Mr. Horrox professeth that little touch which I gave him hath ravished his mind quite from itself and left him in an Exstasie between Admiration and Amazement. I beseech you Sir, slack not your Intentions for the Perfection of your begun Wonders. Sadly, Horrocks died before he could try out the instruments, but Crabtree and Gascoigne did use them to try to corroborate Horrocks's theories about the elliptical orbit of the Moon. This invention was later taken up and improved by the scientist and astronomer Richard Towneley who was the nephew of Gascoigne's friend Christopher Towneley. Towneley later brought the instrument to the attention of Robert Hooke, who used it to calculate the size of comets and other celestial bodies. The micrometer, as it became known, was to lie at the heart of astronomical measurement down to the twentieth century. In 1642, civil war broke out in England, and Gascoigne received a commission as Providore for Yorkshire in the army of King Charles I. Crabtree lived in Broughton, just outside Manchester which was on the parliamentary side and all correspondence between the two ceased. Gascoigne died at the Battle of Marston Moor, Yorkshire, on 2 July 1644 as did Charles Towneley, the father of his friend Richard Towneley. After Gascoigne's death some of his papers and fragments of correspondence between Crabtree and Gascoigne came into the possession of Christopher and Richard Towneley. They brought them to the attention of John Flamsteed, the first Astronomer Royal, who came to see Horrocks, Crabtree, and Gascoigne as the founding fathers of British research astronomy and the intellectual heirs of Galileo and Kepler. He began his massive three-folio volume Historia Coelestis Britannica (1725) by printing five pages of their surviving letters and observations, made between 1638 and 1643. Many of Gascoigne's papers and correspondence were lost during the English Civil War and later in the Great Fire of London, but most of what is known to remain is kept in the Bodleian Library at the University of Oxford. Legacy In March 2018 Leeds Civic Trust unveiled a blue plaque in the city honouring Gascoigne. It was unveiled by David Sellers, who has written a biography of Gascoigne, who said: Although his name is known by astronomers, his role as a pioneer in precision astronomy deserves wider public recognition. I hope that this plaque will help to achieve this and will encourage young people to