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Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.

 
 
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VINTAGRAPH • WPA • WWII • SYPHILIS ... SIX OUT OF TEN CURED, 1941

Now Hear This: 1922

Now Hear This: 1922

1922. Washington, D.C. "Radio at District jail." Programming for a captive audience. Harris & Ewing Collection glass negative. View full size.

 

On the hat!

On his hat, the symbol for mu is the giveaway for Doctor Mu.

Dr. Mu's radio advert

That old advertisement is quite cool.

In vacuum tubes the amplification factor (gain) of a tube was measured in MU . High gain = high mu

At the bottom it says "The Sine of GREBE RADIO The Right Kind".. a play on the word SIGN but referring to the RF sine wave that an AM radio received. The sine wave contained the high frequency RF component (GREBE RADIO) and the low frequency audio component (the big sideways "S" underlining the words.

Well played, Dr. MU ... well played !!

Dr. Mu's radio

The famous Grebe CR-9 radio receiver from 1921.

I wonder

if they're playing an early recording of Jailhouse Rock

 
THE 100-YEAR-OLD PHOTO BLOG
Shorpy.com | History in HD is a vintage photo blog featuring thousands of high-definition images from the 1850s to 1950s. The site is named after Shorpy Higginbotham, a teenage coal miner who lived 100 years ago.

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