ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Century astronomical chronograph. Historical artwork of an American astronomical chronograph from 'Handbook of Descriptive and Practical Astronomy' (1890). These devices were used to record measurements over time, using mechanical or electrical methods to trigger the recordings. The apparatus would involve a clock, as well as a recording mechanism.
Model release not required. Property release not required.