Paper, 'An instrument for seeing the Sun, Moon and stars pass the meridian of any place usefull for setting watches in all parts of the world with the greatest exactness; to correct sun-dials; to assist in the discovery of the longitudes of places etc' by William Derham Derham describes using an instrument to make astronomical observations, for the purpose of setting watches and correcting sun dials. He writes: 'Among all the ways contrived for finding the meridian of any place, the most commodious I could ever meet with, or think of for common use, is an Instrument of Sir Christopher Wren's, or two of Mr Gray's or one published in the Appendix of a little Book, called "The Artificial Clockmaker".' Subject: Astronomy / Scientific apparatus and instruments 1705