SHORPY Historic Photo Archive & Fine-Art Prints
The Shorpy Archive
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About the Photos

Our holdings include hundreds of glass and film negatives/transparencies that we've scanned ourselves; in addition, many other photos on this site were extracted from reference images (high-resolution tiffs) in the Library of Congress research archive. (To query the database click here.) They are adjusted, restored and reworked by your webmaster in accordance with his aesthetic sensibilities before being downsized and turned into the jpegs you see here. All of these images (including "derivative works") are protected by copyright laws of the United States and other jurisdictions and may not be sold, reproduced or otherwise used for commercial purposes without permission.

© 2018 SHORPY INC.

[REV 25-NOV-2014]

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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 Shorpy:
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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

SHORPY HISTORICAL PHOTO ARCHIVE | History in HD is a vintage photo archive featuring thousands of high-definition images from the 1850s to 1960s. (Available as fine-art prints from the Shorpy Archive.) The site is named after Shorpy Higginbotham, a teenage coal miner who lived 100 years ago.

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