' ... originally published in "Notes and Records of the Royal Society" (Vol. 18, no. 2, December 1963[)] ... [and now published] in an amended form ... ' - Preface.
John Harrison, Copley medallist and the £20,000 longitude prize by H. Quill. ISBN 0901180130. Published by Antiquarian Horological Society in 1976. Publication and catalogue information, links to buy online and reader comments.