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Gold Grain Detector

Gold Grain Detector ; National Airphone (ID = 456277) mod-past25 Gold Grain Detector ; National Airphone (ID = 456280) mod-past25
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Gold Grain Detector ; National Airphone (ID = 456277) mod-past25
National Airphone: Gold Grain Detector [mod-past25] ID = 456277 587x385
Select picture or schematic to display from thumbnails on the right and click for download.
For model Gold Grain Detector, National Airphone Corp.; New York (NY):
By courtesy of K. Birkner
 
Country:  United States of America (USA)
Manufacturer / Brand:  National Airphone Corp.; New York (NY)
Year: 1922/1923 Category: Radio module post 1925 (not a part, not a key)
Main principle Crystal or Solid State Detector
Wave bands - without
Details
Power type and voltage No Power needed
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Gold Grain Detector - National Airphone Corp.; New
Material Various materials
Dimensions (WHD) 2.4 x 1.2 x 1.5 inch / 61 x 30 x 38 mm
Notes Sealed detector element on a little board with 2 binding posts. Contact with the crystal by hundreds of loose grains of pure gold. Price in 1922 $2.50, in 1923 $1.50. Also available without stand for panel mounting, price $1.00.
Price in first year of sale 2.00 $
Source of data Crystal Clear (Volume 1)
Mentioned in Crystal Clear Volume 2 (Radio News 11/1922)
Literature/Schematics (4) October 1923 The Radio News magazine advertisement page 369

Model page created by Otto Frosinn. See "Data change" for further contributors.



All listed radios etc. from National Airphone Corp.; New York (NY)
Here you find 15 models, 13 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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