Periscope: It is usually used by the crew of a submarine to survey the ships etc, on the surface of the sea while the submarine is under water. It also enables the sailors to observe objects on the other side of an obstacle without exposing themselves.
Phonograph: is an instrument used for reproducing sound.
Photometer: is an apparatus used to compare the illuminating power of two sources of light.
Pipette: It is a glass tube with the aid of which a definite volume of liquid may be transferred.
Potentiometer: is used for comparing the e.m.f.s, of cells, measurements of the thermal e.m.f.s, large potential differences and currents. It is also used for measuring low resistances.
Psychrometer: is an instrument for measurement of the humidity of the atmosphere.
Pyrometer: is an instrument for recording high temperatures from a great distance (i.e., for recording temperature of the sun etc.) by making use of the laws of radiation.
Radar: Radio, Angle, Detection And Range is used to detect the direction and range of an approaching aeroplane by means of radio microwaves.
Rain Gauge: is an apparatus for recording of rainfall at a particular place.
Radiometer: is an instrument for measuring the emission of radiant energy.
Refractometer: is an instrument to measure refractive indices.
Saccharimeter: is an instrument for determining the amount of sugar in a solution. It is used in breweries.
Seismometer or Seismograph: is an instrument used for recording earthquake shocks.
Sextant: is an instrument invented by John Hadley used for measuring the altitude of the sun and of other inaccessible heavenly bodies.
Spectrometer: (1) It is a type of spectroscope suitable for the precise measurements of refractive indices. (2) An instrument for measuring the energy distribution of a particular type of radiation.
Speedometer: is an instrument which indicates speed at which a vehicle is moving.
Spherometer: is an instrument for measuring curvature of surfaces.
Sphygmomanometer: an instrument used for measuring arterial blood-pressure.
Sphygmophone: an instrument, with the help of which a pulse beat makes a sound.
Sphygmoscope: an instrument, by virtue of which, arterial pulsations become visible.
Stereoscope: It is a special type of binocular, through which a double photograph snapped from two different angles by a two-lensed camera is viewed in solid relief.
Stethoscope: is an instrument to hear and analyse movements of heart and lungs.
Stop watch: for recording small intervals of time in the laboratory, in races and other events.
Stroboscope: is an instrument for viewing objects moving rapidly with a periodic motion and to see them as if they were at rest.
Tachometer: is an instrument for determining speeds of aeroplanes and motor boats.
Telephone: a device by virtue of which two persons at two different places can communicate. It consists of two main parts (i) a microphone and (ii) a receiver.
Teleprinter: an instrument which prints automatically messages sent from one place to another, on telegraph lines.
Telescope: is an apparatus used for observing distant objects.
Theodolite: is an instrument for measuring horizontal and vertical angles.
Thermocouple: an instrument based on thermo-electricity used for measuring temperatures.
Thermometer: is an apparatus used for measuring temperature.
Thermostat: It is an instrument used to regulate the temperature to a particular degree.
Viscometer: is an instrument to measure viscosity.
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23/11/2015
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