|Title||Unpublished letter, on a scheme for perpetual motion from anonymous author to unknown recipient|
|Date||13 November 1784|
|Description||The author describes his proposed scheme for a perpetual motion machine and the way in which to construct it. The author wished to remain anonymous until such time as his machine is deemed a success. Includes a diagram within the text.|
Written in London.
|Physical description||Ink on paper|
|Related records in the catalogue||AP/5/5/1|