• Country
• United States of America (USA)

• Manufacturer / Brand
• Chelsea Radio Corp. (National); Chelsea, Boston (MA)

• Year
• 1923

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 220174

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Vernier Variometer - Chelsea Radio Corp. National;

• Notes
• Vernier Variometer. Panel or table mounting.

• Price in first year of sale
• 8.00 $

• Mentioned in
• Radio Broadcast, Oct. 1923, p. 524

• Author
• Model page created by Hans-Joachim Korn † 16.11.15. See "Data change" for further contributors.

• Other Models

• Here you find 29 models, 25 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Chelsea Radio Corp. (National); Chelsea, Boston (MA)