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The Royal Society: Science in the Making

Correspondence Explorer

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Showing 7 letters from 1679–1682

4 letters from Robert Hooke; 3 letters from Henry Jacobs

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Outlines areas for further correspondence: determining longitude by keeping a record of the eclipses of the sun or moon; would like observations of the quicksilver weather glass in order to study changes in the weather in Lisbon; would like a map or description of Portugal

02 December 1679 Sender: Robert Hooke Reference number: EL/H3/58

Outlines areas for further correspondence: determining longitude by keeping a record of the eclipses of the sun or moon; would like observations of the quicksilver weather glass in order to study changes in the weather in Lisbon; would like a map or description of Portugal

01 January 1679 Sender: Robert Hooke Reference number: EL/H3/59
1680

Discussing Bond's theory of the inclinatory needle; concerns making a new map of Portugal; encloses a paper with observations of five lunar eclipses

27 December 1680 Sender: Henry Jacobs Reference number: EL/I1/152

Discussing Bond's theory of the inclinatory needle; concerns making a new map of Portugal; encloses a paper with observations of five lunar eclipses

27 December 1680 Sender: Henry Jacobs Reference number: EL/I1/153
1681

Hooke has collated observations of the eclipse (unclear whether it is of the sun or moon) by Flamsteed at Derby, by Bullialdus and Cassini at Paris, by Hevelius at Gdansk; asks for compass readings ('variation of the magnetic needle') at Lisbon; developments with determining longitude

10 October 1681 Sender: Robert Hooke Reference number: EL/H3/66
1682

Observations of the eclipse of the moon; wishes to determine the differences of the meridians of London and Lisbon

03 March 1682 Sender: Robert Hooke Reference number: EL/H3/67

Discussing observations of various eclipses in 1674 and in 1679; states that he will make observations of the variation of the compass at Lisbon but would like a new compass sent to him for this purpose; discussing sea navigation charts

08 January 1682 Sender: Henry Jacobs Reference number: EL/I1/155