Renseignements généraux

Nº de série

65402

Nº de partie

1

Nombre total de parties

7

Ou

S/O

Brevets

S/O

Description générale

Frame & arm made from brass/glass lenses and mirrors/wooden handle and carrying case/plastic telescope/leather neck strap/frame& arm painted black/handle painted black/case stained brown and varnished.

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

34,1 cm

Largeur

30,5 cm

Hauteur

65,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Exploration et levé

Catégorie

Mesure-angle

Sous-catégorie

S/O

Fabricant

Ou

Kelvin Hughes

Pays

England

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Inconnu

État/province

Inconnu

Période

Inconnu

Canada

Acquired from the NRC in 1985.

Fonction

Vernier sextant; used by navigators to determine their position at sea. A series of reflecting mirrors are arranged so that a celestial body can be lined up with the horizon, and the longitude and latitude are measured.

Technique

Manufactured by Kelvin & Hughes Ltd. Arc goes from -5 degrees to 150 degrees, and vernier reads to 20 units. Sextants replaced older methods of measuring angles because more precision could be obtained due to the star being measured relative to the horizon, and not the instrument, which was used previously. Serial number 65402.

Notes sur la région

Inconnu

Détails

Marques

Mfr's trademark 'KH' superimposed over a red arrow appears on sliding arm of sextant./ 'MADE IN GREAT BRITAIN', 'KELVIN & HUGHES LTD.', 'SURVEY', and 'SER. NO. 65402' incised on top edge of rule/ Mfr's specifications label and cleaning instructions appear side lid: Off-white rectangular label, protected by plastic window, affixed inside lid of box. Two seated mermaids appear in upper right and left corners; rope-like motif surrounds text, interrupted by decorative seahorse figure on either side, at mid-point of border./ Text:: ‘KELVIN/ &/ HUGES/ LIMITED/ THE SEXTANT NO. 65402./ named Kelvin & Hughes Ltd./ of 6" radius & reading to 1'/ has been examined & found satisfactory/ The following corrections should be applied: –/ Angle 30 60 90 120 / Correction 0' 0' 0' 0'/ The shades and mirrors are satisfactory/ Telescope data: –/ magnification/ 5x/ Angle of Field of View/ 3.5 / Effective Aperture 1.75"/ The definition is satisfactory/ Date 1/11/57. Signed [illegible]'./ Label encased in plastic screwed to inside lower edge of lid bears the following info.: ‘IMPORTANT/ (1) Keep the bearing grooves at the edge of the arc/ lubricated sparingly at regular intervals with the/ special oil provided./ (2) The arc and micrometer teeth must be kept/ clean in order to prevent any stiffness developing/ in the index bar movement./ (3) Rub mirrors very lightly when cleaning, no pressure should be applied.'/ '6431', '65', and 'SEXTANT' handwritten on case./ BOX: Off-white rectangular label, protected by plastic window, affixed inside lid of box. Two seated mermaids appear in upper right and left corners; rope-like motif surrounds text, interrupted by decorative seahorse figure on either side, at mid-point of border. Text: ‘KELVIN/ &/ HUGES/ LIMITED/ THE SEXTANT NO. 65402./ named Kelvin & Hughes Ltd./ of 6" radius & reading to 1'/ has been examined & found satisfactory/ The following corrections should be applied: –/ Angle 30 60 90 120 / Correction 0' 0' 0' 0'/ The shades and mirrors are satisfactory/ Telescope data: –/ magnification/ 5x/ Angle of Field of View/ 3.5 / Effective Aperture 1.75"/ The definition is satisfactory/ Date 1/11/57. Signed [illegible]'./ Label encased in plastic screwed to inside lower edge of lid bears the following info.: ‘IMPORTANT/ (1) Keep the bearing grooves at the edge of the arc/ lubricated sparingly at regular intervals with the/ special oil provided./ (2) The arc and micrometer teeth must be kept/ clean in order to prevent any stiffness developing/ in the index bar movement./ (3) Rub mirrors very lightly when cleaning, no pressure should be applied.'

Manque

Unknown From CA of 08/11/1995 by Tony Missio: Undetermined

Fini

Inconnu

Décoration

S/O