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Historically, the definition of a scientific instrument has varied, based on usage, laws, and historical time period. [1] [2] [3] Before the mid-nineteenth century such tools were referred to as "natural philosophical" or "philosophical" apparatus and instruments, and older tools from antiquity to the Middle Ages (such as the astrolabe and pendulum clock) defy a more modern definition of "a ...
The criteria for classifying musical instruments vary depending on the point of view, time, and place. The many various approaches examine aspects such as the physical properties of the instrument (shape, construction, material composition, physical state, etc.), the manner in which the instrument is played (plucked, bowed, etc.), the means by which the instrument produces sound, the quality ...
Instrumentation is a collective term for measuring instruments, used for indicating, measuring, and recording physical quantities. It is also a field of study about the art and science about making measurement instruments, involving the related areas of metrology , automation , and control theory .
Military instruments as a class draw on most of the categories of instrument described throughout this article, such as navigation, astronomy, optics, and imaging, and the kinetics of moving objects. Common abstract themes that unite military instruments are seeing into the distance, seeing in the dark, knowing an object's geographic location ...
The Hornbostel–Sachs system categorizes musical instruments by how they make sound. It divides instruments into five groups: idiophones, membranophones, chordophones, aerophones, and electrophones. A number of instruments also exist outside the five main classes.
Instrument Uses Test tube: Folin-Wu tube: Glass slide mycole and cover slips: in microscopy, serology, etc. as the solid backing on which test samples are : Petri dish: used for preparation of culture media and the culture of organisms they are in
2. In a medium bowl, stir the flour, pudding mix, cream of tartar, baking soda and salt. With the mixer on low, gradually add the dry ingredients to the butter mixture, beating just until ...
211.251.2 Instruments in which the end without a membrane is closed; 211.252 Instruments which have two usable membranes 211.252.1 Single instruments; 211.252.2 Sets of instruments; 211.253 Mixed sets of goblet drums; 211.26 Mixed sets of tubular drums; 211.3 Instruments in which the body depth is not greater than the radius of the membrane ...