Audiophone It is used for improving imperfect sense of hearing. Audiometer It measures intensity of sound. Anemometer It measures force and velocity of wind. Ammeter It measures strength of electric current (in amperes) Altimeter It measures altitudes and is used in aircrafts Balometer It measures heat radiation. Binocular It is used to view distant Objects Barometer It measures atmospheric pressure. Barograph It is used for continuous recording of atmospheric pressure. Chronometer It determines longitude of a place kept onboard ship. Cardiogram It traces movements of the heart, recorded on a cardiograph. Carburetor It is used in an internal combustion engine for charging air with petrol vapour. Calorimeter It measures quantity of heat. Cinematography It is an instrument used in cinema making to throw on screen and enlarged image of photograph. Crescograph It measures the growth in plants. Cyclotron A charged particles accelerator which can accelerate charged particles into high energies. Dynamo It converts mechanical energy into electrical energy. Dynamometer It measures electric power.