De gemmis in genere, c 1670-c 1680
Scope and Contents
Notes, mostly from Berquen, Boethius, Tavernier and Boyle. Index of refraction in diamonds is given 41/100 on the authority of Halley. On p.3 is mentioned a very fragile and soft western Topaz which he found to have a specific gravity 4.27, though the sines of refraction were as 14 to 23 (could this be Baryte?). On p.7 he deduces from the cleavage that gems are crystallized like salts from juices which turn to stone. At the end are the gold and silver standards of different countries.
Dates
- Creation: c 1670-c 1680
Creator
Conditions Governing Access
Due to the fragile nature of the material access to the collection is restricted. It is available to view in the Cambridge University Digital Library at https://cudl.lib.cam.ac.uk/collections/newton/1 with the exception of MS.Add.4007, which is open for consultation by holders of a Reader's Ticket valid for the Manuscripts Reading Room.
Extent
12 folio(s) (ff.12 [quarto] paper) : paper
Language of Materials
English
Repository Details
Part of the Cambridge University Library Repository
Cambridge University Library
West Road
Cambridge CB3 9DR United Kingdom
Map Dept enquiries: maps@lib.cam.ac.uk
all other enquiries: mss@lib.cam.ac.uk