| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 3B27.00 | Compound Waves | | |
| 3B27.10 | slinky and soda cans | PIRA 1000 | |
| 3B27.10 | slinky and soda cans | 3B27.10 | Persons at each end of a stretched slinky generate a pulse. The addition of the pulses kicks one soda can out from a line of cans placed along the slinky. Also cancel opposite pulses. |
| 3B27.15 | wave superposition - Shive model | PIRA 1000 | |
| 3B27.15 | wave superposition | Disc 09-16 | Start positive pulses from each end of a Shive wave machine. |
| 3B27.20 | adding waves apparatus | PIRA 1000 | |
| 3B27.20 | adding waves apparatus | 18-8.5 | A framework allows brass tubes representing two sine waves to be combined point by point to give the resultant. Projected on the overhead. |
| 3B27.21 | harmonic sliders | TPT 28(8),568 | A template with a sine wave shape is slid under a set of vertical wood bars cut to various lengths to forming a different sine waves. |
| 3B27.21 | adding waves | 18-8.7 | A machine with pins cut to form a sine wave riding on a plate machined to a sine wave. Picture. Construction details in appendix, p. 635. |
| 3B27.21 | wave addition model | S-28 | Stack several sets of vertical rods that describe sine waves to show the resultant. |
| 3B27.22 | carousel waves | 18-8.14 | 630 knitting needles are mounted on a bicycle wheel riding on a second coaxial bicycle wheel with a sine wave cam. Pictures. Construction details in appendix, p. 639. |
| 3B27.23 | wood block interference | 18-8.6 | A framework holds wood blocks cut to length to form a sine wave. A template in the shape of another wave is pushed against the bottom of the blocks. |
| 3B27.30 | double pendulum beat drawer | PIRA 1000 | |
| 3B27.30 | beat pendula | Si-6 | Two physical pendula with slightly different periods oscillate in parallel planes and the sum is shown by reflecting a laser beam off mounted mirrors. |
| 3B27.30 | sand pendulum compound wave | S-42 | A compound sand pendulum with both oscillations in the same plane dumps onto an endless belt. |
| 3B27.31 | beat pendula | 18-4.1 | Three mirrors are mounted on two pendula of slightly different frequencies. Two show the motion of each pendulum and one shows the combination. Pictures, Diagram. Construction details in appendix, p. 625. |
| 3B27.32 | recording beat pendula | 18-4.2 | Inductive pickup of the position of two pendula of slightly different frequencies. Construction details. |
| 3B27.33 | photo of beat pendula | 18-4.3 | Lenses on beat pendula focus spots of light on moving photographic paper. |
| 3B27.35 | turntable oscillators | AJP 35(11),1043 | A phono turntable drives a horizontal platform in SHM, and two can demonstrate beats and Lissajous figures. |
| 3B27.40 | beats | S-106 | Light is reflected off mirrors on two slightly different tuning forks to a rotating mirror and onto a screen. |
| 3B27.45 | beat lights | 33-2.8 | The output of an audio oscillator is added to line frequency through a step-up transformer with 15W lamps as indicators. |