By combining the dry bulb and wet bulb temperature in a psychrometric chart the state of the humid air can be determined. These units may or may not be the SI unit but rather the units relevant to the measurement. Therefore, to measure the strain, you have to accurately measure very small changes in resistance. Ball Gauges. Takes longer time too to measure with telescoping gauges. Nowadays, American wire gauges are also used to measure non-metallic wires to specify body piercing jewellery sizes. Maximum temperature has historically been measured with a mercury-in-glass thermometer which has a constriction in the neck of the thermometer tube. Linear Measuring Instruments. A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or a cloud base from the ground. It’s this shape that’s responsible for the telescopic gauge’s accuracy. The result generated by "measuring" is the actual dimension of the workpiece feature. The bulb of one thermometer is kept wet (by means of a thin, wet cloth wick) so that the cooling that results from evaporation makes it register a lower temperature than the dry-bulb thermometer. A light, flexible cylinder or cone mounted on a mast to show the direction and strength of the wind. Add or subtract the recorded value from the target number the indicator was calibrated to. When the temperature falls, the liquid and index move down the column, but when the temperature rises the index remains in the lowest position while the liquid expands up the tube. It is generally used for internal combustion engines or even a compressor. It is used to measure cross section of an electric cable or wire. An American wire gauge or an AWG is a standardised wire gauge system. As the name suggests, a flat plate is an instrument which is used to measure the flatness of an object or a surface. It is used to measure what is called the propeller shaft drop or propeller wear down. Profile gauge are metrology instruments used to identify thread pitch sizes or to determine the flatness of surfaces. When readings are taken simultaneously, it is possible (with the use of psychrometric tables) to determine the relative humidity and dew-point temperature of the air. As stated, this is usually done with an aneroid. These are some of the essential instruments when it comes to ships. The telescopic rods are what measure the distance of the bore, with the help of a micrometer. The other is the total height of the tank which is a known value. Depth gauge: A depth gauge is used to measure the depth of a slot, hole or any other surface of an object. A traditional thermometer consists of mercury, red spirit or green spirit in a glass tube and operates on the principle that the liquid expands more than the glass does when heated. It may be made up of concrete. They can be used to measure all sorts of things like height or weight of objects, the width of the spaces between gaps, the thickness of objects, the diameters of circular objects and all other kinds of geometrical parameters. When we take out the tape, we can measure the level of the liquid by using the scale on the tape. Every ship requires flawless integration of millions of parts and instruments. As the earth rotates the position of the spot moves across the card. This instrument can be of any type like a scale, a tape, a dial or even a digital instrument. A standard shelter for housing four types of thermometers: dry, wet, maximum and minimum. Dial bore gauge heads come in graduated sizes. Steve Nix. Your email address will not be published. Surface Measuring Instruments. It is not used as much as a standard feeler gauge and is only preferred in certain situations. An instrument which records the environmental temperature and humidity at the same time, usually both continually. It worked OK for my purposes (cylinder bore measurement using a telescoping gauge), but I had some difficulty checking the calibration with the included 3" standard. Common Forecast Terms and Weather Systems, Weather Elements and Instruments Used for Measurement. A liner measurement tool (LDM) is used to measure the wear down. It is made up of steel and is flexible. An engine indicator diagram tool is a cylindrical shaped device. Ruler and Scales. It has two scales namely the main scale and Vernier scale both of which are needed to measure a particular object. Top 10 Free Marine Compass Apps For Android Smart Phones, Top 15 Largest Cruise Ships in %currentyear%, 4th Engineer On A Ship: Duties & Responsibilities. It is a lead wire is a metallic wire which can vary in thickness. Plug gauges are usually made double-ended for checking two dimensions. It also has a pointer that shows the measurement. Medium pressure C. High pressure ... D. 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