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Christiaan Huygens
Robert Moray
Concerning some observations of Saturn Read to the Royal Society on 9 October 1661
24 June 1661 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/1
Concerning Boyle's astronomical observations
15 July 1661 Sender: Christiaan Huygens , Christiaan Huygens 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
01 August 1661 Sender: Christiaan Huygens , Christiaan Huygens 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
16 September 1661 Sender: Christiaan Huygens , Christiaan Huygens 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
04 November 1661 Sender: Christiaan Huygens , Christiaan Huygens 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
30 December 1661 Sender: Christiaan Huygens , Christiaan Huygens 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
04 January 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
03 February 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
10 February 1662 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/9
Application of the cycloid to the pendulum clock; finding the weight of air
24 February 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
14 July 1662 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/11
Concerning the descent of bodies through the air and the Huygenian tables of equation
Sender: Christiaan Huygens , Christiaan Huygens 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
09 June 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
18 August 1662 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/14
Concerning Hobbes's experiments for freeing water from air Read to the Royal Society on 31 December 1662
01 December 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1662 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/16
Sends two of his clocks for longitude for consideration by the Royal Society, and sends other books
20 December 1662 Sender: Christiaan Huygens , Christiaan Huygens 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
02 February 1663 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1663 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/19
Gives congratulations on the establishment of the Royal Society
01 June 1663 Sender: Christiaan Huygens , Christiaan Huygens 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')
11 November 1663 Sender: Christiaan Huygens , Christiaan Huygens 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
18 November 1663 Sender: Christiaan Huygens , Christiaan Huygens 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
09 December 1663 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/24
Concerning Huygens' clocks for determining longitude; observations of experiments with mercury in a tube
19 December 1663 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
20 February 1664 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/27
Concerning a new mode of transport in Paris; concerning experiments showing the height of mercury in a tube
12 March 1664 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/28
Notices about the dissolution of the Academy of Montmer and other matters
12 June 1664 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/30
Concerning several literary notices
27 June 1664 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/31
Concerning the compression of air; discussing the measurement of falling bodies; discussing his new clock
18 July 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
08 August 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
29 August 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
21 November 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
01 January 1664 Sender: Christiaan Huygens , Christiaan Huygens 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
02 January 1665 Sender: Christiaan Huygens , Christiaan Huygens 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)
01 January 1665 Sender: Christiaan Huygens , Christiaan Huygens 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
16 January 1665 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/44
Remarks on Captain Holmes' journal about watches and other notices
06 February 1665 Sender: Christiaan Huygens , Christiaan Huygens 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
27 February 1665 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/46
Discussing Hooke's experiments with fire and air; discussion of clocks
06 March 1665 Sender: Christiaan Huygens , Christiaan Huygens 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
27 March 1665 Sender: Christiaan Huygens , Christiaan Huygens 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
10 April 1665 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/49
States that he has received a thermometer; concerning instructions for determining longitude; concerning Hevelius's observations of the comet
29 May 1665 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/50
States that he has received a thermometer; concerning instructions for determining longitude; concerning Hevelius's observations of the comet
01 January 1665 Sender: Christiaan Huygens , Christiaan Huygens 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
18 September 1665 Sender: Christiaan Huygens , Christiaan Huygens 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)
24 December 1665 Sender: Christiaan Huygens , Christiaan Huygens 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)
01 January 1665 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/54
1666
Concerning his study to improve telescopic lenses; concerning a clock for use at sea
09 April 1666 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/55
Concerning his study to improve telescopic lenses; concerning a clock for use at sea
01 January 1666 Sender: Christiaan Huygens , Christiaan Huygens Reference number: EL/H1/56
1669
