Ballistic galvanometer : this galvanometer has been designed for very low current measurement. Leveling screws for balancing the coil. Coil with mirror suspended between the long suspension at the upper end and a spring at the lower end. Suspension and spring are made of special alloy to provide high degree of sensitivity to the movement. Movement housed in a bakelite case. Resistance : 100 or 500 ohms. Time period : 10 to 15 sec.
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Saha, Ambala, Haryana