• Country
• United States of America (USA)

• Manufacturer / Brand
• Colby's Telegraph School; Auburn, New York

• Year
• 1917

• Category
• Radio part (not a module) 

• Radiomuseum.org ID
• 258641

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

• Wave bands
• Long Wave and/or Very Low Frequency (VLF).

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case

• from Radiomuseum.org
• Model: 15,000 Meter Loading Inductance - Colby's Telegraph School;

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes

• 15,000 Meter Loading Inductance in quartered oak case with 9 taps. 

• Price in first year of sale
• 8.00 $

• Literature/Schematics (2)
• May 1917, The Electrical Experimenter magazine page 59

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

• Other Models

• Here you find 12 models, 12 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Colby's Telegraph School; Auburn, New York