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panied by his brother, Dr. Ball, October 13. 1665. at six of the Clock, at Mainhead near Exeter in Devonshire, with a very good Telescope near 38 foot long, and a double Eye-glass, as the observer himself takes notice, adding, that he never saw that Planet more distinct. The observation is represented by Figure 3.
Figure 3
concerning which, the Author saith in his letter to a friend, as follows; This appear'd to me the present figure of Saturn, somewhat otherwise, than I expected, thinking it would have been decreasing, but I found it full as ever, and a little hollow above and below. Whereupon the Person, to whom notice was sent hereof, examining this shape, hath by Letters desired the worthy Author of the Systeme of this Planet, that he would now attentively consider the present Figure of his Anses or Ring, to see whether the appearance be to him, as in this Figure, and consequently whether he there meets with nothing that may make him think, that it is not one body of a Circular Figure, that embraces his Diske, but two.
And to the end that other Curious men, in other places might be engaged, to joyn their Observations with him, to see, whether they can find the like appearance to that, represented here, especially such Notches or Hollownesses, as at A and B, it was thought fit to insert here the newly related Account.
A Relation of some Mercurial Observations, and their Results.
Modern Philosophers, to avoyd Circumlocutions, call that Instrument, wherein a Cylinder of Ouicksilver, of between 28. and 31. Inches in Altitude, is kept suspended after the manner of the Torricellian Experiment; a Barometer or Baroscope, first made publick by that Noble Searcher of Nature. Mr. Boyle, and imployed by Him and others, to detect all the minut variations in the Pressure and weight of the Air. For the more
