• Year
  • 1899 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 234260
    • alternative name: Jewell

 Technical Specifications

  • Wave bands
  • - without
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: AC-Ammeter 155 - Weston Electrical Instrument
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 180 x 170 x 82 mm / 7.1 x 6.7 x 3.2 inch
  • Notes
  • Portable AC Ammeter Single Range 5 A.

    Instruments such as this were used by trained technical/scientific staff for precision laboratory measurements of electrical current, and as secondary standards for calibrating other meters. The mirrored scale makes it easier to read the instrument to a given accuracy by enabling the user to eliminate parallax errors. This particular instrument was specified to be accurate to ± 0.5%.

    These ammeters are arranged to be connected directly in the circuit in which the current is to be measured. Other range available are: 1, 2, 3, 5, 10, 15, 25, 50, 75, 100 and Double Range: 1/5, 2/1, 5/2.5, 10/5.

     

  • Net weight (2.2 lb = 1 kg)
  • 1.8 kg / 3 lb 15.4 oz (3.965 lb)
  • Price in first year of sale
  • 31.25 USD
  • Mentioned in
  • -- Original-techn. papers.
  • Author
  • Model page created by Renato Capasso. See "Data change" for further contributors.

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