Renseignements généraux

Nº de série

63945

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Brass, makrolon & glass sextant. mahagony wood case has foam padding; cw padded fabric cover & fabric cleaning cloth.

Dimensions

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

Longueur

31,0 cm

Largeur

31,0 cm

Hauteur

18,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Transports maritimes

Catégorie

Instruments et équipement de navigation

Sous-catégorie

S/O

Fabricant

Ou

PLATH

Pays

République fédérale d'Allemagne

État/province

Inconnu

Ville

Hambourg

Contexte

Pays

Worldwide

État/province

Inconnu

Période

This sextant never used. Sextant developed in 1757, with basic design & shape remaining constant.

Canada

This sextant was never used. Donated by Mr. G.C.E. Theriault of Victoria, B.C.

Fonction

Micrometer drum sextant used for measuring the angle between the horizon and a celestial body (sun, moon, stars, etc.) A series of reflecting mirrors was used to line up the reflection of the horizon and the body, and then a measurement was read and converted into longitude and latitude.

Technique

Sextant developed in 1757, and facilitated mariners' use of the method of lunars in navigating. Following development of Ramsden's dividing engine (1775), the high costs formerly associated with accurately dividing the sextant's scale were reduced, and the sextant became the standard instrument for measuring vertical and/or horizontal angles at sea. (ref. 1) This sextant was Plath's Navistar Model Sextant. It was designed for ease of use, extremely high durability and above average accuracy. The Navistar sextant was said to represent the finest state of art and technology of a traditional sextant. Arc goes from -5 degrees to 130 degrees.

Notes sur la région

Inconnu

Détails

Marques

" C. PLATH/ HAMBURG/ WEST GERMANY " & " NAVISTAR/ 63945 " incised on arc, with scale -5 degrees to 125 degrees, divided at intervals of 1 minute. Micrometer scale 0-59, reads to 0.2 minutes (12 seconds). " Weems & Plath " incised on index arm. Illustrations of instrument in various positions appear on foam packing lining lid.

Manque

None apparent Some holes in foam do not have parts

Fini

Sextant is predominantly black, with bright brass divided arc and selected fittings; glass lenses, filters, micrometer cover, etc./ medium brown mahogany stained wooden box has bright brass hinges & fittings; brown synthetic handle; green foam lining./ bright blue fabric cover lined with green nylon; Velcro closures.

Décoration

S/O