

This seminal work by Charles Augustus Young, Edward Charles Pickering, and Samuel Pierpont Langley describes the design and operation of a photometer for measuring the brightness of stars. With detailed diagrams and explanations, this volume is a foundational text for anyone...


This seminal work by Charles Augustus Young, Edward Charles Pickering, and Samuel Pierpont Langley describes the design and operation of a photometer for measuring the brightness of stars. With detailed diagrams and explanations, this volume is a foundational text for anyone...