Vivian Leroy Crisler (1885-1953), an acoustics researcher at the National Bureau of Standards, Washington, D.C., looking over a loud speaker horn used in sound penetration tests

A new use for discarded automobile horns has been discovered by Dr. Wm. C. Fowler, health officer of Wash., D.C. Dr. Fowler has adapted an old rams-horn type auto horn, a relic of the days when they blew them with bulbs, and fitted it to his radio to serve as a loud speaker. This gives as good a ton

R. Davis of Bu. of Standards with camera for testing photographic materials, 6/16/25

Government expert listens to broadcasts of automobile. The Automotive Section of the Bureau of Standards is studying the anti-knock proportion of fuel used in automobile and aircraft engines and the scientist in this photograph is "listening in" to the signals of an engine instead of listening

K.P. Royce of Graybear Elec. Co. making survey of noises, 2/18/26

K.P. Royce of Graybear Electric Co. making survey of noises, 2/18/26

Testing airplanes lenses used in map making. Washington, D.C., May 6. Dr. F.E. Washer of the U.S. Bureau of Standards testing the lens for the airplane cameras that are used by the Army and Navy. There are lights in the rear of the columnmeters and exposures are made on the photographic plate in fro

The first radio beacon is inaugerated. An executive photograph showing Dr. George K. Burgess, Director fo the United States Bureau of Standards, and the aircraft radio beacon at College Park, Maryland, designed for guiding airplanes by radio. This is the first radio beacon for use of civil aviation

Air engine tester. Dr. K.C. Dickinson, Chief of the Heat and Power Division of the Bureau of Standards, and the control room of the new aircraft engine testing laboratory at Arlington, VA. Here all engines for use on licensed airplanes are to be tested and to protect the observer, the control room a