FDR Wins Third Term, 1940

Seventy-five years ago today, November 5, 1940, it was the first Tuesday after the first Monday in November, and Roosevelt was elected to an unprecedented third term as President.

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Huffy Radiobike, 1955

1955Radiobike

Sixty years ago this month, Boys’ Life magazine, November 1955, carried an ad for this product.  It was almost certainly coveted by many of the readers, and I’m certain that Santa was flooded with requests for it that year.  It was the Huffy Radiobike:  A bicycle with a radio built in to the “tank”!   The ad promised that the radio was no toy, being rain-proof, tamper-proof, and shock-proof.  “You can drop your bike on the walk if you want to . . . but you probably won’t want to.”  The bike itself was well made, of the best materials, strong, speedy, and safe.

The ad also warned readers that “only one in ten thousand will have a Radiobike this Christmas.  Many stores will have only a handful all fall.  So the smart boy, or his dad, will call a Huffy dealer or write the Huffy Manufacturing Co. for catalog and dealer’s name, today.”

As noted in the ad, the radio itself was mounted in the “tank” of the bike and was a three-tube superhet, apparently manufactured by Yellow Springs Instrument Co. About 8500 units were manufactured. A schematic diagram of the radio is available at this link.

The tubes in the set were reflexed, with a 1R5 serving as converter, a 1U5 serving as IF amp, detector, and the first stage of audio, with a 3V4 serving as the final audio amplifier. The set was powered by a battery pack mounted behind the seat.

More information about the set can be found at nostalgic.net.

 

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How To Get Yourself Down From a Cliff

1915SheepshankIf you ever find yourself stranded on a high spot with a rope, you’ll appreciate this trick. Of course, you know that you can tie the rope to something sturdy and then climb down. You probably assumed that you would need to abandon the rope.

But thanks to this trick which appeared in Popular Mechanics a century ago, November 1915, you can now retrieve most of the rope.  The trick is to tie a sheepshank knot, which is normally used to temporarily shorten a rope.  First, you secure the rope.  You then tie the sheepshank close to the top.  You will notice that at point C, the rope is not supporting any part of your weight, so you cut the rope at this point.  Then, being careful to maintain tension on the rope, you descend.  After you’re safely on terra firma, you simply give the rope a shake, and most of it falls down beside you.  You’re on your way, and you have all but a small piece of your rope.

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Sinclair ZX80 Computer, 1980

SinclariZX80Ad

Thirty-five years ago this month, the November-December 1980 issue of Elementary Electronics carried this ad for the first personal computer for under $200, the Sinclair ZX80.

The computer was most famous for the membrane keyboard. It was impossible to touch type using this keyboard. One popular modification for later models was the addition of an external keyboard. It contained 1K of memory, some of which was used for the display. This could be expanded up to 16K with an external memory module. As the name implies, it used a Z80 CPU chip, and the ROM came pre-loaded with the BASIC programming language. The output was a monochrome TV signal. Since the computer used the bare minimum of hardware, the generation of the video was handled by software. Therefore, while the computer was actually computing, the screen went blank, which one reviewer noted had the small advantage of letting you know that the computer was actually working.

Program was handled by an external cassette recorder.

In addition to the ad shown above, this issue of Elementary Electronics also carried a review of the computer. It noted that the version of BASIC included was uncommonly extensive and flexible for such a low-cost machine. The review concluded that while the ZX80 was not a substitute for a full-size computer, it was a low-cost way to get into personal computing and learn programming. Indeed, another review pointed out that the cost of the computer was less than a college course in BASIC programming.

A couple of years later, a more familiar version of the computer came on the market as the Timex Sinclair TS1000.  It came on the U.S. market in July 1982. With a retail price of $99.95, it was billed as the first computer under $100. The price soon dropped to $49.95. Competitor Commodore’s VIC-20 was somewhat comparable, but had a full-sized keyboard. When Commodore announced that it would offer a $100 credit for the trade in of $100 on any competing computer, many TS1000’s were sold for the sole purpose of trading in on a Commodore 64.

My first computer was another competitor, the TRS-80 MC-10, which originally came on the market in 1983 with a price tag of $119.95. While designed to compete with the Timex Sinclair and having similar capacities, it did have a number of advantages. While it did not have a full-size keyboard, it did have actual keys, rather than the membrane keyboard of the Timex Sinclair. Also, it had full color and even had some rudimentary graphic capabilities. I bought mine for about $49.95.

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Desmond Doss, Medal of Honor

Seventy years ago today, U.S. Army Corporal Desmond Doss, a conscientious objector, was awarded the Medal of Honor by President Truman. Doss, a devout Seventh-Day Adventist, was drafted in 1942. Because of his religious beliefs, he refused to kill or carry a weapon. He was made a medic in the Pacific Theatre.

When his battalion assaulted a jagged escarpment, it was met by a heavy concentration of artillery, mortar, and machine gun fire, resulting in 75 casualties. Doss refused to seek cover, cared for the men, and carried all 75 casualties, one by one, to the edge of the escaprment where he lowered them on a rope-supported litter. His heroics continued on subesequent days when he rescued injured men forward of the lines.

He was subsequently injured by a grenade, but rather than risking another aid man’s life, he treated his own wounds and waited five hours before litter bearers reached him. Upon seeing a more critically injured man, he crawled from the litter and directed the litter bearers to care for that man first. He was then struck by a sniper’s bullet, suffering a compound fracture. He splinted his own wound before crawling to the aid station.

Shortly before leaving the army, Doss was diagnosed with tuberculosis, which eventually cost him a lung. Doss died in 2006 at the age of 87.

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Elegance in SWL’ing, 1956

1955Grundig

There was a time when people still dressed up to listen to shortwave radio, as demonstrated by this elegant DX’er, undoubtedly tuning in a shortwave broadcast on her Grundig Majestic Pianissimo console. The elegant cabinet, with its natural walnut finish, contained five loudspeakers, an AM-FM-SW receiver, and an automatic phonograph.

This ad appeared in Life Magazine, October 29, 1956. The ad also featured three more consoles tuning the shortwave bands, as well as two table radios. Prices ranged from $69.96 up to $1495, at better stores everywhere.

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How To Get Distant Signal TV Basketball, 1950

The reception problem and the final antenna.

The reception problem and the final antenna.

In 1950, Richard J. Buchan of Bricelyn, Minnesota, was apparently an avid basketball fan, and enjoyed following the Minneapolis Lakers. And he was apparently tantalyzed by the fact that the Lakers were carried on Channel 4 in the Twin Cities (then WTCN-TV), 105 miles to the north. WTCN also carried the state basketball tournament, and Buchan set out on a quest to pull those signals into his living room.

His quest had actually begun when KSTP came on the air on Channel 5 from St. Paul. Buchan was a ham (W0TJF), and “after studying antenna books and experimental charts put out by the FCC,” he came to the conclusion that KSTP would be putting out, at most, a 2.5 microvolt signal as far away as Bricelyn. He also knew that a 250 microvolt signal would be required for solid reception, a whopping 40 dB of gain. He set out on a yearlong quest to get those 40 dB of gain, and a “small set was purchased and connected up.” He initially began working on Yagi antennas and preamplifiers, and described his experimental quest in detail in an article in the October 1950 issue of Radio News.

Since he lacked any test equipment, he rigged a VTVM up to his television to serve as an S-meter, and set about experimenting. The Yagis and preamplifiers he tested were never enough to give him the elusive 40 dB of gain. In particular, to get sufficient gain from the Yagis, he found that the bandwidth was too narrow. If he maximized the gain for the audio, the video suffered, and vice versa. The problems were compounded by the entrance of Channel 4 to the airwaves with the elusive basketball games. He was soon resigned to the need for four Yagis, tuned for sound and picture on the two channels.

Much to his dismay, WOI-TV in Ames, Iowa, came on the air on Channel 4. Unfortunately, Ames was almost exactly 180 degrees away from Minneapolis, meaning that he now also had to worry about the front-to-back ratio of the Yagi. And by designing it for better front-to-back ratio, he lost gain. (Buchan reported that he made no attempt to tune in WOI, since it didn’t broadcast the elusive basketball games. As far as he was concerned, the Iowa station apparently represented nothing other than interference.)

After some more study, he finally decided to abandon the Yagis and instead go with a Rhombic, which would have a theoretically infinite front-to-back ratio, but still have sufficient gain to pull in the elusive basketball games. Fortunately for Buchan, he had a large field across the road where he could install the antenna, which measured 155 feet in length, pointed toward the Twin Cities. Even though the final rhombic was actually lower than the Yagis, it performed well. Other than “an occasional gurgle in the sound,” the QRM from WOI was eliminated.

Presumably, the antenna continued to function well until the Lakers left Minneapolis in 1959.

Buchan, whose amateur call sign expired in 1998, also published more detailed construction details in Rhombic TV Antennas in 1951.

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St. John’s School Fire, Oct. 28, 1915

One hundred years ago today, twenty-one girls between the ages of 7 and 17 were killed in a fire at St. John’s School in Peabody, Massachusetts. Under the school’s established fire procedure, most students were to leave the building through a rear exit. But because the route was blocked by thick smoke, most instead tried to exit through the front door, where they became blocked in the vestibule. A major contributing factor was the fact that the front doors opened inward. The crowded vestibule was soon engulfed in flames, and the entire building was soon fully engulfed.

Most students were able to escape through first-floor windows, or even by jumping from higher windows. The school’s teachers, nuns of the Sisters of Notre Dame, acted heroically, by dropping many of the students to improvised life nets made of coats and blankets.

One lesson learned from this fire was that the exit doors of public buildings need to open out to avoid bottlenecks in case of fire. In the wake of the fire, Peabody became the first city to impose this requirement.

Every school with which I have been involved takes fire safety very seriously, and it is natural to ask the question of how successful these efforts have been. In other words, how often do we see a headline like the one at the top of this page?

The answer is that school fire safety has been extraordinarily successful. In the past half century, zero American schoolchildren have been killed by fires. There have, of course, been fires. But in over fifty years, there has not been a single fire fatality. Not a single one. And when we stop to think of why this is true, we can learn some lessons that will help prevent other tragedies.

The important thing to remember is that we cannot point to a single magic bullet that has prevented school fires. There is no one thing that we did to prevent them. We did a lot of things. And when we did them, we didn’t waste time worrying that we shouldn’t do them because that one thing wouldn’t prevent all fire fatalities.  Nobody would call us paranoid for taking all of those precautions against something that hasn’t happened in 50 years.  And nobody would argue that we shouldn’t take fire precautions because they might scare the children.

In the St. John’s fire, the critical lesson learned was that doors to public buildings should open out. But no sane person would stop there and conclude that by changing the doors on the school that we could prevent fire deaths. We fixed one safety hazard, but continued identifying other hazards. Here are some of the other things we have done for school fire safety over the years:

  • We use fire-resistant building materials.
  • Students and staff have routine fire drills.
  • Firefighters are familiar with the layout of the schools in their area.
  • Exits are well marked and the exit signs have backup power.
  • Adequate fire hydrants are in place near schools.
  • The locations of fire stations take into account proximity to schools.
  • Fire extinguishers and fire alarms are required.
  • Most schools are equipped with sprinklers.

There are probably others that I’ve forgotten. But you get the idea. We haven’t had any fire fatalities because we have multiple redundant layers of protection. And nobody says that doing all of these things makes us paranoid. We’ve had zero fatalities because we do them.

During the same half century of extraordinary success in school fire safety, there have been more than 300 deaths from school shootings.  Security expert Lt. Col. Dave Grossman makes the compelling case that we have to stop being in denial about school violence. Invariably, in the wake of a school shooting, the inclination is to come up with a single solution that will prevent the next one. But we need to take the same approach that we do to fire safety: What we really need are multiple redundant layers of protection. Some of the possibilities suggested by Grossman include:

  • Have an (armed) police officer in the school.
  • Have a single point of entry to the building and classrooms.
  • Have regular drills
  • Allow police officers to carry weapons off duty. Grossman points out that nobody considers it paranoid for an off-duty firefighter to have a fire extinguisher in the trunk of the car when dropping his or her kids off at school. And it would be no more paranoid for a parent who was a police officer to be prepared.
  • Equip all patrol officers with rifles and smoke grenades.
  • Be prepared to use fire hoses to deal with active shooters.
  • Finally, Grossman points out that “armed citizens can help.”

Will any one of these steps prevent every possible school shooting scenario? No. Having a police officer in the school is not the one magic bullet that will prevent every school shooting. Having the responding officer equipped with a rifle in his or her trunk is not the one magic bullet that will prevent every school shooting. And having a handful of random citizens armed is not the one magic bullet that will prevent every school shooting.

But having sprinklers is not the one magic bullet that will prevent every fire death. Having fire drills is not the one magic bullet that will prevent every fire death. Having doors that open out is not the one magic bullet that will prevent every fire death. But we did all of those things anyway, because if we do all or most of these things, then it is very likely that these multiple redundant precautions together will prevent most fire deaths. The last half century of American history proves that this is true.

A hundred years ago, when 21 girls were killed in a school fire, we learned one lesson, but we also kept on learning our lessons. Lessons were learned from the fire at Our Lady of the Angels School in Chicago on December 1, 1958 when 95 were killed. The net result is that we have learned these lessons, and we continue to have multiple redundant layers of security to prevent them. And because those measures have proven so successful, we keep at it.  Nobody says that we’re paranoid.  Nobody tells us to stop because we’ll scare the children.  We simply do what we need to do because it works.

According to findagrave.com, these are the names of the girls killed in the fire a hundred years ago today:

  • Agnes Ahearn
  • Mabel Theresa Beauchamp
  • Helen Theresa Bresnahan
  • Florence Burke
  • Nellie Elizabeth Carty-Burns
  • Patroni Chebator
  • Elizabeth Comeau
  • Catherine M. Compiano
  • Ann Daleski
  • Florence Doherty
  • Mary Ida Essaimbre
  • Mildred Fay
  • Marion Hayes
  • Annie Jones
  • Helen Keefe
  • Annie L. Kenney
  • Mary Elizabeth McCarthy
  • Mary Meade
  • Elizabeth Nolan
  • Annie E. O’Brien
  • Catherine M. O’Connell

At that same site, you can view the statue erected in 2005 in memory of the girls who were killed. It depicts two of them in the embrace of their Saviour.

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1955 CONELRAD Monitor at WRFD

1955WRFDConelradFrom 1951-1963, U.S. broadcast stations were required to participate in CONELRAD, a system designed to alert the public to enemy attack, but also deprive enemy bombers of radio signals which could be used for navigation purposes.  Under a CONELRAD alert, all stations would cease broadcasting on their normal frequencies. Designated stations would switch to broadcasting on either 640 or 1240 kHz.  The result would be that listeners would be able to hear alerts, but enemy bombers would hear only a confusing jumble of signals on those frequencies.

For the system to work, each station needed an alarm.  For smaller stations, this would consist of an alarm tuned to another station in the area.  If the primary station went off the air, then the smaller station would be alerted.  If it turned out to be an actual alert, they would need to leave the air or switch to their designated frequency.  Alarms were available commercially for broadcast stations, and simpler models were also available for hams, who were later required to participate in CONELRAD.  Many hams built their own, and there were many plans published over the years.  Sixty years ago this month, the October 1955 issue of Radio Electronics magazine carried the plans for the unit shown here, which was in use at WRFD, a Worthington, Ohio, 5000 watt daytime only station affiliated with Fram Bureau Insurance, with a format aimed at the agricultural market.

The author of the construction article was Harold Schaaf, the station’s chief engineer, who noted a critical defect in many of the existing CONELRAD alarms.  Most of them depended on a normally open relay which would close in case of an alert.  If the alarm circuit failed for some reason, there would be no relay action.

Schaaf noted that “such a system cannot be considered reliable, since it can go out of order without the operator knowing it.” Schaaf’s circuit instead included a relay that remained energized during normal operation. In the case of a circuit fault such as a failure of one of the tubes, the relay would de-energize, which would cause the alarm to sound, requiring the station operator to investigate. The result was what the title of the article described as a “failure-proof CONELRAD alarm.”

Like most other CONELRAD alarms, this one was hooked to the AVC circuit of a superheterodyne receiver tuned to the station being monitored. As long as there was an AVC voltage present, the alarm would remain silent. If the monitored station went off the air, the AVC voltage would disappear, which would trigger the alarm, which could consist of an external bell.

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