• Country
• United States of America (USA)

• Manufacturer / Brand
• Doubleday-Hill Electric Co. (DHE); Pittsburgh, PA

• Year
• 1917

• Category
• Amateur Equipment (Other, but not Key)

• Radiomuseum.org ID
• 195174

• Wave bands
• - without

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Rotary Spark Gap - Doubleday-Hill Electric Co.

• Shape
• Tablemodel, with any shape - general.

• Notes
• Doubleday-Hill Electric Co. advertised this "Two Gaps in One" rotary spark gap in the April 1917 QST magazine.

• Price in first year of sale
• 21.00 $

• Literature/Schematics (1)
• April 1917 QST Doubleday-Hill advertisement page 86

• Author
• Model page created by Alan Larsen. See "Data change" for further contributors.

• Other Models

• Here you find 3 models, 3 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Doubleday-Hill Electric Co. (DHE); Pittsburgh, PA