1974 Grocery Prices

1974JanAPFor a snapshot of grocery prices 50 years ago, this ad for A&P appeared in the Pittsburgh Post-Gazette on January 16, 1974.

The prices look like a bargain, but there’s been a lot of inflation in 50 years. According to this online inflation calculator, one dollar in 1974 is the equivalent of about $6.18 in today’s money. If you wanted a fast dinner, you could buy the Freezer Queen two pound package of Charcoal Beef Patties for $1.49, and a package of frozen vegetables for about 22 cents (4 for 89 cents). For the side, you can get a loaf of bread for about 33 cents (3 for a dollar). The Kroger ad in the same issue of the paper shows that margarine is also 33 cents a pound. For desert, you can have ice cream for $1.19 a gallon, and coffee, $1.59. So the cost to feed a family (with food left over) would be $5.15, or about $32 in today’s money.

If you were in a hurry, you could get the 13 ounce frozen pizza for 69 cents, and an 8 pack of Coke for 89 cents, for a total of $1.58, or almost $10 in today’s money.

If you were shopping for dinner in 1974, what would you buy?



Science Fair Idea: Weighing Gas

Screenshot 2023-12-31 4.08.04 PMIf Junior is looking for an easy-to-construct science fair project, this one from the January 1939 issue of Popular Science is certain to bring home the blue ribbon. It answers the question of whether gasses can be weighed.

Junior should carefully construct two boxes made of paper, and make them into the balance shown here, so that the slightest weight tips the scale. Then, some invisible gas is poured into one of the boxes, and that side of the scale moves down, demonstrating that the invisible gas is, indeed, heavier than air and can be weighed.

As for the gas to use, the magazine recommends carbon tetracholoride. Of course, that’s dangerous stuff, and would result in the hazmat team shutting down the science fair. Instead, for almost as good a reaction, some carbon dioxide gas can be quickly produced by mixing a little vinegar and baking soda in a tall glass. We showed how to do a similar experiment in an earlier post, and Junior might want to do both.



Police Radio Car, 1924

1924JanRadioNewsFor the last hundred years, criminals might have been able to outrun the police, but they can’t outrun the radio, as shown by the cover of Radio News, January 1924.

The accompanying article by Armstrong Perry describes this radio car employed by Scotland Yard. While the truck runs at 40 MPH, the officer in back can chat with headquarters, other cars, or even an airplane overhead. The receiver had six tubes, and the transmitter was said to get out 30 miles.



1924 Crystal Set

Screenshot 2023-12-30 5.07.16 PMOne hundred years ago this month, the January 1924 issue of Popular Mechanics showed how to put together this simple crystal set, which had been submitted by one F.L. Brittin of Chicago. In the 1950s and 1960s, it appears the Brittin went on to become the magazine’s radio editor.

The set was said to cost about 65 cents to build, and had excellent results pulling in stations up to 20 miles away. The honeycomb coil is homemade, and the insulation is carefully removed along a path for the slider, which tunes in the stations.

If you want to duplicate this design, be sure to check out our crystal set parts page.



Eclipse Information

If you are looking for eclipse information, you’ll find all of our eclipse posts at this link.  If you’re looking for eclipse glasses, visit our sister site, MyEclipseGlasses.com.  Individual pairs are only $3.99, which includes free shipping anywhere in the world.  We also have larger quantities at even lower prices.

On The Radio 1924

1924Jan11WashTimesA hundred years ago today, these were your choices for radio listening, according to the January 11, 1924, issue of the Washington Times.

At 6:15 PM, for example, you could tune in an organ recital on KDKA Pittsburg on 326 meters (920 kHz). Or, if you preferred, WOR in Newark was running a lecture on Mouth Hygiene on 405 meters (741 kHz).

At 10:30, you could pull in Paul Specht and his orchestra on WJZ, New York, 455 meters (659 kHz). If you happened to have missed the show, you can buy his CD on Amazon.



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1939 Combination Radio-Lamp

1939JanPSThis woman appears to have a high level of admiration for her lamp. And the admiration is well deserved, since it’s not just a lamp. Instead, it has a four-tube radio receiver in its base, with the loudspeaker at the top. A single plug-in cord provided power to both the radio and the lamp, and the lamp was available in several color combinations.

It was shown 85 years ago this month in the January 1939 issue of Popular Science.



1939 British Two-Tube SW Receiver

1939JanPracMechEighty-five years ago this month, the January 1939 issue of the British magazine Practical Mechanics carried the construction plans for this two-tube shortwave receiver.  The exact circuit is a little hard to follow, since the magazine included no schematic diagram.  Instead, only the pictorial diagram below is shown.  But the left knob served as coarse tuning, with the center knob for fine tuning.  The control on the right appears to control regeneration.

1939JanPracMech2



1939 Electrical Prediction

1939JanPracMechEighty-five years ago, the January 1939 issue of the British magazine Practical Mechanics predicted that, someday, appliances will be equipped with three-prong plugs to avoid the situation shown here. In the meantime, I hope British housewives kept one hand in their pocket while ironing.



1944 32-Volt Receiver

1944JanRadioCraft11944JanRadioCraft2Eighty years ago this month, the January 1944 issue of Radio Craft carried this circuit for a receiver to run directly from 32 volts. Specifically, a reader requested a circuit that would “work from a 32-volt lighting system.” The circuit used three tubes, 1T4, 1S5, and 1S4. The filaments were in series with a 550 ohm resistor, and 32 volts was sufficient for the B+.

The “32-volt lighting system” was undoubtedly a Delco Lighting Plant, designed for lighting up the farm. It consisted of a motor generator which charged 16 2-volt batteries. The generator would kick in automatically when the batteries needed charging, and shut off when they were fully charged.

The only mystery here is the reader’s return address, New York City. While some parts of the city had DC power at the time, it was 110 volts. He must have been designing the circuit for someone on the farm without electric service.