Covering the astronomical work achieved with telescopes of moderate size, this volume indicates how recent developments in electronics are making it possible for these telescopes to cope with problems formerly attacked only by the largest instruments. Because the future accomplishments of the telescopes of moderate size should be tremendously increased, this book considers both what is being accomplished and what scientists may confidently expect to be able to do in the predictable future. The result is a book of vital importance to the student of astronomy who wishes to understand the advances made possible by electronic progress.