• Country
• United States of America (USA)

• Manufacturer / Brand
• Clapp-Eastham Co.; Cambridge, MA

• Year
• 1920

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 280767

• • Brand: Radak

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Variometer Type Z. R. V. - Clapp-Eastham Co.; Cambridge,

• Shape
• Miscellaneous shapes - described under notes.

• Dimensions (WHD)
• 3.75 x 4.5 x 6 inch / 95 x 114 x 152 mm

• Price in first year of sale
• 6.50 $

• Mentioned in
• circa 1920 Clapp-Eastham Co. Bulletin Z.R. page 6

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

• Other Models

• Here you find 130 models, 107 with images and 3 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Clapp-Eastham Co.; Cambridge, MA