| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 5K20.00 | Eddy Currents | | |
| 5K20.10 | Eddy currents in pendulum | PIRA 200 | A copper sheet and comb, ring and broken ring are swung through a large electromagnet. |
| 5K20.10 | pendulum in big electromagnet | 5K20.10 | Pendula of solid and comb-like copper plates, solid and slit copper rings are swung through a large electromagnet. |
| 5K20.10 | Eddy current pendulum | AJP 30(6),453 | Apparatus
Drawings Project No. 29: Large electromagnet accessories, one of four. Plans
for a large eddy current pendulum to go on the large electromagnet from No.
13. |
| 5K20.10 | Eddy currents in pendulum | El-3 | A copper sheet and comb, ring and broken ring are swung through a large electromagnet. |
| 5K20.10 | Eddy current pendulum | Disc 20-24 | Copper, wood, etc. bobs are swung in a large permanent magnet. |
| 5K20.11 | magnetic brake | E-227 | A heavy copper disk swings as a pendulum between the poles of an electromagnet. |
| 5K20.11 | Eddy current pendulum | E-8d.2 | A pendulum with a copper plate bob is swung through a big electromagnet. |
| 5K20.15 | Eddy damped pendulum | PIRA 1000 | |
| 5K20.15 | eddy damped pendulum | 5K20.15 | A magnet pendulum bob is swung over copper, aluminum, and stainless plate. |
| 5K20.15 | eddy damped pendulum | El-2 | A bar magnet suspended as a pendulum is damped as it swings over a copper plate. |
| 5K20.20 | falling aluminum sheet | PIRA 1000 | |
| 5K20.20 | falling aluminum sheet | 5K20.20 | An aluminum sheet is dropped through the poles of a large horseshoe magnet. |
| 5K20.20 | falling aluminum sheet | El-4 | A strip of aluminum sheet is allowed to fall between the poles of a large Alnico magnet. |
| 5K20.22 | Eddy current brake | AJP 35(7),iv | Fasten a large aluminum disk to a 1/4 hp motor and then bring a magnetron magnet to the edge of the disk to slow the motor down. |
| 5K20.25 | magnets in Eddy tubes | PIRA 200 | Drop a magnet and a dummy in glass and aluminum tubes, then switch. The magnet in Al falls slowly. |
| 5K20.25 | magnets and eddy tubes | 5K20.25 | |
| 5K20.25 | Eddy current tubes | Disc 20-26 | Drop a magnet and a dummy in glass and aluminum tubes, then switch. |
| 5K20.26 | Faraday repulsion coil | PIRA 1000 | |
| 5K20.26 | forces due to induced current | Ek-1 | Pull a light bifilar suspended aluminum ring with a magnet. |
| 5K20.26 | Faraday repulsion coil | Disc 20-19 | Thrust the pole of a magnet in and out of a copper ring of a bifilar suspension. |
| 5K20.30 | jumping ring | PIRA 200 | A solid aluminum ring on the vertical transformer jumps while a split ring does not. |
| 5K20.30 | jumping ring | 5K20.30 | Aluminum rings, one slit, the other solid, are placed around the core of a coil and the the coil is energized. |
| 5K20.30 | jumping ring | Em-12 | An aluminum ring jumps off the iron core of a vertical inductor. |
| 5K20.30 | jumping ring | E-236 | Solid and split aluminum rings on the vertical transformer. |
| 5K20.30 | Thompson's flying ring | Disc 20-18 | A copper ring levitates, an aluminum ring flies off, a slit ring does nothing, and a cooled ring flies higher. |
| 5K20.31 | jumping ring analysis | AJP 39(3),285 | An analysis of the role of phase differences in the levitating ring demonstration. |
| 5K20.31 | jumping ring analysis | AJP 54(9),808 | An analysis of the role of phase differences in the levitating ring demonstration. |
| 5K20.31 | jumping ring analysis | 31-2.9 | Be careful how you analyze the jumping ring. References. |
| 5K20.35 | frying egg | El-5 | A copper sheet fitting over the core of a large solenoid gets hot enough to fry an egg. |
| 5K20.36 | boil water on the vertical transform | E-237 | Boil water in a ring shaped trough on the vertical transformer. |
| 5K20.40 | Eddy current levitator | PIRA 500 | |
| 5K20.40 | Eddy current levitator | 5K20.40 | |
| 5K20.40 | Eddy current levitation | El-1 | A strong ceramic magnet is levitated over a spinning aluminum disc. |
| 5K20.41 | electromagnetic levitator | AJP 31(12),925 | Plans
for an electromagnetic levitator that lifts a 18" dia. 1/16" thick aluminum
pan. Weighs 100 lbs, requires only 400 W at 110 V. |
| 5K20.41 | large levitator | 31-2.22 | Directions for building a large levitator. Diagrams, Construction details in appendix, p. 1332. |
| 5K20.42 | Arago's disk | PIRA 1000 | |
| 5K20.42 | Arago's disk | AJP 28(8),748 | Support the horseshoe magnet by a bight with stranded string and "wind up" the string to get a high spin rate. |
| 5K20.42 | Arago's disk | E-226 | A magnet suspended above a rotating horizontal copper disk will rotate. |
| 5K20.42 | rotating magnet | E-8d.1 | A magnet needle over a rotating copper disk. |
| 5K20.42 | Arago's disk | Disc 20-25 | A bar magnet suspended above a spinning aluminum disc will start to rotate. |
| 5K20.43 | rotating vertical disc | AJP 47(5),470 | A magnet hung by a quadrafilar rolling suspension near a spinning aluminum disk shows both repulsive and retarding forces. |
| 5K20.50 | rotating ball | PIRA 1000 | |
| 5K20.50 | rotating ball | Em-13 | A hollow aluminum ball rotates in a watch glass atop a shaded pole transformer. |
| 5K20.50 | spinning ball on a dish | 31-2.18 | A half disc of sheet aluminum placed on an ac excited coil produces a rotating magnetic field the at causes a ball to spin. |
| 5K20.51 | magnetic stirrer demonstrations | AJP 45(11),1020 | Several
eddy current demos including a paradox: place a steel ball on a stirrer and
start it up, the ball rolls in one direction, but backwards when placed in
while the stirrer is on. |
| 5K20.52 | Eddy current motor | 31-2.19 | A metal 35 mm film canister spins when mounted to one side of the pole of an electromagnet. |
| 5K20.55 | rotating aluminum disc | 31-2.8 | An
aluminum disc rotates when held asymmetrically over a vertical solenoid powered
by line ac unless shielded by an aluminum plate. |
| 5K20.56 | spinning aluminum discs | 31-2.6 | Two
overlapping rotating aluminum discs in parallel planes on the same rigid
support rotate in different directions when inserted into a magnetic field.
Needs a Diagram. |
| 5K20.57 | rotating aluminum disc | 31-2.7 | A thin
aluminum disc hung vertically between the poles of a vertically mounted horseshoe
magnet rotates when the magnet is rotated. |
| 5K20.58 | one-piece Faraday generator | AJP 46(7),729 | Instead
of a conducting disk rotating in an axial magnetic field, the disk is replaced
by a cylindrical permanent magnet that supplies its own magnetic field. |
| 5K20.59 | magnetic curl meter | AJP 40(2),330 | Faraday's
"electromagnetic rotation apparatus" shows a magnet in a conducting fluid
rotating continuously when suspended in a region of distributed current density.
This device measures the torque on such a magnet. |
| 5K20.60 | Eddy currents in Barlow's wheel | E-225 | Attach the Barlow's wheel to a galvanometer and turn by hand. |
| 5K20.62 | money sorter | El-6 | Silver and ersatz quarters are dropped through a large magnet. |
| 5K20.63 | rotating cores in magnet | 31-2.5 | A copper loop, solid iron cylinder, and laminated iron cylinder are each rotated while suspended in a magnetic field. |
| 5K20.65 | electromagnetic can breaker | PIRA 1000 | |