August 24, 1929. "Donald H. Brooks, Bureau of Standards." View full size. National Photo Company Collection glass negative. So -- what's he doing?

"Howard M. Gore. February 26, 1924." Mr. G, secretary of agriculture in the Coolidge administration, was later governor of West Virginia. And evidently kind of a geek. View full size. National Photo Company Collection glass negative.

Electrical circuits and motors at Howard University in Washington, D.C., circa 1925. View full size. National Photo Company Collection glass negative.

"Ansell, Bishop & Turner window display. 1920." A Victrola dealer in Washington, D.C., puts Nipper in the game. View full size. National Photo Co. glass negative.

"Washington, D.C., Industrial Exposition 1926. Hopkins Titanafram." Here's a fascinating glimpse back to a time when titanaframs were the size of sombreros. National Photo Company Collection glass negative. View full size.

My brother's do-it-yourself hi-fi. From Top: tweeter, woofer, Webcor portable phonograph, Heathkit amplifier. One of his high school buddies assembled the Heathkit for him. He took this in the upstairs bedroom we shared until a year or so later. That's my bed on the right. Check out our cool wallpaper. View full size.

1925. "Condenser assembling department." Another view of workers putting radios together at the vast Atwater Kent factory in Philadelphia. View full size. National Photo Company Collection glass negative, Library of Congress.