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Alarm An example of a early alarm.... |
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Echo "Where to stand so that an echo may be heard relative to the source." -Comstock 1850... |
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Hemholtz resonator "Hemholtz constructed a series of resonators, each one of which responds powerfully to a single tone of certain pitch or wavelength. they are metallic vessels, nearly spherical, having an opening, as ... |
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Microphone An instrument invented byProf. Hughes in 1878, and which is used to increase the intensity of low sounds.... |
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Organ pipe, fundamental frequency "Procure an open organ-pipe, at least one side of which is made of glass. While the pipe is emitting its fundamental tone, lower a small ring with a paper bottom, on which a little fine sand has been ... |
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Reflection "Reflection of sound." -Comstock 1850... |
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Reflection "Hold a lamp reflector or other large concave mirror directly facing the sun, so as to bring the rays of light to a focus...At some point, W, between F and C, the center of curvature of the reflector,... |
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Reflection in a circle "In a circle, sound is reflected from every plane surface placed around it, and hence, if the sound is emitted from the centre of a circle, this centre will be the point at which the echo will be most... |
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Refraction "Fill with carbon dioxide a large rubber toy balloon or other double-convex lens having easily flexible walls. Suspend a watch, and place yourself so that you can just hear its ticking. Have the gas-f... |
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Resonance, water and tuning fork "Hold a vibrating tuning fork over the mouth of a cylindrical jar about 10 or 18 inches deep, and notive the feebleness of the sound. Pour in water, as shown, and notive that, when the liquid reaches ... |
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Reverberation "How sound reverberates." -Comstock 1850... |
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Savart bell and resonator "...represents a Savart bell and resonator. The length of the resonant air-column is changed by means of the moveable bottom of the resonator, which is to be adjusted by trial for resonant effect." -A... |
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Siren "Rotate the disk slowly, blowing meanwhile through a tube of about 3/16 inch bore, the nozzle of the tube being held opposite the interior ring of holes. As each successive hold comes before the end o... |
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Siren "Sound siren used to reproduce the sound generated by the tuning fork." -Avery 1895... |
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Sonometer "Device used to convieniently study musical tones." -Avery 1895... |
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Sonometer A sonometer is an apparatus by which the transverse vibrations of strings can be studied. It is also called the monocord because it often has only one string. On the box are two fixed bridges, near th... |
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Sonometer, flame "Apparatus used that will show changes in the flame upon the glass sheet M, when sound is introduced into the tube at A." -Avery 1895... |
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Sound wave "Bow or pluck the string of a sonometer near its end, thus setting it in vibration as a hole. The string will have the appearance of a single spindle as shown, and will sound the lowest tone that it i... |
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Sound wave "Lightly touch the wire at its middle point with the tip of the finger or the beard of a quill; the wire will vibrate in halves." -Avery 1895... |
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Tone An example of how to produce a tone. This illustration shows one end of a string fixed to a hook and suspending a weight from the other end. When you pluck the string it causes it to make a musical ... |
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Tone "A glass bell is fixed to stand, and beside it is a stand carrying a small ivory ball. This is so arranged that the ball shall just rest against the rim of the glass, Now let the violin bow be rubbe... |
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Tone "If a light strip of steel is firmly gripped at one end in a vice and the other end plucked aside, it will, when let go, vibrate backwards and forwards as shown; and if the vibrations are sufficiently... |
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Tuning Fork A tuning fork is an acoustic resonator in the form of a two-pronged fork with the tines formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set ... |
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Tuning fork and box A tuning fork on top of a hollow box.... |
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Vibrations "Grasp one end of a straight spring made of hickory or steel in one end of a vise, as shown. Pluck the free end of the spring so as to produce a vibratory motion. If the spring is long enough, the vib... |
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Clipart ETC is a part of the Educational Technology Clearinghouse and is funded by various grants. Produced by the Florida Center for Instructional Technology, College of Education, University of South Florida. Email the project manager.