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The Royal Society: Science in the Making

Correspondence Explorer

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Showing 54 letters from 1661–1669

0 letters from Robert Moray; 54 letters from Christiaan Huygens

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Concerning some observations of Saturn Read to the Royal Society on 9 October 1661

Reference number: EL/H1/1

Concerning Boyle's astronomical observations

Reference number: EL/H1/2

Stating that his recent studies concern the application of algebra to music in order to aid the division of the monochord Read to the Royal Society on 1 August 1661

Reference number: EL/H1/3

Concerning the controversies between Robert Boyle and Linus about the weight of air; also about the descent of heavy bodies

Reference number: EL/H1/4

Concerning Thomas Hobbes's 'Dialogue' and Digby's book of vegetation; concerning the differences with Frenicle about the form of Saturn; discussing his pneumatic engine

Reference number: EL/H1/5

Considering the hypotheses of Christopher Wren and of Frenicle about the ring system of Saturn; the universal measure; concerning the movement of the pendulum and its length for half a second; discussing an article about Robert Boyle's machine

Reference number: EL/H1/6
1662

Concerning some experiments made with a pneumatic engine; referring to an experiment regarding the sound of a watch in vacuum

Reference number: EL/H1/7

Concerning Christopher Wren's system of Saturn; concerning experiments with the pneumatic engine Read to the Royal Society on 5 March 1662

Reference number: EL/H1/8

Concerning properties of the cycloid; experiments of a vacuum; the establishment of universal measure; maintaining a table for the equation of time Read to the Royal Society on 12 March 1662

Reference number: EL/H1/9

Application of the cycloid to the pendulum clock; finding the weight of air

Reference number: EL/H1/10

Concerning Robert Boyle's answer to Linus; concerning a theory about air; details of an experiment with the pneumatic engine (figure in text) Read to the Royal Society on 30 July 1662

Reference number: EL/H1/11

Concerning the descent of bodies through the air and the Huygenian tables of equation

Reference number: EL/H1/12

Concerning a treatise on the restitution of bodies; concerning the Toricellian experiment; concerning the system of Saturn (with figure in text), and a method for determining longitude

Reference number: EL/H1/13

Concerning Hobbes's duplication of the cube and quadrature of the circle; calculations to show the height of the atmosphere

Reference number: EL/H1/14

Concerning Hobbes's experiments for freeing water from air Read to the Royal Society on 31 December 1662

Reference number: EL/H1/15

Concerning Huygens' answer to Thomas Hobbes's defence of his geometric problems with duplication of the cube and quadrature of the circle Read to the Royal Society on 31 December 1662

Reference number: EL/H1/16

Sends two of his clocks for longitude for consideration by the Royal Society, and sends other books

Reference number: EL/H1/17
1663

Concerns sending clocks for use at sea; concerning a new instrument by Petty; gives an account of his instrument ('rarifying engine' - figure in text); carries out an experiment by Linus and gives his observations

Reference number: EL/H1/18

Concerns sending clocks for use at sea; concerning a new instrument by Petty; gives an account of his instrument ('rarifying engine' - figure in text); carries out an experiment by Linus and gives his observations Read to the Royal Society on 4 February 1663

Reference number: EL/H1/19

Gives congratulations on the establishment of the Royal Society

Reference number: EL/H1/20

Concerning two clocks for use at sea; concerning the non-descent of mercury in a tube ('purged mercury of all air')

Reference number: EL/H1/22

Concerns the use of pendulums at sea and determining longitude; concerning the height of mercury in a tube and repeating the Toricellian experiments; concerning optical glasses without tubes

Reference number: EL/H1/23

Concerns determining longitude by observing the satellites of Jupiter; concerning the descent of mercury in a tube; concerning optical glasses without tubes

Reference number: EL/H1/24

Concerning Huygens' clocks for determining longitude; observations of experiments with mercury in a tube

Reference number: EL/H1/25
1664

Concerning improvements to the new vehicle; concerning the claim of Earl of Kincardin, Alexander Bruce, as the discoverer of longitude by means of a pendulum clock

Reference number: EL/H1/26

Concerning a new mode of transport for two people; concerning experiments with mercury in a tube 'purged of air' Read to the Royal Society on 16 March 1664

Reference number: EL/H1/27

Concerning a new mode of transport in Paris; concerning experiments showing the height of mercury in a tube

Reference number: EL/H1/28

Notices about the dissolution of the Academy of Montmer and other matters

Reference number: EL/H1/30

Concerning several literary notices

Reference number: EL/H1/31

Concerning the compression of air; discussing the measurement of falling bodies; discussing his new clock

Reference number: EL/H1/32

Discussing his new pendulum clock; experiments with musical chords; concerning experiments to show the compression of air; concerning a telescope with a length of 60 feet Read to the Royal Society on 17 August 1664

Reference number: EL/H1/33

Discussing his new pendulum clock; experiments with musical chords; concerning experiments to show the compression of air; concerning a telescope with a length of 60 feet

Reference number: EL/H1/34

Discussing the property of colours; discussing his new pendulum clock; discussing an instrument for measuring the descent of bodies (figure in text); discussing new observations of Saturn (figure in text) from a book sent to him with a letter from Rome Read to the Royal Society on 31 August 1664 Pencil note reads that the pages are 'inverted' ie not in the correct reading order

Reference number: EL/H1/35

Copy by Henry Oldenburg Discussing the property of colours; discussing his new pendulum clock; discussing an instrument for measuring the descent of bodies (figure in text); discussing new observations of Saturn (figure in text) from a book sent to him with a letter from Rome

Reference number: EL/H1/36

Original letter no longer exists but was dated 31 October 1664 Discussing the rise and fall of mercury, and Slusius of Liege's thermometer; doubts Campani's tool for grinding lenses, and asks about the production of large lenses; expects a parcel of glass from his father, that the Parisians are impressed with his father's microscope, and that his father was impressed with Campani's telescope

Reference number: EL/H1/38

Original letter no longer exists but was dated 31 October 1664 Discussing the rise and fall of mercury, and Slusius of Liege's thermometer; doubts Campani's tool for grinding lenses, and asks about the production of large lenses; expects a parcel of glass from his father, that the Parisians are impressed with his father's microscope, and that his father was impressed with Campani's telescope

Reference number: EL/H1/39

Concerning Hooke's and Campani's methods of grinding lenses; discussing the universal measure, pendulum clocks (figure in text); Hooke's instrument for measuring the refractions of liquids and another instrument for measuring the descent of heavy bodies Read to the Royal Society on 23 November 1664

Reference number: EL/H1/40

Concerning Hooke's and Campani's methods for grinding lenses; discussing the universal measure, pendulum clocks (figure in text); Hooke's instrument for measuring the refractions of liquids and another instrument for measuring the descent of heavy bodies

Reference number: EL/H1/41
1665

Concerning a new instrument for grinding lenses; new vehicles for travel; concerning his universal measure; concerning a portable thermometer; concerns measuring the refractions of the sun; concerning Hooke's instrument for measuring the descent of falling bodies; observations of the comet Read to the Royal Society on 4 January 1665

Reference number: EL/H1/42

Concerning a new instrument for grinding lenses; new vehicles for travel; concerning his universal measure; concerning a portable thermometer; concerns measuring the refractions of the sun; concerning Hooke's instrument for measuring the descent of falling bodies; observations of the comet in 1664 (with figures)

Reference number: EL/H1/43

Observations of the comet and the equation of time; concerning Hooke's instrument for measuring the descent of falling bodies Read to the Royal Society on 14 January 1665

Reference number: EL/H1/44

Remarks on Captain Holmes' journal about watches and other notices

Reference number: EL/H1/45

Concerning observations of the comet by different people; concerning Monsieur de Son's new mode of transport Read to the Royal Society on 1 March 1665

Reference number: EL/H1/46

Discussing Hooke's experiments with fire and air; discussion of clocks

Reference number: EL/H1/47

Discussing an article about the hanging of clocks for use at sea; discussing the work of Hooke; observations of lighting brimstone with nitrate

Reference number: EL/H1/48

Concerning observations of clocks at sea; discussing the work of Hooke and of Boyle relating to the formation of colours; observations of a new comet

Reference number: EL/H1/49

States that he has received a thermometer; concerning instructions for determining longitude; concerning Hevelius's observations of the comet

Reference number: EL/H1/50

States that he has received a thermometer; concerning instructions for determining longitude; concerning Hevelius's observations of the comet

Reference number: EL/H1/51

Concerning the unprinted works of Vieta; application of spring-driven pendulum clocks; Hooke's method of creating long telescopes; Cassini's predictions of the eclipse of the satellites of Jupiter

Reference number: EL/H1/52

Concerning Hooke's springs for pendulum clocks; observations of the satellites of Jupiter and its permanent spot (figure in text)

Reference number: EL/H1/53

Concerning Hooke's springs for pendulum clocks; observations of the satellites of Jupiter and its permanent spot (figure in text)

Reference number: EL/H1/54
1666

Concerning his study to improve telescopic lenses; concerning a clock for use at sea

Reference number: EL/H1/55

Concerning his study to improve telescopic lenses; concerning a clock for use at sea

Reference number: EL/H1/56
1669

Concerning controversy with M Gregory; concerning Wren's and his own laws of motion; discussing the clock to discover longitude; discusses writing in code or anagrams for conveying future ideas

Reference number: EL/H1/59