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• Thermo_galvanometer abstract "The thermo-galvanometer is an instrument for measuring small electric currents. It was invented by William Duddell about 1900. The following is a description of the instrument taken from a trade catalog of Cambridge Scientific Instrument Company dated 1905: For a long time the need of an instrument capable of accurately measuring small alternating currents has been keenly felt. The high resistance and self-induction of the coils of instruments of the electro-magnetic type frequently prevent their use. Electro-static instruments as at present constructed are not altogether suitable for measuring very small currents, unless a sufficient potential difference is available.The thermo-galvanometer designed by Mr W. Duddell can be used for the measurement of extremely small currents to a high degree of accuracy. It has practically no self-induction or capacity and can therefore be used on a circuit of any frequency (even up to 120,000~ per sec.) and currents as small as twenty micro-amperes can be readily measured by it . It is equally correct on continuous and alternating currents. It can therefore be accurately standardized by continuous current and used without error on circuits of any frequency or wave-form.The principle of the thermo-galvanometer is simple. The instrument consists of a resistance which is heated by the current to be measured, the heat from the resistance falling on the thermo-junction of a Boys radio-micrometer. The rise in temperature of the lower junction of the thermo-couple produces a current in the loop which is deflected by the magnetic field against the torsion of the quartz fibre.<blockquote/>".
• Thermo_galvanometer thumbnail Cambridge_Thermo_Galvanometer_1905.jpg?width=300.
• Thermo_galvanometer wikiPageID "30121570".
• Thermo_galvanometer wikiPageRevisionID "533372773".
• Thermo_galvanometer hasPhotoCollection Thermo_galvanometer.
• Thermo_galvanometer subject Category:Galvanometers.
• Thermo_galvanometer subject Category:Historical_scientific_instruments.
• Thermo_galvanometer type Artifact100021939.
• Thermo_galvanometer type Device103183080.
• Thermo_galvanometer type HistoricalScientificInstruments.
• Thermo_galvanometer type Instrument103574816.
• Thermo_galvanometer type Instrumentality103575240.
• Thermo_galvanometer type Object100002684.
• Thermo_galvanometer type PhysicalEntity100001930.
• Thermo_galvanometer type ScientificInstrument104147495.
• Thermo_galvanometer type Whole100003553.
• Thermo_galvanometer comment "The thermo-galvanometer is an instrument for measuring small electric currents. It was invented by William Duddell about 1900. The following is a description of the instrument taken from a trade catalog of Cambridge Scientific Instrument Company dated 1905: For a long time the need of an instrument capable of accurately measuring small alternating currents has been keenly felt.".
• Thermo_galvanometer label "Thermo galvanometer".
• Thermo_galvanometer sameAs m.0g57d0m.
• Thermo_galvanometer sameAs Q7783111.
• Thermo_galvanometer sameAs Q7783111.
• Thermo_galvanometer sameAs Thermo_galvanometer.
• Thermo_galvanometer wasDerivedFrom Thermo_galvanometer?oldid=533372773.
• Thermo_galvanometer depiction Cambridge_Thermo_Galvanometer_1905.jpg.
• Thermo_galvanometer isPrimaryTopicOf Thermo_galvanometer.