The eclipseometer

An instrument shewing the course of the eclipse of the sun, every instant of its duration at London, which will happen the 22d. day of April 1715. in the morning, beginning at 8h. 7 1/2: middle at 9h. 14: ending at 10h. 24 1/2; according to a computation made by tables drawn from Sr. Isaac Newtons theory of the moon