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Description: | Fait par Tho: Tuttell Ingenieur de sa MAIESTE BRITTANIQUE / pur les Instruments Mathematiques � LONDRES
Thomas Tuttell Charing X Londini fecit
An ivory staff and four decoratively engraved ivory vanes. The sky-end of the staff is pyramid-shaped. The vanes are in two parts and are held together by brass pins. The fourth vane has a fixed ivory horizon. The beginnings of the scales on all four sides are marked ?Altitude?, and ?Complement? for the zenith distance.
The scales are from 90� to 34� (side one); from 90� to 20� (side two); from 90� to 10� (side three) and from 90� to 4� (side four), this is vice versa for the zenith distance. The maximum reading accuracy is 10 arcminutes for the sides one to three, and 5 arcminutes for side four.
Signed on side one: ?Thomas Tuttell Charing + Londini fecit?
Signed on side two: ?Fait par Tho: Tuttell Ingenieur de sa MAIEST� BRITANIQUE | pour les Instruments Mathemathiques � LONDRES?.
Cross-staves were normally made of wood and few have survived. The cross staff was probably not meant for use on board a ship. It was part of a presentation set including a backstaff (NAV0040), two Gunter?s scales (NAV0108 and NAV0107), and a sector (NAV0166), all fitting in a lyre case. The inscription may point towards an original French owner.
Part of presentation set fitted into a lyre case. See NAV 0040 (S.118), NAV 0107 (CI/GS.1) NAV 0108 (CI/GS.2) (NAV0567 (DI.69) missing since before 1963).
Case is in FHB 715 CPD 11 C
caption: Cross-staff and vanes
caption: Large vane
caption: Small vane
caption: Medium vane
caption: Square vane - front
caption: Square vane - back
caption: Inscription - Thomas Tuttell
caption: Inscription - Majest� Britanique pour les Instruments Mathemathiques � Londres
caption: Cross-staff by Thomas Tuttell of Charing Cross | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Instruments of Navigation cross staffs Thomas Cross-staff The Old Royal Observatory Greenwich Tuttell Treasures of the National Maritime Museum | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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