Period

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The use of speaking tubes on the bridge of a naval vessel for communicating with other decks
ARP23A15_236

The use of speaking tubes on the bridge of a naval...

Aerial Telegraph
ARP15A00_403

Aerial Telegraph

Aerial Telegraph
ARP15A00_402

Aerial Telegraph

Propaganda illustration by Carlos Saenz De Tejada
ARP17A21_289

Propaganda illustration by Carlos Saenz De Tejada

Heroic wireless operators, 1912
ARP07108_0460000718

Heroic wireless operators, 1912

Louis Botha
ARP07102_390006084

Louis Botha

World War l: United States Army Signal Corps in France
ARP07094_390000679

World War l: United States Army Signal Corps in Fr...