateur Radio operators stepped in to fill the need, as reported in QST for January, 1941.  Hams provided communication to the railroads, the Red Cross, and especially for private citizens, since broadcast stations broadcast the telephone numbers of local hams who could relay messages to towns cut off by the storm.  Minneapolis Ham George H. King, W9OTE, reported that his phone rang constantly with requests from worried families, with his wife unable to prepare dinner because of the constant calls.

A couple of familiar names appear in the QST article.  The first was Stanley L. Burghardt, W9BJV, of Watertown, S.D., who contacted the families of dozens of Watertown residents who were stranded in Minneapolis.  Burghardt’s call later became W0IT, and is famous among Hams as the owner of Burghardt’s Amateur Center in Watertown.  Burghardt’s antenna collapsed in the blinding gale, forcing him to go outside to effect a repair that held until the storm ended.

Another familiar name in this story was that of Sherman Booen, then of Albert Lea, MN, W9HRT. He reported that most of the wire facilities in Albert Lea had been wiped out, and he reported that 75 meters was a beehive of activity. He reported that he went to bed, but at 10:30 PM, a railroad dispatcher in Albert Lea called him. The dispatcher had been unable to contact his chief in Minneapolis, and needed to get through for permission to start a snowplow north. Booen was able to get that message through in ten minutes. A total of 15 railroad messages were relayed by Booen.

The name Sherman Booen is familiar to many Minnesotans. After the war, his call sign became W0RHT, and he was a well-known Ham. He was also an aviator and broadcaster, and best known as the host for 28 years of “World of Aviation” on WCCO-TV in Minneapolis. He passed away in 2011 at the age of 97, having been licensed as a Ham since 1934.

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Destruction of the Emden, 1914

Emden

A hundred years ago today, November 10, 1914, the American papers were all reporting the sinking of the SMS Emden in the Cocos Islands. The headline shown here is from the New York Evening World.

Upon learning of the assassination of Archduke Franz Ferdinand, her captain, Karl von Müller, anticipated war and prepared for commerce raiding in the Indian Ocean. He captured a Russian freighter soon after the outbreak of hostilities, and continued to operate in the region, terrorizing allied commerce, capturing almost two dozen ships. In October, Müller decided to attack the British coaling station in the Cocos Islands, which was equipped with a wireless station. Müller’s intention was to destroy the wireless station, and also attempted to jam the signal. But the station was able to get out a message that an unidentified ship was off the entrance of the harbor. The Australian cruiser HMAS Sydney was only 60 miles away. The Emden picked up the Sydney’s wireless signals, but believed that the Australian ship was much further away.

The Sydney’s six inch guns were able to inflict serious damage to the Emden. The Emden was ultimately beached, and scrapped in the 1950’s. A raiding party had already landed on the island, and was left to its own devices. The landing party seized another ship and sailed to Yemen, which was then part of the Ottoman Empire, an ally of Germany.

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A Toy TV for Half the Price of a Real One

PhonoViewer

Fifty years ago this month, the November, 1964, issue of Radio-Electronics magazine
announced the debut of a “new educational toy in the spirit of TV,” the General Electric Show ‘n Tell Phono Viewer. It consisted of a phonograph, capable of playing all speeds of records (16, 33, 45, and 78). It also conntained of a slide viewer which displayed special film strips that were available synchronized with the accompanying record. The slides advanced mechanically, timed by the rotation of the turntable. According to the article, a 3-year-old child would be able to load both the record and slide. (This was back in the day when parents weren’t overly paranoid when it came to entrusting 120 volt devices to their three year olds.)

The original selling price was $29.95. I vaguely recall seeing these, but they didn’t offer much fascination. This is probably because real TV’s started at $59.95. No matter the retailer, the least expensive television was invariably $59.95. This amount was never attainable, but it always seemed to be within reach. If I had ever come into possession of $29.95, I doubt if I would have considered squandering it on a toy TV, no matter how ingenious, knowing that I was halfway to being able to purchase a real one.

The device can be seen in action at this YouTube video.


1914 Pathescope Ad

pathescope

As far as I know, there was never widesperead adoption of having a motion picture projector in the home. But it was marketed that way, as shown by this Pathé advertisement in the New York Tribune a hundred years ago today, November 8, 1914.

According to the ad, the question raised by many buyers was how they would get films to view. The ad reassured potential buyers that “literally everything of real interest, all over the world, is reporduced by motion picture,” and that new films are added daily. Old films could be exhanged for new ones at a small charge, and “every night of the year you can have your own motion picture show at home.”

While the ad’s prediction about the home market never quite worked out, the prediction about schools was probably more accurate: “Before long a school will no more be without a Pathescope than without a blackboard.” The ad also notes that the New York Tribune had purchased twenty of the projectors to be awarded to local schools.


Why the Mississippi River Flows Uphill

MississippiFlowsUphill

This interesting illustration from the June 1921 issue of New Science and Invention demonstrates that the Mississippi River (or any river flowing toward the equator) actually flows uphill. The Earth is not a perfect sphere. There is an equatorial ring about 13.5 miles deep. In other words “sea level” is not constant. It is higher at the equator than it is at the poles.




In the case of the Mississippi, sea level at the mouth of the Mississippi is 6,373,159 meters from the center of the Earth. Sea level at the source of the Mississippi is 6,366,524 meters. The difference is 4.12 miles. The source of the Mississippi, Lake Itasca, is 1400 feet above sea level, and the mouth is, by definition, zero feet above sea level. So we think of all of that water flowing downhill 1400 feet. But it is actually flowing against the force of gravity, going four miles uphill. The force that keeps the water flowing is actually the centrifugal force of the earth’s rotation.

If we did measurements of the flow of the water, only the effect of gravity would be observable. But that’s only because we’re using “sea level” as our reference in the first place. And the difference in sea level is itself caused by that same centrifugal force. So its effect is cancelled out in the measurements that we make.

To put it another way, if we lowered Lake Itasca by 1400 feet, then the water in the river would stand still, even though the New Orleans end was four miles higher.  It would be held in place by the Earth’s rotation.  When we raise Lake Itasca, the much smaller additional force of gravity is what causes the actual motion of the water.  Counter-intuitively, the gravitational force is much smaller than the centrifugal force.  This is demonstrated by the fact that the centrifugal force lifts not only the water, but also the entire crust of the Earth, more than 13 miles at the equator.

If we were to stop the rotation of the earth, the centrifugal force would disappear, and gravity would take over. The water would be drawn toward the center of the earth. In the case of the Mississippi, the water in New Orleans (and all of the ocean water behind it) would flow downhill the four miles to Lake Itasca.

(And yes, for the purists, I’m already aware that there’s really no such thing as centrifugal force.)

References

NOAA, Geodetic Bench Marks, Appendix B:

Many people are willing to accept a sphere as being a suitable geometrical figure of the earth. This, however, can lead to some patent absurdities if carelessly applied to the principles of levels. There is the case of the flow of the Mississippi River. Considering the 1535 kilometer section from the mouth of the Ohio River (Cairo, Illinois) to Head of Passes, Louisiana, engineer’s levels indicate that the mid-stage elevation of the water surface drops approximately 91 meters…. This agrees with common sense but, to the unwary, is a bit difficult to reconcile with the fact that Head of Passes is 2643 meters farther from the center of the earth than the Mississippi River is at Cairo, Illinois. This could lead to the conclusion that the river is running uphill at a rate of 1.7 meters per kilometer, instead of downhill at a rate of 6 centimeters per kilometer. (The explanation of this absurdity lies in the fact that the meridional section of the earth is approximately elliptical.)

This can, of course, be countered by the engineer with the statement that he never meant for his levels to define the distance of a point from the center of the earth. When pressed for another definition, he will mutter something about height above “Mean Sea Level.” This can, however, be an elusive concept unless carefully defined.