• Country
• United States of America (USA)

• Manufacturer / Brand
• Day-Fan Electric Co.; Dayton, Ohio (Fan and Motor Company)

• Year
• 1922

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 137726

• • alternative name: Dayton Fan and Motor Co.

• Main principle
• RF-Circuit or wave trap (separate, can also be an antenna with amp.)

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite case

• from Radiomuseum.org
• Model: Variometer - Day-Fan Electric Co.; Dayton,

• Notes
• "Variometer. Bank wound stator and rotor with consequent low distributed capacity.
  Minimum air gap.
  Wave length range of 140 to 2600 meters when used with variable condenser in the antenna circuit.
  Adjustable for wall, table or panel mounting.
  Mahogany bakelite with nickel trimmings. Small and compact. Highest grade finish and workmanship"

• Source of data
• -- Original prospect or advert

• Mentioned in
• Radio News Nov.1922, p.997

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

• Other Models

• Here you find 109 models, 38 with images and 44 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Day-Fan Electric Co.; Dayton, Ohio (Fan and Motor Company)