| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 3D40.00 | Resonance in Plates, Bars, Soli | | |
| 3D40.10 | xylophone | PIRA 1000 | |
| 3D40.10 | xylophone | 3D40.10 | |
| 3D40.10 | glockenspiel | Sf-5 | A small xylophone can be played to demonstrate the musical scale. |
| 3D40.10 | xylophone | S-7d.2 | A small xylophone. |
| 3D40.10 | xylophone bars | Disc 10-07 | Use a microphone and oscilloscope to display the waveforms of various notes on a xylophone. |
| 3D40.11 | rectangular bar oscillations | PIRA 1000 | |
| 3D40.11 | rectangular bar oscillations | Disc 10-05 | Strike a three foot rectangular bar on different faces and on the end. Listen to the different frequencies. |
| 3D40.12 | high frequency metal bars | PIRA 1000 | |
| 3D40.12 | high frequency metal bars | Disc 10-06 | Hold a metal rod at the midpoint and strike at the end. Two rods an octave apart are shown. |
| 3D40.15 | musical sticks | PIRA 1000 | |
| 3D40.15 | musical sticks | 3D40.15 | A set of wood sticks play a major scale when dropped on the lecture table. |
| 3D40.15 | musical sticks | Sf-6 | A set of wood sticks is cut so they sound the musical scale when dropped. |
| 3D40.15 | musical sticks | S-119 | Directions for making musical sticks. |
| 3D40.15 | musical sticks | S-7d.1 | A set of sticks give a complete scale when dropped. |
| 3D40.16 | musical nails | PIRA 1000 | |
| 3D40.20 | singing rod | PIRA 200 | Hold a long aluminum rod at the midpoint and stroke with rosened fingers. |
| 3D40.20 | singing rod | 3D40.20 | A long aluminum rod will sing when held at the center and stroked with a rosin coated leather. |
| 3D40.20 | singing rods | Disc 10-08 | Hold a long aluminum rod at the midpoint and stroke with rosined fingers. |
| 3D40.21 | singing rod | 19-3.6 | Stroke a 1/2" x 72" aluminum rod while holding at nodes to produce different harmonics. |
| 3D40.23 | bow the vertical rod | S-136 | A long thin rod attached to a short thick rod clamped vertically is bowed and plucked while held at various positions. |
| 3D40.24 | regenerative feedback in rod | AJP 38(9),1152 | A detector at one end, speaker at the other, and an amplifier in between provides a regenerative feedback system for exciting a rod in the fundamental frequency. |
| 3D40.24 | speed of sound in a rod | AJP 41(5),734 | Stroke a loud rod to get a squeal, tune a oscillator and speaker to get rid of beats, and calculate the velocity. |
| 3D40.24 | speed of sound in a metal wire | AJP 42(12),1117 | Wire is stretched tightly and stroked with a wet sponge. |
| 3D40.24 | velocity of sound in a rod | 19-2.2 | A rod clamped in the middle is excited by a coil at one end tuned until a Lissajous pattern is formed on an oscilloscope with the signal from a microphone placed at the other end. |
| 3D40.24 | singing rod | 18-1.1 | A rod is excited electromagnetically at one end and the motion is detected in the same manner at the other end for quantitative studies. |
| 3D40.27 | singing rod | 18-1.2 | Find Young's modulus by finding the sag in a rod and then compare the frequency of the fundamental mode with theory. |
| 3D40.30 | Chladni plate | PIRA 200 | Strike or bow a horizontal metal plate covered with sand while touching the edge at various nodal points. |
| 3D40.30 | Chladni plate | 3D40.30 | A brass plate clamped horizontally in the center is bowed while the edges are touched to provide user selected nodes. Banding sand shows patterns of oscillations. |
| 3D40.30 | Chladni plates | Sb-3 | Bow the Chladni plate while damping at node locations with a finger. |
| 3D40.30 | Chladni plates | 19-4.2 | Excite the Chladni plates with a cello bow. Picture. |
| 3D40.30 | Chladni plate | S-137 | A horizontal metal plate covered with sand is struck or bowed while touching the edge at various nodal points. |
| 3D40.30 | Chladni plates | S-7e | Bow circular and square Chladni plates. |
| 3D40.30 | Chladni plates | Disc 09-30 | A plate is driven by magnetostriction in the 10 to 30 Khz range. |
| 3D40.31 | Chladni plates | Sb-1 | Sprinkled sand shows standing waves on a circular metal plate driven at the center by an oscillator. |
| 3D40.31 | Chladni plates | S-138 | Drive a Chladni plate from the center. |
| 3D40.32 | Chladni plates on the OH | AJP 59(7),665 | Directions for making a loudspeaker driven Chladni plate for the overhead projector. |
| 3D40.32 | Chladni plates | 19-4.1 | Chladni plates are driven from above by a loudspeaker. Pictures. |
| 3D40.33 | thick Chladni plate | PIRA 1000 | |
| 3D40.33 | thick Chladni plate | 3D40.33 | A circular disc of 1/2" aluminum exhibits a single pattern. |
| 3D40.34 | Chladni plates | AJP 50(3),271 | After some interesting historical and general comments, nonflat plates (cymbals, gongs, etc.) are examined. |
| 3D40.35 | flaming table | PIRA 1000 | |
| 3D40.35 | flaming table | 3D40.35 | Same as AJP 55(8),733. |
| 3D40.35 | 2-D flame table | AJP 55(8),733 | Two-dimensional rectangular and circular flame tables, extensions of the one-dimensional Rubens tube, are shown in some lower order modes |
| 3D40.35 | flaming birthday cake | Sb-2 | Flames from a two dimensional array driven by a speaker show many resonant modes. |
| 3D40.36 | 2D flame table analysis | AJP 56(10),913 | An analysis of the two dimensional flame table. |
| 3D40.40 | drum head | PIRA 500 | |
| 3D40.40 | Chladni figures - tympani head | AJP 51(5),474 | Drive a timpani head with a loudspeaker.
|
| 3D40.40 | standing waves on a drum | AJP 35(11),1029 | A speaker drives a circular rubber membrane under tension while illuminated with a strobe. |
| 3D40.40 | standing waves in a drum | 19-4.12 | A circular rubber membrane with a pattern is illuminated with a strobe and driven from below by a 12" loudspeaker. Pictures. |
| 3D40.40 | drumhead | Disc 09-29 | A speaker drives a drumhead. |
| 3D40.41 | vibrations in a circular membrane | AJP 36(8),669 | The eigenfrequencies of (21) agree closely with the theoretical values. Air damping is removed by using a wire mesh driven magnetically. |
| 3D40.45 | bubble membrane modes | PIRA 1000 | |
| 3D40.45 | bubble membrane modes | 3D40.45 | Use a large right angle PVC fitting. |
| 3D40.45 | soap film membrane modes | AJP 33(11),xvii | Light from a slide projector is reflected off a soap film with a black cloth and speaker behind. |
| 3D40.45 | bubble membrane modes | AJP 59(4),376 | A simple technique to drive bubble membranes of various shapes with a speaker. |
| 3D40.50 | musical goblet | PIRA 1000 | |
| 3D40.50 | musical goblets | Se-8 | Rub the edge of a goblet with a wet finger. |
| 3D40.50 | glass tumbler | S-7d.3 | Rub a finger dipped in vinegar around the top of a crystal goblet. |
| 3D40.51 | standing waves in a bowl | 18-5.6 | A 15 l flask is cut in half to form a bowl which is bowed to produce standing waves. Suspended ping pong balls indicate nodes and loops. |
| 3D40.51 | bowing the bowl | S-139 | Suspend four pith balls so they touch the edge of a bowl and bow between two of the balls. |
| 3D40.52 | "whispering" waves in a wineglass | AJP 53(11),1070 | A thorough discussion of surface waves in vessels, including ethylene glycol in a trifle dish. |
| 3D40.52 | wineglass acoustics | AJP 51(8),688 | A study of wineglass acoustics. |
| 3D40.53 | wine glass waves, etc. | TPT 28(9),582 | Seven questions about wine glass waves are answered. Pictures of a glass harmonica and a Chinese "water spouting basin". |
| 3D40.55 | shattering goblet | PIRA 500 | |
| 3D40.55 | shattering goblet | AJP 47(9),828 | Laboratory beakers are shattered in a chamber with a small piece of folded paper over the rim serving as a resonance detector. |
| 3D40.55 | shattering goblet | TPT 28(6),418 | Break a lead crystal goblet with amplified sound. |
| 3D40.55 | glass breaking with sound | Disc 09-06 | Large amplitude sound at the resonant frequency is directed at a beaker. |
| 3D40.60 | wind chimes | AJP 58(1),82 | Directions for making wind chimes. Some discussion of the perception of complex tones. |
| 3D40.60 | aeolian "bull roarer" | S-143 | The Australian "bull-roarer" produces a loud noise due to eddies in the air. |
| 3D40.65 | bull roarer | PIRA 1000 | |
| 3D40.90 | spherical oscillations movie | AJP 53(6),579 | A description by the author of a computer generated movie of spherical oscillations. |