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Description
Rare early 20th century (circa 1910s) Ayrton Universal Shunt - Model 2164 - Leeds and Northrup Company - Philadelphia - 201845 - Made in the USA. Wood case, brass terminals, Bakelite knobs.
"Western Electric - 1916 Electrical Supply Year Book: 'Model 2164 - Ayrton Universal Shunt of about 100,000 Ohms, for galvanometers of 3,000 to 10,000 Ohms.” (Source: Radio Museum)
"The Ayrton shunt or universal shunt is a high-resistance shunt used in galvanometers to increase their range without changing the damping. The circuit is named after its inventor, William E. Ayrton. Multirange ammeters that use this technique are more accurate than those using a make-before-break switch.[4] Also, it will eliminate the possibility of having a meter without a shunt, which is a serious concern in make-before-break switches. The selector switch changes the amount of resistance in parallel with Rm (meter resistance). The voltage drop across parallel branches is always equal. When all resistances are placed in parallel with Rm, the maximum sensitivity of the ammeter is reached." (Source: Wikipedia)
Condition
Good Overall - Gentle wear
Dimensions
6" x 6" x 5.75" (Width x Depth x Height)