Sproul ObservatoryThe observatory at Swarthmore College, near Philadelphia, where Peter van der Kamp, Kaj A. Strand, and Sarah Lee Lippincott worked in the middle decades of this century to try to detect planets around nearby stars. Its main instrument during this period was a 24-in. refractor. Related category OBSERVATORIES AND TELESCOPESAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |