Robert Hooke

quickly led me to the use of springs, instead of gravity

The success of these made me further think of improving it for finding the longitude; and the method

I apply'd myself to the improving of the pendulum for such observations

having an opportunity of acquainting myself with astronomy

not designing to trouble my self any further with him, unless he gives me occasion, I dismiss him

how could he be sure of a Negative? Whom I have not acquainted with my Inventions, since l looked on him as one that made a trade of Intelligence.

The Publisher of Transactions in that of October 1675 indeavours to cover former injuries done me by accumulating new ones

The true Mathematical and Mechanical Form of all manner of Arches for building with the true butment necessary to each of them, a Problem which no Architectonick Writer hath ever yet attempted, much less perform'd. ...Ut pendet continaum …

the Animadvertor both contrived some hundreds of Instruments, each of very great accurateness for taking Angles, Levels, &c. and a particular Arithmetical lnstrument for performing all Operations in Arithmetick, with the greatest ease, …

an Instrument of 3 foot Radius with Telescopes, will do more then one of 3 score foot Radius with common Sights

so great curiosity as Hevelius strives for is needless without the use of Telescopic Sights

his instruments do not much exceed Ticho.

this I durst promise the Undertaker, that he will find all the great Motions of the World to be influenced by this Principle, and that the true understanding thereof will be the true perfection of Astronomy.

will mightily assist the astronomer to reduce all the Cœlestiall motions to a certaine rule, which I doubt will never be done true without it.

these attractive powers are so much the more powerful in operating, by how much nearer the body wrought upon is to their own Centers.

all bodys whatsoever that are put into direct and simple motion, will so continue to move forward in a streight line, till they are by some other effectual powers deflected and bent into a Motion describing a Circle, Ellipsis, or some …

all Cœlestial Bodies whatsoever, have an attraction or gravitating power towards their own Centers

This depends upon three Suppositions

I shall explaine a Systeme of the World

I have in some of my foregoing observations discovered some new Motions even in the Earth it self, which perhaps were not dreamt of before

a kind of solid or hardned froth, or a congeries of very small bubbles consolidated in that form, into a pretty stiff as well as tough concrete, and that each Cavern, Bubble, or Cell, is distinctly separate from any of the rest, without …

in 1658 or 1659 I continued and perfected the air-pump for Mr Boyle, having first seen a contrivance for that purpose made for the same honourable person by Mr Gratorix, which was too gross to perform any great matter.