The Linköping documents were photolithographed by Rudolf Tafel ca. 1869, and they included Swedenborg’s experiment titled “Om Echo,” (Regarding Echo) (1716) from which can be deduced a rough estimate of the speed of sound.
Swedenborg Scientific Association
The Swedenborg Scientific Association’s primary purpose is to make the scientific and philosophical works of Emanuel Swedenborg available as widely as possible. We do this by preserving, translating (into many languages), publishing, and distributing this material.
Many back issues of The New Philosophy are available to browse or search online.