The Rumford Spectroheliograph of the Yerkes Observatory

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The Rumford Spectroheliograph was a groundbreaking device used to study the sun's magnetic field and solar activity. In this book, Ellerman and Hale describe the development and use of the instrument, as well as their findings and implications for the field of astronomy. With numerous illustrations and photographs, this book is an important resource for anyone interested in the history of astronomy and solar physics.