| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 5G50.00 | Temperature and Magnetism | | |
| 5G50.10 | Curie point | PIRA 500 | |
| 5G50.10 | Curie point | 5G50.10 | Iron under magnetic attraction is heated until it falls away. Upon cooling it is again attracted. |
| 5G50.10 | Curie temperature | Es-8 | A counterweighted iron wire is attracted to a magnet until heated red with a flame. |
| 5G50.11 | Curie point | Es-6 | A long soft iron wire held up by a magnet falls off when the wire is heated past the Curie point. |
| 5G50.11 | Curie Point | E-104 | A length of soft
iron wire heated with 110 V DC through a rheostat shows loss of magnetic
properties when it passes through recalescence. |
| 5G50.12 | Curie point | 32-3.20 | A pendulum bob
with iron wire tips is attracted to a magnet where it is heated until it
loses its magnetism and falls away. The cycle repeats. Picture, Diagram. |
| 5G50.13 | Curie point with monel metal | AJP 37(3),334 | Monel metals have curie points between 25 C and 100 C depending on the alloy. |
| 5G50.14 | Curie temperature | E-10a.1 | A nickel wire falls away from a magnet when heated. |
| 5G50.15 | Curie nickel | PIRA 1000 | |
| 5G50.15 | Curie point of nickel | E-103 | A rod of nickel is attracted to a magnet when cool but swings away when heated. Many hints and diagram. |
| 5G50.15 | Curie Nickel | Disc 19-24 | A Canadian nickel is attracted to a magnet until it is heated with a torch. |
| 5G50.16 | nickel hysteresis surface | AJP 56(1),45 | Pictures of a 3-D HMT hysteresis surface for nickel. |
| 5G50.20 | thermomagnetic motor | PIRA 1000 | |
| 5G50.20 | thermomagnetic motor | 32-3.22 | Local heating of permalloy tape or nickel rings in a magnetic field will cause rotation. AJP 5(1),40. |
| 5G50.20 | Monel wheel | 32-3.21 | The rim of a wheel of Monel tape is placed in the gap of a magnet and heat is applied to one side to make the wheel turn. |
| 5G50.20 | magnetic heat motor | E-110 | A thin
strip of magnetic alloy around the rim of a well balanced wheel is placed
in the gap of a magnet with a light focused on a point just above the magnet.
Heating changes the magnetic properties and the wheel rotates. |
| 5G50.20 | Curie temperature wheel | Disc 19-25 | A rim of nickel on a wheel is heated just above the point where the rim passes through the gap of a magnet. |
| 5G50.22 | magnetic heat engine | AJP 58(6),545 | A
gadolinium strip forming the rim of a plexiglass wheel is heated and cooled
on opposite sides of a magnetic field, and a weight is lifted by the resulting
rotation. |
| 5G50.23 | Curie temperature motor | E-10a.2 | A soft iron disk heated on an edge turns very slowly when a magnet is oriented correctly. |
| 5G50.24 | Curie point engine | AJP 55(1),48 | Use the Curie point engine as a simple demonstration of the Carnot principle. |
| 5G50.25 | dysprosium in liquid nitrogen | PIRA 1000 | |
| 5G50.25 | dysprosium in liquid nitrogen | Disc 19-23 | A piece of dysprosium is attracted to a magnet when cooled to liquid nitrogen temperatures but drops away when it warms up. |
| 5G50.30 | phase change and susceptibility | 32-3.19 | Heat
the long iron wire and watch the sag. A ferrite ring and coil connected to
a galvanometer show change in ferromagnetic susceptibility. |
| 5G50.35 | hysteresis breakdown at Curie temp. | 32-3.18 | Elaborate
apparatus to show hysteresis loop and breakdown at Curie temperature. Picture,
Diagrams, Materials list in appendix, p. 1333. |
| 5G50.40 | adiabatic demagnetization | 32-5.1 | The temperature of a piece of gadolinium is measured with a thermocouple while it is between the poles of an electromagnet. |
| 5G50.50 | Meissner effect | PIRA 200 | Cool a superconductor and a magnet floats over it due to magnetic repulsion. |
| 5G50.50 | Meissner effect | 5G50.50 | |
| 5G50.50 | superconductors | Disc 16-14 | Place a small powerful magnet over a disc of superconducting material cooled to liquid nitrogen temperature. |
| 5G50.51 | levitating magnet | TPT 28(4),205 | A long article on levitation over superconductors showing several variations. |
| 5G50.52 | Meissner effect | AJP 56(7),617 | Repulsion of the magnet and superconductor hanging from threads. Also, levitation of the magnet over the superconductor. |
| 5G50.53 | Meissner effect with a cork and salt | AJP 56(11),1039 | A magnet/cork in a vial filled with salt water so the float just sinks is placed over the superconductor. |
| 5G50.55 | Meissner effect with liquid He | AJP 39(1),113 | Technique for levitating a magnet over liquid He. |
| 5G50.55 | floating magnet demonstration | TPT 28(6),395 | A
room temperature magnet is suspended 2 cm above a liquid helium cooled (5l/hr)
lead plate in a supercooled container. Students can play with the magnet
and feel the force. Discussion of what the Meissner effect really is. |
| 5G50.56 | detailed explaination of levitation | AJP 59(1),16 | Theoretical
article - a discussion of levitation and other effects using Maxwell's work
on eddy currents in thin conducting sheets instead of the London equation. |
| 5G50.58 | Meissner oscillator | AJP 57(10),955 | A pivoting needle with magnets on the ends oscillates between two superconducting discs. |