Category Archives: Television History

1947 TV Census

1947SepOctTeleviserSeventy years ago, television was just getting off the ground, and the September-October 1947 issue of Televiser magazine gives this interesting snapshot of the number of televisions in existence at that time.

The magazine estimated that there were 93,151 sets in existence in the country.  At this point, most of the numbers were fairly exact, since the limited number of manufacturers allowed them to report the exact number manufactured.

One wildcard was the limited number of prewar sets still in use, but this was also relatively easy to estimate.

One wildcard was the number of homemade and kit sets in use.   Stations were hearing more and more reports of “stations becoming increasingly aware of unspecified numbers of home-built receivers” tuning in their signals. The magazine provided a “conservative” estimate of 10,000.

New York was still the hotbed of television, with 51,500 sets, over 40,000 of them in private homes.  An additional 4000 were installed in bars, with more than 7000 on the dealer’s shelf.

Philadelphia weighed in next with 11,000 sets in use.  Washington had 3000, and the TV phenomenon was just starting to move to Baltimore, with 10 sets in homes, with an additional 90 in the hands of dealers.

 



1957 Wireless TV Sound

1957OctPS1

Sixty years ago, domestic tranquility was restored in this household, as shown in this picture from the October 1957 issue of Popular Science.  Dad and Junior can watch the fight, while Mom and Little Sister work on the piano lessons.

This major breakthrough was accomplished after extensive testing by the editors of the magazine. Every TV owner had been waiting for the good news: “a simple way for each member of the family to turn the sound off or on, to suit himself, without annoying anyone else.”

The magic that made this possible was the inductive loop. Because the headset was wireless, “there’s no dangling cord to tether you to the console.” The headsets could be made in a couple of hours, and the magazine proposed three varieties.

1957OctPSLoopThe modification of the set and the installation of the loop was an almost trivial matter.  The magazine warned to unplug the set and let it sit for 15 minutes “for the tubes to cool off” (and hopefully for the electrolytics in the power supply to lose some of their charge).  Then, the lead to the speaker was snipped and hooked to the inductive loop, as shown here.  The magazine recommended adding the closed-circuit jack shown in the circuit here, so that the loop could be unplugged on those occasions when the speaker was desired.

The loop could be run under the carpet, as shown here, tucked away near the ceiling, or even placed in the joists in the basement below.  While reception was best when the headsets were at the same level as the loop, the magazine’s tests showed that any of these arrangements would work well.

1957OctPS2This loop formed the primary winding of a room-sized audio transformer.  The secondary windings would be in the individual headsets.  For the kids, the magazine recommended the spaceman style shown here, with the assurance that the kids would love them.

As revealed by the diagram below, these headsets were simplicity itself.  The coil was worn around the head, and hooked directly to the headphones.  The magazine suggested that Mom should be put in charge of suitably decorating the loop with colored tape.  No other electronics were necessary for these headphones for the kids.  The output of the coil was sufficient to drive the headphones.

1957OctPSHeadset

Mom and Dad warranted somewhat more discrete looking receivers, and these could be either of the models shown below.  Mom had a version similar to the kids’ version, but the loop was not worn.  It was apparently thought that she could set it in a convenient spot, and it was hooked directly to a small earphone.  The magazine noted that the earphone was so small that it could hardly be seen.  The only problem that might result would be forgetting to take it off before going to bed!

1957OctPSReceivers

Dad is seen using a slightly more complicated version, but still easily within the capabilities of anyone able to wire up a lamp cord.  It used a much smaller coil, amplified with the venerable CK722 transistor.  It was the size of the proverbial pack of cigarettes, and the two penlight batteries would keep it running for a thousand hours.

Those wishing to duplicate this idea today can save a great deal of coil winding time by using a telephone pickup coil instead of winding the coils for the individual receivers.  If a set of high-impedance headphones is available, it could be fed without any electronics.  The CK722 is more or less unobtainium, except at very high prices.  But any small audio amplifier could be put into service.  If you want to make your own, hundreds of circuits are available using the readily available 2N2222 transistor.

 

 



1947 Crosley Spectator

1947Crosley

Seventy years ago, television was finally becoming a reality. The war was over, stations were coming on the air, and the enlightened radio dealer was getting ready to move into television. Crosley, the pioneer in radio manufacturing and broadcasting, had also made the move to television.  The Crosley Spectator is shown here, from the August 1947 issue of Radio & Appliance Journal.

The set boasted an image size of 6-3/8″ by 8-1/2″, had 27 tubes and three rectifiers, and tuned all 13 channels, 44-216 MHz, including the elusive channel 1, which was never put to use.

Those 27 tubes consumed 380 watts, and the set weighed in at 85 pounds.

The ad assured the dealer that the Spectator in the shop window as its own salesman, and each set sold would become the talk of the neighborhood and draw in even more business.

You can see a nicely restored example of this set in operation at this video:



The Dark Side of Sunspot Cycle 19

1967AugRadioElecSixty years ago, solar activity was at an all-time high, and the sun was plastered with sunspots. This was good news for hams, who depend on this solar activity for ideal radio communications on the high frequency bands. But in addition to being literal dark spots, this was, figuratively a dark time for the hapless TV repairman in fringe areas, because it fell upon him to explain to his customers that their interference woes weren’t his fault, but were instead caused by blotches on the sun.

Fortunately, the TV repairman got some sympathetic advice from this article in the August 1957 issue of Radio Electronics.

It starts by noting that Sunspot Cycle 19 was about to reach a peak, which was good news for hams and shortwave listeners, for whom shortwave propagation would be better than at any other time in history.

But the average TV owner “probably does not care about receiving Havana, Cuba, or some other distant TV station over his favorite local channel,” which was a distinct possibility in fringe areas. The article noted that this would be particularly an issue for channels 2, 3, and 4.

The article counseled the serviceman on how to deal with these calls. And unfortunately, there was little that could be done, other than to “explain to the owner what is happeninng and that the condition will probably pass in a short while. Ask him to call the next day if the trouble is still there.”

The article suggested that a good way to educate the customer would be to draw a sketch of the earth and ionosphere as shown above. While reorienting the antenna might help in some cases, the best advice was to hope that the owner understood what was happening. If the customer understood, it would make him “less likely to call a service technician and thereby leave the technician more time to devote to true television troubles.”

 



1957 Underwater TV Camera

1957JuneRadioElecCover

Shown here on the cover of the June 1957 issue of Radio Electronics is a demonstration of an underwater TV camera, namely a special version of the Hancock Vicon IV made by HEC Corp., Redwood City, California. The camera was housed in a stainless steel cylinder with a small window on one end.

The camera itself was billed as extremely sensitive and not requiring additional lighting in most situations. The entrie camera weighed 95 pounds on land, but dropped to 12 pounds in the water. It came with a 500 foot cable, and could either be maneuvered by a diver or lowered by crane.

One valuable application was said to be in offshore oil drilling, or for inspections of canals, dams, irrigation canals, and ship hulls.

The original customer was the Department of the Interior, Fish and Wild Life Service, for underwater exploration of marine life. The Navy’s bureau of ships had also placed an order for hull inspection and salvage operations.

The camera, compatible with U.S. broadcast standards, came with a 500 foot cable leading to the associated controls and monitoring equipment.



1927 “Phonoscope”

1927JuneRadioNews

This cover illustration from the June 1927 issue of Radio News is more or less self-explanatory. But unfortunately, there’s little in the way of explanation given in the magazine, and I’m not aware of this form of video recording ever having been done in practice.

The early mechanical television signals were indeed, sent over the audio channel of AM broadcast stations, so it’s not far fetched to think that the audio could be recorded on a phonograph disk. I think the main problem would be the frequency response of the disk recording. As far as I know, the upper frequency limit for 78 RPM records, especially during that era, was around 5 kHz. I doubt if much video could be packed into 5 kHz bandwidth.

The magazine mentions, with no technical detail, only that John L. Baird was then working on the system, which he called “Phonoscope.”



1947 Toy Telephone Crystal Set

The Twilight Zone Lili Darvas Billy Mumy 1961.jpg

Twilight Zone “Long Distance Call” 1961. Wikipedia image.

You might recall the 1961 Twilight Zone episode “Long Distance Call.”  If you don’t recall, five-year-old Billy received a toy telephone from his grandmother, who then promptly died.  After her death, Billy continued to receive “pretend” phone calls from her, in which she encouraged him to join her in the hereafter.  Finally, the father stepped in, picked up the toy phone, and told Grandma, in no uncertain terms, to knock it off.

We offer a possible explanation from just

Youngster listening to 1947 toy phone, presumably tuned to strong local station.

Youngster listening to 1947 toy phone, presumably tuned to strong local station.

fourteen years earlier, in the June 1947 issue of Popular Mechanics.  That article showed how to convert a toy telephone, which looked just like Billy’s, into a crystal set.

According to the article, Daddy really made a hit with his youngster by doing the conversion, and the youngster was, indeed, able to hear voices through the toy telephone, in the form of a pre-tuned local radio station.

The conversion entailed use of a 1N34 diode, and tuning was accomplished by a premeability-tuned coil. Dad presumably preset the tuning to the strong local station, although I suppose it’s possible that he accidentally tuned it to the hereafter. The earphone that the author was able to find was a war surplus low impedance unit, necessitating the addition of an audio output transformer.

Billy's telephone just 14 years later. Coincidence?

Billy’s telephone just 14 years later. Coincidence?

1947JunePM2



“How Great Thou Art” Comes to America, 1957

1957HowGreat

Shea performing in 1957. YouTube image.

If you’re like me, you probably assumed that the hymn How Great Thou Art has always been a part of the American religious music scene.  However, it is actually relatively new, being first popularized only sixty years ago, in 1957.  It was performed for the first time by George Beverly Shea at Billy Graham‘s Madison Square Garden Crusade, which began on this night 60 years ago, May 15, 1957. The crusade lasted until September 1, and during its run, more than two million persons attended to hear Graham preach and Shea sing. Over 56,000 reportedly  responded to the message by making a decision for Christ.

In the video below, Cliff Barrows describes it in his introduction as “a new hymn to American audiences.” The hymn was not exactly new when Shea brought it to American audiences. The tune was a traditional Swedish melody. The Swedish lyrics, “O Store Gud” were penned in 1885 by Carl Boberg, who was inspired while walking home from church listening to church bells. A sudden storm was followed by a similarly sudden calm. According to Boberg, the words were a paraphrase of Psalm 8:

Lord, our Lord,
how majestic is your name in all the earth!
You have set your glory
in the heavens.

The first translation of the hymn was into Russian in 1912, “Velikiy Bog” (Великий Бог – Great God) by Ivan S. Prokhanov. It was published in a Russian Protestant hymnal in 1927.

The first English translation came in 1925 by E. Gustav Johnson, who made a literal translation of the Swedish lyrics published in the Covenant Hymnal as “O Mighty God.” Those words remained as late as the 1973 edition:

O mighty God, when I behold the wonder
Of nature’s beauty, wrought by words of thine,
And how thou leadest all from realms up yonder,
Sustaining earthly life with love benign,

With rapture filled, my soul thy name would laud,
O mighty God! O mighty God!

Credit for the now familiar English lyrics goes largely to British Methodist missionary Stuart Wesley Keene Hine, who heard the hymn sung in Ukraine in 1931. He did a paraphrase of the Russian translation, which includes most of the familiar lyrics, as well as the title, “How Great Thou Art.”

Hine finalized the lyrics in 1949, and he performed it for the first time at a convention in New York in 1951. It was first published in 1956, in the collection “Eastern Melodies & Hymns of Other Lands.”

The hymn soared in popularity after Shea’s 1957 performances at the Madison Square Garden Crusade.  It’s unclear whether the hymn was performed on the first night of the crusade 60 years ago tonight, but it was performed at most of the services.

 

For comparison, here is the Swedish version:

And the Russian:



1937 Electronic TV Receiver

1937MayRadioNews

Eighty years ago this month, the May 1937 issue of Radio News carried an ambitious construction project, this television receiver. TV receivers had been popular projects in earlier radio magazines, but the earlier ones were all mechanical televisions, employing a spinning Nipkow disk.

This set was all electronic, employing a cathode ray tube.  The construction article did not have an individual byline.  Instead, it was attributed only to “the Don Lee Television Staff,” referring to the Los Angeles broadcaster and licensee of W6XAO.

W6XAO image taken off the air.

W6XAO image taken off the air.

The plans for this set were also included in other magazines, and the broadcaster also made it available in kit form.

While the receiver was all electronic, it appears that the camera was still a mechanical device.  A spinning disk was used to produce a flying spot to convert previously filmed footage to a video signal.  Shortly thereafter, the station appears to have adopted an electronic camera.

The set, including both RF and video sections, contained a total of 14 tubes in addition to the CRT.  It did not contain an audio section.  Presumably, accompanying audio was received on a separate radio receiver.



1932 Lens Disk Television

1932MarAprTV85 years ago this month, the televisionist shown on the cover of the March-April 1932 issue of Television News is working on a rather ambitious project.  He’s graduated from the tiny peep-hole sets to a larger set capable of displaying an image of 10-12 inches.

The secret to this ambitious design is the fact that it incorporates 60 matched lenses in the spinning disk itself, rather than merely relying on small holes cut into the disk.