"Old Colony Laundry. Ford Motor Co." Washington, D.C., in 1924, when the streets were a honking sooty gridlock of trucks delivering diapers, blackberry pie and Whistle. Note the integrated, state-of-the-art turn signal attached to the cab. National Photo Company Collection glass negative. View full size.

Washington again, circa 1920. "Holmes Bakery truck. Ford Motor Co." A sight sadly missing from the streets of our nation's capital lo these many years: big trucks delivering fresh blackberry pie. View full pies. National Photo Company.

Washington, D.C., circa 1928. "Dixie Soda Fountain Company. People's Drug Store No. 40." National Photo Company glass negative. View full size.

"C&P Tel. Co. girls." More Chesapeake and Potomac "telephone girls" from 1928. View full size. National Photo Company Collection glass negative.

"Edwards boy at house where Lincoln died. 1920 or 1921." The ever enigmatic "Edwards boy" sees the sights in Washington. View full size. National Photo Co.

"Saks Fur Co. 1920 or 1921." Wintertime window display at the Washington, D.C., furrier featuring a taxidermy tie-in with the movie "Isobel, or the Trail's End." National Photo Company Collection glass negative. View full size.

The Francis Scott Key Bridge over the Potomac under construction circa 1920. View full size. National Photo Company Collection glass negative.

Washington, D.C., 1923. "Whistle Bottling Works." Yet another outpost in the Whistle beverage empire. View full size. National Photo Company Collection glass negative. Somehow I can envision a musical based on this place. Kind of like "The Pajama Game," but instead of sleepwear, soda pop. And of course whistling.