Barometer is used for measuring atmospheric pressure.
Binocular is an optical instrument designed for magnified view of distant objects by both eyes simultaneously.
Calorimeter is an instrument for measuring quantities of heat.
Chronometer is a clock to determine longitude of a vessel at sea.
Clinical Thermometer is a thermometer for measuring the temperature of human body.
Colorimeter is an instrument for comparing intensities of colour.
Commutator is an instrument to change or reverse the direction of an electric current. In dynamo, it is used to convert the alternating current into direct current.
Computer is a technical device designed to find instantaneous solutions of huge and complex calculations based on the information already fed.
Crescograph is an instrument for measuring the growth of plants. This was invented by an Indian, Mr. J.C. Bose, a renowned botanist.
Cyclotron is an apparatus for electromagnetic acceleration of charged atoms. It has made possible to make ordinary elements radioactive, leading to production of radioactive isotopes.
Dictaphone is a machine which first records what is spoken into it and then reproduces it in type.
