Battery Eliminator

National Company Incorporated, Manufacturer

Circa 1920
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Maker and Role
National Company Incorporated, Manufacturer
Production Date
Circa 1920
A National battery eliminator, type B7180. Black metal, rectangular in shape with angled surfaces below top surface for control panel. Control panel contains 5 dials and 4 semi-circular switches. Ventilation holes in each side. Power cord extends from centre-back of eliminator.
Components of eliminator include: transformer sealed in compound to make it silent, a type 80 rectifier valve, smoothing condensers sealed in compound, voltage divider with a resistance of 11,000 ohms and adjustable tappings for 22 ~ 45, 67 + or -, 90 + or -, and 180 or less volts. These are adjusted on the front control panel.
Processed Material/Metal
Signature/Marks and Type
National / Type B 7180 / 230 Volts 50-60 Cycles / Manufactured by / National Co. Inc., Malden, Mass, U.S.A. / The National B is licensed / Under R.C.A. patents Maker's Plate
Accession No
Credit Line
National Company Incorporated. Circa 1920. Battery Eliminator, 1978.338. The Museum of Transport and Technology (MOTAT).

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