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![Identified! [Man working with wires in the back of an early television screen]](http://farm66.static.flickr.com/65535/52053122402_7d6018f7e8_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Described! [Model for a statue with the 1849 territorial seal of Minnesota on the pedestal. The man could be Henry Mower Rice for whom a statue with a different pose and clothing was added to the United States Capitol Statuary Hall in 1917] (LOC)](http://farm66.static.flickr.com/65535/49354204892_8163ed1c26_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! [9-lens aerial mapping camera made by the Fairchild Aerial Camera Corp. for the U.S. Coast & Geodetic Survey. It was built under the direction of Capt. O.S. Reading in 1935] (LOC)](http://farm1.static.flickr.com/607/21899752971_6dd974a7b0_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Walter S. Lemmon (left), developer of the radio typewriter with a radio engineer testing the device at the Bureau of Air Commerce of the Department of Commerce]](http://farm66.static.flickr.com/65535/52053125107_99ec9fed04_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)
![Identified! [Sarah Keefe, teletype operator demonstrating sending Weather Bureau, Bureau of Standards weather maps using a teletype device in the offices of the American Telephone and Telegraph Co., Washington, D.C.]](http://farm66.static.flickr.com/65535/52054407294_f446933cca_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Charles Greeley Abbot, astrophysicist and Secretary of the Smithsonian, with his device: a silver-disc pyrheliometer which measures direct beam solar irradiance] (LOC)](http://farm1.static.flickr.com/765/21899747561_754c9fc5f9_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Man with a US Navy Department photoradiogram (or photo-radiogram), probably related to the first message sent between the Navy Department and the flagship of the president]](http://farm66.static.flickr.com/65535/52054656575_2095a16507_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Man holding a Weston Electrical Instrument Model 322 microammeter at a window]](http://farm66.static.flickr.com/65535/52054654545_d1737c1355_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)

by The Library of Congress
No known copyright restrictions(著作権制限なし)
![Identified! [Underwater breathing devices: "Dräger Gegenlunge" (left), "Momseng Lung" (center), and "Davis Submerged Escape Apparatus" (right)] (LOC)](http://farm6.static.flickr.com/5635/21701991690_1bebc0c71e_m.jpg)
by The Library of Congress
No known copyright restrictions(著作権制限なし)
No known copyright restrictions(著作権制限なし)