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How to keep on your own wave length. Dr. J.H. Dellinger, Chief of the radio laboratory of the bureau of standards, is seen examining a frequency indicator, which is a device that enables radio broadcasting stations to keep on their respective wave lengths when broadcasting. This radio laboratory has
Public domain

How to keep on your own wave length. Dr. J.H. Dellinger, Chief of the radio laboratory of the bureau of standards, is seen examining a frequency indicator, which is a device that enables radio broadcasting stations to keep on their respective wave lengths when broadcasting. This radio laboratory has

Harris & Ewing · 1923 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

Subjects
glass negativesunited states
Credit lineHow to keep on your own wave length. Dr. J.H. Dellinger, Chief of the radio laboratory of the bureau of standards, is seen examining a frequency indicator, which is a device that enables radio broadca. 1923. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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