|LECTURE DEMONSTRATION MANUAL | Instructional Research Lab : ucla physics|
|main page||Dissectable Leyden Jar|
|table of contents|
E.1.5 Dissectable Leyden Jar
This is a very impressive demonstration which will draw lots of comment! It can be used to emphasize the difference between conductors and insulators.
The dissectable Leyden jar is charged up with a Van de Graaff and then discharged by shorting the inner and outer can to show charge storage. Then the jar is recharged and disconnected from the Van de Graaff. The inner can is lifted out with an insulated tool, or, with care, by hand. At this point the parts of the jar are safe to handle, and the glass jar can be lifted out, the inner and outer cans touched to each other, or touched to the glass jar in any combination. You can even give the pieces to the students to handle.
When the Leyden jar is reassembled, the last step of inserting the inner can being done carefully, it will be found that the jar is still charged, as can be checked by shorting its terminals and drawing a spark.
The discovery of the Leyden jar as described in a letter written by Musschenbroeck to Reaumur