Sestante in ottone H.G. Blair & Co 53, James St. Cardiff seconda metà XIX secolo

View Similar Items

Torricellian barometer French manufacture from the second half of the 19th century

Leiden bottle from the second half of the 19th century holds electrical charges

Leiden bottle second half of the 19th century accumulates preserves electrical charges

Johannes Nepomuk bohemian 1st half of the 19th century

Model with Nasrid Plasterwork Motif from Granada Second Half of the 19th Century

Fassamano French Tortoise antique Eyeglasses second half 19th Century

Antique icon Zosima and Swataj, second half 19th century

Fassamano French Tortoise Antique Eyeglasses Second Half 19th Century

Metronome system Paquet 1815 and Johan Maelzel 1846 second half of the 19th century

Immaculate Conception Chapel, Second Half of the 18th Century

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

Reredos Fragment, Gilded Wood, circa Second Half of the 17th Century

Want more images or videos?

Request additional images or videos from the seller

1 of 21

Sestante in ottone H.G. Blair & Co 53, James St. Cardiff seconda metà XIX secolo

About the Item

Sestante in ottone firmato H.G. Blair & Co 53, James St. Cardiff, della seconda metà del XIX secolo e alloggiato nella sua scatola originale in legno di mogano con maniglia, cerniere e ganci di chiusura in ottone, completa di serratura con chiave . Lembo e verniero in argento, impugnatura in legno, 3 vetri colorati per lo specchio fisso e 4 per quello mobile, tre telescopi, 1 filtro, 1 chiave per la registrazione, verniero graduato da 0 a 150°, specchio d’indice e d’orizzonte. Stato conservazione: molto buono, funzionante e completo di base per l’appoggio realizzata in legno e ottone su misura. Misura scatola cm 25,5x23x13 – inches 10x9.1x5.2. L'ultima foto è la confezione regalo. Blair & Co venne fondata a Bristol nel 1829 da John Blair, l’azienda rimase a Bristol fino a quando il proprietario decise di trasferirsi a Cardiff per ampliare il commercio nel Galles del Sud. Nel 1926 uno sciopero generale paralizzò tutte le spedizioni e Blair fu costretto a cedere l’azienda ad un consorzio di armatori locali. Nel 1927 l’azienda cambiò nome diventando Blairs Nautical Supplies. La dattilografa Nellie Ramsay insieme alla sorella Mabel entrarono in azienda nel 1908, arrivando a diventarne le proprietarie e ritirandosi dall’attività nel 1970. Il sestante è un antico strumento astronomico utilizzato per la misurazione dell’altezza di un astro (per esempio del Sole): si dispone lo strumento in un piano verticale e, guardando attraverso il dispositivo di mira, si traguarda la linea dell’orizzonte visibile attraverso la metà non argentata dello specchio fisso. Muovendo l’alidada, con la quale è solidale lo specchio, si fa in modo che i raggi luminosi provenienti dall’astro e successivamente riflessi dallo specchio mobile e dalla metà argentata dello specchio fisso vengano da quest’ultimo rinviati nella direzione di osservazione: se si guarda attraverso il dispositivo di mira si vede l’immagine dell’astro, ottenuta per doppia riflessione, coincidere con la linea dell’orizzonte. L’altezza dell’astro è espressa dall’angolo il cui valore viene letto sulla scala graduata. Il filtro viene utilizzato quando l’astro da traguardare è il Sole. Fu Sir Isaac Newton l'inventore del principi della doppia riflessione negli strumenti di navigazione, ma queste ricerche non furono mai pubblicate. Successivamente, due uomini, indipendentemente l'uno dall'altro, scoprirono il sestante attorno al 1730 : John Hadley (1682-1744), matematico inglese, e Thomas Godfrey, (1704-1749), inventore americano. Ma solo nel 1758 l’ammiraglio John Campbell effettuò in mare aperto una serie di prove per sperimentare un nuovo metodo che si basava sulla distanza lunare come mezzo per calcolare la longitudine. Fu così che venne messo a punto il sestante. Inizialmente prodotti in ottone, avevano scale divise con grande precisione dai matematici che fabbricavano strumenti scientifici.

Dimensions:
Height: 5.2 in (13.21 cm)Width: 9.1 in (23.12 cm)Depth: 10.9 in (27.69 cm)
Materials and Techniques:
Brass
Period:
1870-1879
Date of Manufacture:
1870
Condition:
Wear consistent with age and use.
Seller Location:
Milan, IT
Reference Number:
1stDibs: LU1020243587682

More From This Seller

View All

Torricellian barometer French manufacture from the second half of the 19th century

Located in Milan, IT

Torricellian mercury barometer, French manufacture from the second half of the 19th century, made of mahogany veneer wood with cedar wood edge threading complete with rare thermomet...

Category

Antique 1870s Scientific Instruments

Materials

Wood

Torricellian barometer French manufacture from the second half of the 19th century

$2,261

Leiden bottle from the second half of the 19th century holds electrical charges

Located in Milan, IT

Leiden bottle from the second half of the 19th century, this is an electrical component that accumulates and stores a high-voltage electrical charge by means of an external source ...

Category

Antique 1880s Scientific Instruments

Materials

Glass

Leiden bottle from the second half of the 19th century holds electrical charges

$463

Leiden bottle second half of the 19th century accumulates preserves electrical charges

Located in Milan, IT

Leiden bottle from the second half of the 19th century is about an electrical component that accumulates and stores a high-voltage electrical charge by means of an external source ...

Category

Antique 1880s Scientific Instruments

Materials

Glass

Leiden bottle second half of the 19th century accumulates preserves electrical charges

$463

Fassamano French Tortoise antique Eyeglasses second half 19th Century

Located in Milan, IT

Fassamano (from the French face-a-main) eyeglasses with handle that turns into a case shaped like the lenses; dark tortoise eyeglasses, oval lenses...

Category

Antique 1860s French Scientific Instruments

Materials

Bakelite

Fassamano French Tortoise antique Eyeglasses second half 19th Century

$637

Fassamano French Tortoise Antique Eyeglasses Second Half 19th Century

Located in Milan, IT

Fassamano (from the French face-a-main) eyeglasses with handle that turns into a case shaped like the lenses; dark tortoise eyeglasses, oval lenses...

Category

Antique 1860s French Scientific Instruments

Materials

Bakelite

Fassamano French Tortoise Antique Eyeglasses Second Half 19th Century

$463

Metronome system Paquet 1815 and Johan Maelzel 1846 second half of the 19th century

Located in Milan, IT

Metronome system Paquet 1815 and Johan Maelzel 1846 from the second half of the 19th century. This is an instrument used to measure the tempo of music; the sound of the pendulum accu...

Category

Antique 1870s Musical Instruments

Materials

Wood

Metronome system Paquet 1815 and Johan Maelzel 1846 second half of the 19th century

$1,391

Antique Mid-19th Century Czech Bohemian Religious Items

Materials

Wood

Johannes Nepomuk bohemian 1st half of the 19th century

$1,200

Model with Nasrid Plasterwork Motif from Granada Second Half of the 19th Century

Located in Marbella, ES

Mould with Nasrid plasterwork motif. Granada, second half of the 19th century. Plaster. It has slight flaws on the edges. Measurements: 28 x 41 x 2 m. Following the Mudéjar tradition of working plaster as a decorative material, this plaster mould...

Category

Antique 19th Century Spanish Architectural Models

Materials

Plaster

Model with Nasrid Plasterwork Motif from Granada Second Half of the 19th Century

$2,203

Antique icon Zosima and Swataj, second half 19th century

Located in Gorssel, GE

Zosima and Swataj, founders of the Solowetski Monastery, holding a model of their monastery in their hands, Old Believers icon, second half 19th century. Dimensions: 30 x 35 cm.

Category

Antique 19th Century Russian Religious Items

Materials

Wood

Antique icon Zosima and Swataj, second half 19th century

$3,769

Immaculate Conception Chapel, Second Half of the 18th Century

Located in Madrid, ES

Sculpture, carved wood, glass, metal. Carved wooden chapel with decoration on the top of balustrade and balusters in the shape of a vase of a certain Baroque memory, which presents t...

Category

Antique 18th Century Spanish Neoclassical Religious Items

Materials

Metal, Other

Immaculate Conception Chapel, Second Half of the 18th Century

$927

Reredos Fragment, Gilded Wood, circa Second Half of the 17th Century

Located in Madrid, ES

Altarpiece. Wood carved and gilded. Baroque, towards the second half of the 17th century. The Solomonic column was an element already known in the Renaissance (and before) that was popularized in art, in large part, thanks to the Baldachin of St. Peter's Basilica of the Vatican by Gian Lorenzo Bernini (1624-1633), where he presented branches. In Spain, this type can already be seen in the Silver Tabernacle of the Cathedral of Seville (Juan de Alfaro, 15931596), used in altarpieces from the 1620s; nevertheless, the apogee of the Solomonic column will come from the hand of José Benito de Churriguera, whose altarpieces have an extraordinary importance since the second half of the 17th century and already at the beginning of the 18th century (note similarities and differences between the present altarpiece and that of the Convent of San Esteban...

Category

Antique 17th Century European Baroque Religious Items

Materials

Wood

Reredos Fragment, Gilded Wood, circa Second Half of the 17th Century

$13,916

Bronze Mortar, Tuscany, Second Half of 16th Century

Located in Bruxelles, BE

Bronze mortar with garlands, flowers and putti - Tuscany , second half of 17th century. Measures: height 10 diameter : 13 cm Artisans and healers used mortars for grinding food...

Category