Ebony and brass sextant.

Made:: 1862-1868 in Hatton Garden

maker:: Casella, L. P.

Ebony framed sextant with polished brass limb, brass index arm

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Ebony framed sextant with polished brass limb, brass index arm
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Ebony framed sextant with polished brass limb, brass index arm, wooden handle and inlaid ivory plate in the crossbar in keystone shaped wooden case, by Louis Paschal Casella, London, England,1862-1868. Consists of ivory inlaid scale 121° (-5° to 140°), 20’ divisions with ivory vernier, pivoted magnifier, , tangent and clamping screw to the rear of the index arm and four filter shades (three red, one green). Fitted with threaded telescope and telescope (93 mm) erect image, telescope (185 mm) inverted image and sight tube (83 mm). Carries label for Agostinho de Souza Reves E Cia, Rua d' Alfandega, No. 30, Rio de Janeiro, Brazil. Case marked inside lid with trade card of E.M. Rocha and Comp, 56 rua da Assemblea, Rio de Janeiro.

Wooden framed sextant by Cassela, London, in fitted wooden case. 19th Century

Details

Category:: Navigation

Object Number:: 1938-260

Materials:: ivory, brass (copper, zinc alloy) and ebony (wood)

type:: sextant

credit:: Hill, W.

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Parts

Ebony framed sextant

Ebony framed sextant with polished brass limb, brass index arm, wooden handle and inlaid ivory plate by Louis Paschal Casella, London, England,1862-1868. Consists of ivory inlaid scale 121° (-5° to 140°), 20’ divisions with ivory vernier, pivoted magnifier, tangent and clamping screw to the rear of the index arm and four filter shades (three red, one green). Fitted with threaded telescope and telescope (93 mm) erect image, telescope (185 mm) inverted image and sight tube (83 mm). Carries label for Agostinho de Souza Reves E Cia, Rua d' Alfandega, No. 30, Rio de Janeiro, Brazil.

Wooden framed sextant by Cassela, London, in fitted wooden case. 19th Century

Measurements:: overall: 255 mm x 245 mm x 110 mm, 1.365kg

Materials:: wood (unidentified) , ivory , ebony , brass (copper, zinc alloy) , glass and mirror-glass (silvered)

Object Number:: 1938-260/1

type:: sextant

Fitted keystone box for sextant by Casella

Fitted keystone box for sextant by Casella. Contains two eyepieces, and in the lid a trade label for E.M. Rocha and Comp, 56 rua da Assemblea, Rio de Janeiro, instrument makers, founded in 1898.

Wooden framed sextant by Cassela, London, in fitted wooden case. 19th Century