In Search of William Gascoigne: Seventeenth Century Astronomer: 390 2012th Edition

From the reviews:

“Sellers … has pulled together copious facts on the little-known astronomer William Gascoigne (c. 1612-44). Gascoigne invented the telescopic sight and micrometer, essential instruments for exact measurements in astronomy. … The book surveys Gascoigne’s life, including the effects of his era’s religious and political climate on his education and development. … Summing Up: Recommended. Specialist audiences including researchers/faculty and professionals.” (M.-K. Hemenway, Choice, Vol. 50 (6), February, 2013)

“Sellers’ book gives a good account of what is known of Gascoigne’s work, and also sets the man in his times. … historians of astronomy will find it extremely useful. This book has clearly been a labour of love, and it fills an important gap in the history of English astronomy. … Sellers has probably told us all that we can hope to learn about William Gascoigne.” (Alan Batten, Journal of Astronomical History and Heritage, Vol. 16 (1), 2013)

“David Sellers has done a splendid job of bringing Gascoigne into broader scholarly understanding…What I believe makes this book especially valuable is its author’s meticulousness as an archival historian, and the large body of primary research data upon which it stands.” -Allan Chapman, The Observatory October 2013

William Gascoigne (c.1612-44), the first inventor of the telescopic sight and micrometer―instruments crucial to the advance of astronomy―was killed in the English Civil War. His name is now known to historians of science around the world, but for some considerable time after his tragic death at the age of 32, it seemed as if his achievements would be consigned to oblivion. Most of his papers were lost in the maelstrom of war and the few that seemed to have survived later disappeared. This is the story of how his work was rescued. Woven into that story is an account of the state of astronomy and optics during Gascoigne’s lifetime, so that the reader can appreciate the significance of his discoveries.

A substantial appendix presents selected extracts from Gascoigne’s correspondence. This includes much new material that has not been previously published and illustrates his efforts to explain the basis of his pioneering techniques to the satisfaction of his contemporaries.