William du Bois Duddell, English electrical engineer, early 20th century.
4 0 c m
 
32cm
actual image size: 24cm x 32cm

William du Bois Duddell, English electrical engineer, early 20th century.

© Science Museum / Science & Society Picture Library

Description

Photograph of William du Bois Duddell (1872-1917), the inventor of the electromagnetic oscillograph. This allowed the photographic recording and observation of oscillating audio frequency waveforms.
 

Image Ref.

10401770
 

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