Torsion seismograph
- Title
- Torsion seismograph
- Collection
- Caltech Images Collection
- Series
- Scientific Instrument Photographs
- Identifier
- ST-GE-05
- Extents
- 1 photographs (negative)
- Abstract
- Mfg. Fred C. Henson Co., Pasadena. 14.5-inch tall. The full name of the instrument is the Wood-Anderson torsion seismograph. It was invented jointly by Harry O. Wood of the Seismo Lab and J.A. Anderson of the Mt. Wilson Observatory. Patent registered 9-1-25 in the name of the Carnegie Institution of Washington.