Electromagnetic
loudspeaker, made by Alfred Graham & Company in London,
for Cosmos, the trade mark
of Metropolitan-Vickers (Metro-Vick).
Petal-shaped flare made of ten
metal-framed segments of steam bended oak wood, black
cast metal neck,
nickel-plated base and 2,000 ohm drive unit.
By turning the knurled screw, the distance between the magnet
and the diaphragm can be changed.
The
original price was £ 5.5.0.
Data
Serial
number: B90099
DC resistance: 2000 Ohms
Diameter: 38 cm
Made in 1923
Purchased in 2005
Sold in 2023
What
was broadcast in 1923?
Listen to
"Dumbell (intro Jennie)" by Bert Ambrose and his
Orchestra,
recorded April 6, 1923
The driver
unit
Advertisement in Experimental Wireless, October 1924
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