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Encyclopedia > Measuring instrument
Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea
A Love Meter at a Framingham, Massachusetts Rest Stop.

In the physical sciences and engineering, measurement is the activity of obtaining and comparing physical quantities of real-world objects and events. Established standard objects and events are used as units, and the measurement results in a given number for the relationship between the item under study and the referenced unit of measurement. Measuring instruments and formal test methods are the means by which this translation is made. All measuring instruments are subject to varying degrees of instrument error and measurement uncertainty. Download high resolution version (517x721, 153 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (517x721, 153 KB) Wikipedia does not have an article with this exact name. ... Captain Nemo is a fictional character featured in Jules Vernes novels Twenty Thousand Leagues Under the Sea (1870) and The Mysterious Island (1874). ... Twenty Thousand Leagues Under the Sea (French: ) is a classic science fiction novel by French writer Jules Verne, published in 1870. ... == Headline text ==cant there be some kind of picture somewhere so i can see by picture???? Physical science is a encompassing term for the branches of natural science, and science, that study non-living systems, in contrast to the biological sciences. ... Engineering is the discipline and profession of applying scientific knowledge and utilizing natural laws and physical resources in order to design and implement materials, structures, machines, devices, systems, and processes that realize a desired objective and meet specified criteria. ... Measurement is the estimation of the magnitude of some attribute of an object, such as its length or weight, relative to a unit of measurement. ... A physical quantity is either a quantity within physics that can be measured (e. ... In philosophy, an object is a thing, an entity, or a being. ... For other uses, see Phenomena (disambiguation). ... The former Weights and Measures office in Middlesex, England. ... A test method is a definitive procedure that produces a test result. ... Instrument error refers to the combined accuracy and precision of a measuring instrument, or the difference between the actual value and the value indicated by the instrument (error). ... The measurement uncertainty quantifies the distance between the actually measured value of a physical quantity and the true value of the same physical quantity. ...

Physicists use a vast range of instruments to perform their measurements. These range from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. Virtual instrumentation is widely used in the development of modern measuring instruments. Not to be confused with physician, a person who practices medicine. ... A stopwatch is a timepiece designed to measure the amount of time elapsed from a particular time when activated to when the piece is deactivated. ... An electron microscope is a type of microscope that uses electrons as a way to illuminate and create an image of a specimen. ... Atom Smasher redirects here. ... Virtual Instrumentation is the use of customizable software and modular measurement hardware to create user-defined measurement systems, called virtual instruments. ...

### Time

Timeline of time measurement technology

This article is about the concept of time. ... For other uses, see Calendar (disambiguation) A page from the Hindu calendar 1871â€“1872. ... A chronometer is a timekeeper precise enough to be used as a portable time standard, usually in order to determine longitude by means of celestial navigation. ... For other uses, see Clock (disambiguation). ... â€œNuclear Clockâ€ redirects here. ... Radiometric dating (often called radioactive dating) is a technique used to date materials, based on a comparison between the observed abundance of particular naturally occurring radioactive isotopes and their known decay rates. ... Timeline of time measurement technology 270 BC - Ctesibius builds a popular water clock 46 BC - Julius Caesar and Sosigenes develop a solar calendar with leap years 1000s - Sets of hourglasses were maintained by ships pages to mark the progress of a ship during its voyage 1000s - Large town clocks...

### Length (i.e., distance)

For other uses of this word, see Length (disambiguation). ... Diagram showing the face of a three-pointer sensitive aircraft altimeter displaying altitude in feet. ... An architects scale is a specialized ruler. ... For the brake caliper, see disc brake. ... An engineers scale is a ruler, a tool for measuring distances. ... Gauge blocks, (also known as gage blocks, Johansson gauges, or slip gauges) are precision ground and lapped measuring standards. ... GPS redirects here. ... Interferometry is the applied science of combining two or more input points of a particular data type, such as optical measurements, to form a greater picture based on the combination of the two sources. ... Soon after the invention of the laser in 1960, it was described as a solution in search of a problem. However, since that time, the laser has found a place as a useful tool in many scientific, military, medical and industrial applications. ... Outside, inside, and depth micrometers A micrometer, also known as a micrometer screw gauge, is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. ... A modern non-digital odometer A Smiths speedometer from the 1920s showing odometer and trip meter An odometer is a device used for indicating distance traveled by an automobile or other vehicle. ... An opisometer or map measurer is an instrument for measuring the lengths of arbitrary curved lines. ... A variety of rulers A 2 metre carpenters rule Retractable flexible rule A ruler or rule is an instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines. ... A tachymeter (also tachymetre or tacheometer) is a kind of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target, and is highly automated in its operations. ... Self-retracting pocket tape measure plastic tape measure A tape measure or measuring tape is a ribbon of cloth, plastic, or metal with linear-measure markings, often in both imperial and metric units. ... A taximeter is a mechanical or electronic device installed in taxicabs, similar to an odometer, which calculates passenger fares based on a combination of distance travelled and waiting time. ...

### Area

This article is about the physical quantity. ... A planimeter is a measuring instrument used to measure the surface area of an arbitrary two-dimensional shape. ...

### Level

Look up level in Wiktionary, the free dictionary. ... A spirit level A spirit level or bubble level is an instrument designed to indicate whether a surface is level or plumb. ... Typical consumer laser line level using spirit levels for three planes and including a digital stud sensor display. ... Dumpy level in use on a construction site Leveler for use by hand A dumpy level, builders auto level, leveling instrument or automatic level is an optical instrument used in surveying and building to transfer, measure, or set horizontal levels. ... A tiltmeter is an instrument designed to measure very small changes from the horizontal level, either on the ground or in structures. ...

### Volume

(if the mass density of a solid is known, weighing allows to calculate the volume) For other uses, see Volume (disambiguation). ... right|thumb|100px|Graduated cylinder. ... This article is about the laboratory instrument. ... Flow measurement is the quantification of bulk fluid or gas movement. ...

### Speed

This article does not cite any references or sources. ... Speedometer gauge on a car, showing the speed of the vehicle in miles and kilometres per hour on the outâ€“ and inside respectively. ... Tachometer showing engine RPM (revolutions per minute), and a redline from 6000 and 7000 RPM. A tachometer is an instrument that measures the speed of rotation of a shaft or disk, as in a motor or other machine. ... A tachymeter (also tachymetre or tacheometer) is a kind of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target, and is highly automated in its operations. ... Airspeed Indicator in a light aircraft The airspeed indicator or airspeed gauge is an instrument used in an aircraft to display the crafts airspeed, typically in knots, to the pilot. ...

### Angle

This article is about angles in geometry. ... A Jacobs staff, from John Sellers Practical Navigation (1672) In surveying, the Jacobs staff or cross-staff is a single straight rod or staff, pointed and iron-shod at the bottom, for penetrating the ground. ... A quadrant is an instrument that is used to measure angles up to 90Â°. // There are several types of quadrants: Mural quadrants used for measuring the altitudes of astronomical objects. ... Octant Octant is a measuring instrument similar to a sextant. ... A sextant is a measuring instrument generally used to measure the angle of elevation of a celestial object above the horizon. ... The term protractor is used both in technics and surgery. ... An optical theodolite, manufactured in the Soviet Union in 1958 and used for topographic surveying. ... Drawing of a circumferentor from the Cyclopaedia A circumferentor, or surveyors compass, is an instrument used in surveying to measure horizontal angles, now superseded by the theodolite. ...

### angular velocity or rotations per time unit

Angular velocity describes the speed of rotation and the orientation of the instantaneous axis about which the rotation occurs. ... A stroboscope , also known as a strobe, is an instrument used to make a cyclically moving object appear to be slow-moving or stationary. ... Tachometer showing engine RPM (revolutions per minute), and a redline from 6000 and 7000 RPM. A tachometer is an instrument that measures the speed of rotation of a shaft or disk, as in a motor or other machine. ...

### Mass

For other uses, see Mass (disambiguation). ... Digital kitchen scales. ... Digital kitchen scales. ... Mass spectrometry is a technique for separating ions by their mass-to-charge (m/z) ratios. ... A katharometer is an instrument for determining the composition of a gas mixture. ...

### Linear momentum

In physics, momentum is a physical quantity related to the velocity and mass of an object. ... A torsion spring is a ribbon, bar, or coil that reacts against twisting motion. ...

### Pressure

Timeline of temperature and pressure measurement technology

This article is about pressure in the physical sciences. ... A barometer is an instrument used to measure atmospheric pressure. ... A manometer is a pressure measuring instrument, often also called pressure gauge. ... A Pitot tube is a measuring instrument used to measure fluid flow. ... This article does not cite any references or sources. ... A hemispherical cup anemometer of the type invented in 2000 by John Thomas Romney Robinson An anemometer is a device for measuring the velocity or the pressure of the wind, and is one instrument used in a weather station. ... This article does not cite any references or sources. ... A tire pressure gauge is used to measure the pressure of tires on a vehicle. ... BP 126/70 mmHg as result on electronic sphygmomanometer A sphygmomanometer (often condensed to sphygmometer[1]) or blood pressure meter is a device used to measure blood pressure, comprising an inflatable cuff to restrict blood flow, and a mercury or mechanical manometer to measure the pressure. ... A sphygmomanometer, a device used for measuring arterial pressure. ... Timeline of temperature and pressure measurement technology 1592 - Galileo Galilei builds a crude thermometer using the contraction of air to draw water up a tube 1612 - Santorre Santorio puts thermometer to medical use 1643 - Evangelista Torricelli invents the mercury barometer 1714 - Daniel Gabriel Fahrenheit invents the mercury in glass thermometer...

### Flow measurement

Flow measurement is the quantification of bulk fluid or gas movement. ... A typical residential water meter A water meter is a device used to measure water usage. ... A residential gas meter of the usual diaphragm style A gas meter is used to measure the flow of fuel gases such as natural gas and propane. ... A Metering pump is a pump used to pump liquids at adjustable flow rates which are precise when averaged over time. ... A mass flow meter, also known as inertial flow meter and coriolis flow meter, is a device that measures how much liquid is flowing through a tube. ...

### Angular momentum

This gyroscope remains upright while spinning due to its angular momentum. ...

### Torque

For other senses of this word, see torque (disambiguation). ... The Prony Brake is a simple device invented by Gaspard de Prony to measure the torque produced by an engine. ...

### Heat

For other uses, see Heat (disambiguation) In physics, heat, symbolized by Q, is energy transferred from one body or system to another due to a difference in temperature. ... A calorimeter is a device used for calorimetry, the science of measuring the heat of chemical reactions or physical changes as well as heat capacity. ... Actinometers are instruments used to measure the heating power of radiation. ...

### Substance content in mixtures

Look up substance in Wiktionary, the free dictionary. ... Overview Mixtures are multi-rank organ stops most commonly of principal, or diapason, tone quality. ... // An oxygen sensor is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed. ... A CO2 sensor is an instrument for the measurement of carbon dioxide gas. ... Mass spectrometry (previously called mass spectroscopy (deprecated) or informally, mass-spec and MS) is an analytical technique that measures the mass-to-charge ratio of ions. ... For the Second Person album, see Chromatography (album). ...

#### pH: Concentration of Protons in a Solution

For other uses, see PH (disambiguation). ... For other uses, see Concentration (disambiguation). ... The Saturated calomel electrode (SCE) is a reference electrode which uses the reaction between mercury metal and mercury(I) chloride, to fix its potential. ... A pH meter is an electronic instrument used to measure the pH (acidity or basicity) of a liquid (though special probes are sometimes used to measure the pH of semi-solid substances, such as cheese). ...

#### Humidity: Density of Water in Air

The term humidity is usually taken in daily language to refer to relative humidity. ... For other uses, see Density (disambiguation). ... The interior of a Stevenson screen showing a motorized psychrometer Hygrometers are instruments used for measuring humidity. ...

### Density

For other uses, see Density (disambiguation). ... An aerometer is a scientific instrument used to measure the weight and density of a gas or liquid. ... The pycnometer or pyknometer is a device used for measuring fluid density, also known as a specific gravity bottle. ...

### Hardness

A durometer is a tool used to measure hardness. ...

For other uses, see Radiation (disambiguation). ... This article or section does not cite any references or sources. ... A Nichols radiometer is the apparatus used by Nichols and Hull in 1901 for the measurement of radiation pressure. ...

### Light

For other uses, see Light (disambiguation). ... In the broadest sense, a photometer is any instrument used to measure illuminance or irradiance. ... Spectrometer A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. ...

### Sound

This article is about audible acoustic waves. ... Sound level meters measure sound pressure level and are commonly used in noise pollution studies for the quantification of almost any noise, but especially for industrial, environmental and aircraft noise. ...

### Electronic test equipment

These are instruments used for measuring electrical properties. Also see meter (electronics). Back to Electronics A Tektronix model 475A portable analogue oscilloscope Electronic test equipment (sometimes called testgear) is used to create stimulus signals and capture responses from electronic Devices Under Test (DUTs). ... In electronics, there are many types of meters used for different functions. ...

An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. ... Wire carrying current to be measured Spring providing restoring force An ammeter is a measuring instrument used to measure the flow of electric current in a circuit. ... Wire carrying current to be measured Restoring spring N and S are poles of magnet A galvanometer is a type of ammeter â€” an instrument for detecting and measuring electric current. ... An Ohmmeter is an electrical measuring instrument that measures electrical resistance, the opposition to the flow of an electric current. ... Two digital voltmeters. ... A Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. ... A digital multimeter A low cost digital multimeter An analog benchtop multimeter A multimeter or a multitester is an electronic measuring instrument that combines several functions in one unit. ... Illustration showing the interior of a cathode-ray tube for use in an oscilloscope. ... The wattmeter is an electrodynamic instrument for measuring the electric power or the supply rate of electrical energy of any given circuit. ... Typical US domestic electricity meter An electricity meter is generally taken to be a device which measures the amount of electrical energy supplied to a customer of an electricity company. ... Power meter redirects here. ...

### Uncategorized

Note that the alternate spelling "-metre" is never used when referring to a measuring device. This article is about the unit of length. ...

Wikimedia Commons has media related to:
Measuring instruments
In telecommunication, the term detector has the following meanings: A device that is responsive to the presence or absence of a stimulus. ... The definition, agreement and practical use of units of weights and measures have played a crucial role in human endeavor from early ages up to this day. ... Timeline of temperature and pressure measurement technology 1592 - Galileo Galilei builds a crude thermometer using the contraction of air to draw water up a tube 1612 - Santorre Santorio puts thermometer to medical use 1643 - Evangelista Torricelli invents the mercury barometer 1714 - Daniel Gabriel Fahrenheit invents the mercury in glass thermometer...

Results from FactBites:

 Instrument for measuring breast shape - Patent 5485855 (8744 words) In the instrument for measuring breast shape configured above, it is preferable that a slit, to which the other free end of the horizontal tape measure is to be put, is provided on the base member at a position in the vicinity of the other highest position of the substantially half-circular edge part. In the instrument for measuring breast shape described above, it is preferable that a slit, to which the other free end of the horizontal tape measure is to be put, is provided on the base member at a position in the vicinity of the other highest position of the substantially half-circular edge part. The vertical tape measure 54 is to be used for measuring the vertical length of the breast between the nipple and the lowest position of the verg's line of the breast (hereinafter abbreviated as "vertical length of the breast").
 Measuring Instrument (352 words) Measuring instrument is an instrument that measures and shows the limit, or extent, or amount, or quantity, or degree of something. There are various types of instruments used for measurement, ranging from simple objects such as rulers and stopwatches to electron microscopes and particle accelerators. For measuring temperature various instruments used are thermometer, thermocouple, thermistor and pyrometer, etc while hygrometer is used for measuring humidity.
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