May 19, 1925. "Miss Grace Hazen, Bureau of Standards, testing radio wave meters." National Photo Company Collection glass negative. View full size.

Washington circa 1924. "Bureau of Standards." National Photo Company Collection glass negative, Library of Congress. View full size.

Washington circa 1925. "White House Zero Mile." National Photo Company Collection glass negative, Library of Congress. View full size.

Washington, D.C. January 15, 1926. "Arcade Roller Hockey Club." National Photo Company Collection glass negative, Library of Congress. View full size.

1922. "Surgery #9." One last peek inside the OR before moving on to other things. Next week we'll return. National Photo Company glass negative. View full size.

1922. "Surgery #19." Things have progressed a bit since the previous photo. (Are there more? Yew betcha.) National Photo Co. glass negative. View full size.

1922. "Surgery, #13." National Photo Company glass negative. View full size.

Greater Washington circa 1918. "O'Dell, children's party." Anyone have 90 more candles handy? National Photo Co. Collection glass negative. View full size.

Washington circa 1925. "H.A. Linger window." Here we have a display for a brand of mattress called Conscience. Conscience wears a blindfold and carries a torch. ("Go ahead. Even if he loved me more. Live it up! I'll never tell. But you'll always know what you did.") Yes, it's the mattress for people who are always being asked how do they sleep at night. National Photo Co. glass negative. View full size.

"Wilson Proctor Co. window." Continuing our survey of the spooky shop windows of Washington, we have this circa 1920 store display of Heywood-Wakefield baby carriages. National Photo Company Collection glass negative. View full size.

Halloween 1957, or "Tterrace and the Haunted Door Lock." Must be a dry run, since it's still daylight outside. My sister did the pumpkin decoration with an early felt-tip marker, and took this 2-1/4 square transparency. I'm 11. View full size.

"Jordan Piano Co., moonshine window." Circa 1920, another fall-themed window display at Jordan Piano in Washington, D.C. National Photo Co. View full size.

1927. "Dodge Motor Co. (Semmes Motor) Treasury cars." A trio of trucks belonging to the Treasury Department in Washington. National Photo Company Collection glass negative, Library of Congress. View full size.

Washington, D.C., circa 1921. "Jordan Piano Co. window, Halloween display." So you say you're having a Halloween party without a Victrola? Let us help before it's too late. National Photo Company Collection glass negative. View full size.

Washington, D.C., circa 1923. The Hub furniture store at Seventh and D Streets N.W. Free with any kitchen cabinet: One each of 74 "nationally known food products." National Photo Company Collection glass negative. View full size.