1875s Brass Sextant Signed Negus New York Antique Marine Navigation Instrument

View Similar Items

Antique Cased Octant, Scottish, Ebony, Navigation Instrument, Sextant, Victorian

Yacht Binnacle by Negus of New York

1960s Nautical Rangefinder Signed Kelvin Hughes Antique Marine Navigation Tool

Vintage Rolling Rule English Brass Scientific Instrument, Navigation, circa 1950

Brass Binnacle "NEGUS N.Y."

1875s Granadine Stucco Model with an Arabic-style Frame & an Antique Photograph

1875s Pair of Handcrafted Stucco Models Featuring Granadine Arches

Two Day Marine Chronometer, John Bliss, New York

1875s Pair of Carved and Polychrome Wood Mmodels, Arab-Andalusian Style.

1875s Handcrafted Carved Wooden Model with an Inlaid Frame Arab-Andalusian Style

A poket sextant signed Stanley, London 1890.

Brass sextant signed H. Hughes & Son Ltd No. 32890 of the 1930s

About the Item

Brass sextant signed Negus New York, datable around 1875, finely manufactured instrument, complete with optics and housed in an elegant original square wood box with closing hooks and lock with brass key. Brass frame with engraved silver protractor scale recessed in the arch, with scale from, silver flap and vernier, wooden handle, 3 colored glasses for the fixed mirror and 4 for the mobile one, three telescopes, a microscope for reading the vernier, index and horizon mirror. State of conservation: excellent, complete with support base made of wood and custom-made brass. Box measures 27 x 26.5 h 12.7 cm – 10.6 x 10.45 x 5 inches Our gift box is free (look at the last picture). The brothers Thomas Stewart and John D. Negus were highly regarded nautical instrument makers and arguably the leading manufacturers in the United States during the second half of the 19th century. They moved to New York City in 1864 and formed their own navigation instrument company, "TS & JD Negus", in 1869. In 1886 the United States Navy conducted one-year sea trials testing 47 chronometers, of the twelve accepted , 8 belonged to the Negus brothers, after this resounding success The company continued under the trade name "Negus" as both a manufacturer and retailer of nautical instruments well into the 20th century. The sextant is an optical instrument used in astronomical navigation to measure the height of the stars above the horizon, in order to obtain the geographic coordinates relative to the ship's point. It has the shape of a circular sector of 60, i.e. one sixth of a circumference, hence the name, at whose vertex a mobile alidade is pivoted on which a mirror is fixed which rotates with it. On the back of the mirror there is a support with a telescope oriented towards a second mirror, only half silvered, which allows you to observe the marine horizon at the same time, in alignment, and the pointed star, whose image is reflected by the fixed mirror to the alidade and subsequently from the silver side of the mirror. Was Sir Isaac Newton who invented the principle of double reflection in navigation instruments, but this research was never published. Subsequently, two men independently discovered the sextant around 1730 John Hadley (1682 - 1744), English mathematician, and Thomas Godfrey, (1704 - 1749), American inventor. But it was only in 1758 that Admiral John Campbell carried out a series of tests in the open sea to experiment with a new method which relied on the lunar distance as a means of calculating longitude. This is how the sextant was developed. Initially produced in brass, they had scales divided with great precision by mathematicians who made scientific instruments.

Dimensions:
Height: 5 in (12.7 cm)Width: 10.45 in (26.55 cm)Depth: 10.6 in (26.93 cm)
Materials and Techniques:
Brass
Period:
1870-1879
Date of Manufacture:
1875
Condition:
Seller Location:
Milan, IT
Reference Number:
1stDibs: LU1020234231982

More From This Seller

View All

1960s Nautical Rangefinder Signed Kelvin Hughes Antique Marine Navigation Tool

Located in Milan, IT

Nautical rangefinder signed Made in Great Britan by Kelvin Hughes a divison of Smiths Industries Limited made in the 1960s, complete with original mahogany box. AP 498 Stuats Marine Distance Meter very good working condition. Box size cm 21 x 13 H 6. It is an ancient nautical instrument used to measure...

Category

Vintage 1960s British Nautical Objects

Materials

Metal

1960s Nautical Rangefinder Signed Kelvin Hughes Antique Marine Navigation Tool

$983

Brass sextant signed H. Hughes & Son Ltd No. 32890 of the 1930s

Located in Milan, IT

Brass sextant signed H. Hughes & Son Ltd No. 32890 of the 1930s; instrument complete with optics and housed in its original mahogany wood box of with locking hooks and brass handle,...

Category

Vintage 1930s Nautical Objects

Materials

Brass

Brass sextant signed H. Hughes & Son Ltd No. 32890 of the 1930s

$2,488

1893 Antique Lippich Brass Polarimeter Antique Physic Analysis Instrument

By Societé Genevoise

Located in Milan, IT

Lippich polarimeter, scientifi instrument made in 1893 signed Societé Genevoise Genève, brass and black metal. It is an optical instrument of analysis used to determine the concentra...

Category

Antique 1890s Swiss Scientific Instruments

Materials

Brass

1893 Antique Lippich Brass Polarimeter Antique Physic Analysis Instrument

$2,083

Brass sextant signed Imray & Son 89 & 102 Minories London mid-19th century

Located in Milan, IT

Brass sextant signed Imray & Son 89 & 102 Minories London, datable to around mid-19th century, instrument housed in its original mahogany box shaped like the instrument with hinges, ...

Category

Antique Mid-19th Century Nautical Objects

Materials

Brass

Brass sextant signed Imray & Son 89 & 102 Minories London mid-19th century

$3,414

England Early 1900 Brass Galvanometer Antique Physic Measuring Instrument

By Philip Harris Ltd.

Located in Milan, IT

Moving coil brass galvanometer with three-screw base, instrument signed Philip Harris Ltd Birmingham England n. 19402, made in the early 1900, a tool used as a detector of direct cur...

Category

Early 20th Century British Scientific Instruments

Materials

Brass

England Early 1900 Brass Galvanometer Antique Physic Measuring Instrument

$1,099

1870 Antique Burnished Brass W F Stanley Level Surveyor Measurement Instrument

Located in Milan, IT

Topographic level signed W.F Stanley of burnished brass, from the second half of the 19th century. In excellent condition and complete with original mahogany box with brass hinges an...

Category

Antique 1870s British Scientific Instruments

Materials

Brass

Detailed stucco models replicating the iconic three-window arches inspired by the architecture of the Alhambra in Granada. The piece features finely polychromed engravings with Arabi...

Category