Magneto Electrical Experiments
Suggested uses in the classroom:
Turn "mechanical energy" into electrical energy.
Show how resistance works in a parallel circuit, reducing the current.
Is this a Tucker Telephone? No, these devices are not designed to torture inmates in the Arkansas State Prison system.
Is this an E-Stim unit? No, these are science experiments, although it does have the same connectors as most e-stim accessories (banana plugs & mini-phono jacks) and the output (when cranked at a reasonable rate) is quite stimulating.
Each of these devices uses a hand-crank magneto generator (from an old telephone) to generate an AC electrical current. These magnetos are connected, in parallel, to 2 or 3 light sockets which are then connected to two terminals. The more light bulbs screwed in, the more resistance is present in the circuit, so the less current to the terminals. The light bulbs do light up if they are screwed in. With all light bulbs screwed in the resulting current is very mild. Without the light bulbs in the circuit the current coming straight from the magneto can be quite "shocking". Some of the stronger devices also have a potentiometer to adjust the output. Others have a switch that engages a working bell.
The screw terminals used on these devices also function as "banana plug" connectors. All units also have a mini-phono jack.
Each mag produces a slightly different wave form. Some are "spikier" than others, some are smoother, and some are stronger.
Magneto Electrical Experiment #1
Western Electric 315H oak ringer box with model 22a magneto, bell reads "patent May 12, 1914". This puts the manufacture date somewhere between 1914 and the mid 1920's. The wiring inside the box is original except for the addition of a toggle switch to disengage the bell. The box is mounted on a bamboo board and connected to two light bulbs and the post/banana connectors as well as the 3.5 mini-phono jack.
Magneto Electrical Experiment #2
Very old (1900?) and rare Stromberg-Carlson(?) magneto with unique parallel gear teeth/cogs, mounted on beautiful Bahama Acacia wood. The magneto is connected to 3 light bulbs and then to the post/banana connectors as well as the 3.5 mini-phono jack.
Magneto Electrical Experiment #3
Western Electric 22a magneto mounted on a wooden board and connected to 2 light bulbs and then to the post/banana connectors as well as the 3.5 mini-phono jack. The 1st and third magnets can be removed to lesson the current output (see picture).
Magneto Electrical Experiment #4
Magneto and bell assembly from a Leich 901 telephone from the 1930's mounted on a bamboo board. These magnetos were much more powerful than the bar-magnet magnetos of earlier years. The magneto is connected to 3 light bulbs and a switch that engages the bell unit. Finally it is connected to a potentiometer to further adjust the current output and then to the post/banana connectors as well as the 3.5 mini-phono jack.
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