The laboratory notes deal with his storage battery experiments, as well as his later quest to prove his theory of gravitation. Records of note include Show moreThe laboratory notes deal with his storage battery experiments, as well as his later quest to prove his theory of gravitation. Records of note include a 240 page journal which Brush attempts to recount the details of his early experiments in developing the original arc lighting technology in the 1870s. Charles F. Brush, Sr., Papers Show less