Nautical Antiques & Marine Art at Land and Sea Collection™ Dive Helmets, Ship Models, Sextants

Large Hadley Style Three Mirror Backsight Octant Ca 1745

Home
U.S. Navy Shallow Water Miller-Dunn Style 3 Divinhood
About Us ~ Land And Sea Collection™
Distinguished CLIENTS & CORPORATIONS of Land And Sea Collection™
IMPORTANT RECENT SALES by Land And Sea Collection™
CONSIGN with or SELL to Land And Sea Collection™
STORE POLICIES at Land And Sea Collection™ ~ Terms of Sale
PAY HERE - View Cart - Shipping
SITE MAP & Index by Land And Sea Collection™
FEATURED ITEMS from Land And Sea Collection™
NAUTICAL ANTIQUES by Land And Sea Collection™
BIG BOYS' TOYS by Land And Sea Collection™
CLASSIC MOTORBOAT & SAILBOAT MODELS by Land And Sea Collection™
RARE MUSEUM OWNED SWORDS by Land And Sea Collection™
AMERICAN SILVER HILT SWORDS SABERS by Land And Sea Collection™
ANTIQUE AND VINTAGE BINNACLE, COMPASS, HELMS & TELEGRAPHS By Land And Sea Collection™
#Antique John Bliss Skylight Binnacle
ANTIQUE DRY CARD COMPASSES by Land And Sea Collection™
#Antique Robert Merrill Sons Boxed Dry Card Dinghy Compass
#Rare Antique Ritchie Twin Cylindrical Beam Boxed Ship's Compass
#NEGUS Polished Brass Tell Tale Compass Large
ANTIQUE FLINTLOCK & PERCUSSION PISTOLS by Land And Sea Collection™
ANTIQUE SCIENTIFIC INSTRUMENTS by Land And Sea Collection™
ANTIQUE SEXTANTS, OCTANTS & NAVIGATION INSTRUMENTS by Land And Sea Collection™
#C. Plath's Earliest Bronze Frame Sextant
#Troughton & Simms Double Frame Polished Brass Presentation Sextant
#Giant Antique Presentation Octant Gold Gilt Ca 1770
ANTIQUE MARITIME NAVAL SWORDS & CIVIL WAR WEAPONS by Land And Sea Collection™
#M 1852 Horstmann & Son Naval Officers Sword Ca 1860
#Colt M 1861 Navy Cap & Ball Revolver & Slim Jim Holster
#War of 1812 Officer's Eagle Head Sword & Scabbard Simon Helvig and Fils
ANTIQUE SHIPS MARINE NAVIGATION LIGHTS LAMPS & LANTERNS Land And Sea Collection™
#100 Year Old U.S. Navy Polished Brass Navigation Sidelights
AUTHENTIC ANTIQUE NAUTICAL FURNISHINGS & DECOR by Land And Sea Collection™
#American Schooner Yacht Shadowbox - Diorama Ca 1880
#44 Inch Carved American Eagle Artistic Carving Co.
Painting New York State Militia Officer
DIVING HELMETS ANTIQUE and VINTAGE by Land And Sea Collection™
#Poseidon Gold CYKLON Regulator & Presenation Case Mint
WE BUY OLD VINTAGE DIVING HELMETS Land And Sea Collection™
VINTAGE DIVE KNIVES, DIVE PUMPS & DIVE GEAR by Land And Sea Collection™
ANTIQUE VINTAGE SIGNAL SALUTE & SHIPS CANNONS by Land And Sea Collection™
#Royal Horse Artillery 6 Pound Miniature Sterling Presentation Field Cannon
#Revolutionary War 6 Pound Field Signal Cannon Miniature
AUTHENTIC SHIPS FIGUREHEADS at Land And Sea Collection™
ANTIQUE & VINTAGE BOAT & SHIP MODELS by Land And Sea Collection™
#Fine Handcrafted Famous American Clipper Ship Cased Model
#Antique Diorama of Sailing Ship ALBUS Michael Gregory Captain
#Four Masted Bark Vintage Sailor-made Model Massive Ca 1920
VINTAGE RADIO CONTROL MODELS by Land And Sea Collection™
UNDERSTANDING HALF HULL MODELS by Land And Sea Collection™
ANTIQUE BUILDER'S HALF HULL MODELS Page Two by Land And Sea Collection™
#Royal Yacht Squadron Tatania Half Model Ca 1850
#Large American Pilot Boat Half Model Ca 1860
ANTIQUE AND VINTAGE HALF HULL BOAT MODELS by Land And Sea Collection™
#NOAA Tank Test Submarine Support Ship Half Hull Model
MINIATURE VINTAGE MODEL SHIPS by Land And Sea Collection™
MILITARY, NAVAL KNIVES, DAGGERS, DIRKS by Land And Sea Collection™
CIVIL WAR & WARD LINES SHIP CAPTAIN'S ARCHIVE by Land And Sea Collection™
US NAVY - ROYAL NAVY ARTIFACTS & RELICS by Land And Sea Collection™
#Blueprint Sloop of War USS Wasp Ca 1806
#Early China Export Trade Silver Bosun's Pipe - Call
#Watercolor Painting of HMS Victory 1737
#Watercolor Painting of Royal Navy 38 Gun Frigate Class of 1793 Signed
Battleship USS North Carolina BB 55 Vintage Model
AUTHENTIC ROYAL NAVY UNIFORMS and MEDALS by Land And Sea Collection™
VINTAGE AIRPLANE MODELS by Land And Sea Collection™
#JUNKERS JU 52 "Iron Annie" Airplane Model Larger Size
NEW SEXTANTS - ASTRA III B DELUXE by Land And Sea Collection™
USED SEXTANTS PREMIUM BRANDS by Land And Sea Collection™
#Presenation Quality 3 Ring Sextant Capt. P.V.H. Weems Provenance
#Latest C. Plath "Traditional" Model Sextant Mint
FINE MARINE ART, MARINE PAINTINGS & FOLK ART by Land And Sea Collection™
#A Trio of Sailors at the Ship's Rail Oil on Canvas
#GRAND TURK of Salem, 1815 Watercolor Painting as in Peabody Museum
#Royal Navy Midshipman in the Rigging - Watercolor Ca 1785
#Antique John Bellamy Style Carved American Eagle
Artistic Carving Co. American Eagle
#Ward Line Ship Portrait USS NIAGARA Fredrick S. Cozzens Original Watercolor 1888
#Antique Shipbuilder's Colored Advertising Ship Drawing
MILITARY HEAD GEAR COVERS & HATS by Land And Sea Collection™
AUTHENTIC VINTAGE U.S. NAVY & SHIPS BELLS by Land And Sea Collection™
What There Is To Know About US Navy Bells
#US Vietnam Era Navy Bell & Later Aluminum Bracket
RADIO ROOM CLOCKS - by Land And Sea Collection™
VINTAGE NAVY & MARITIME SHIPS CLOCKS by Land And Sea Collection™, Chelsea, Seth Thomas
#Hamilton 22 Gimbaled Deck Clock & Case
#Seth Thomas WW II US Navy Deck Clock No. 1
#Vintage Chelsea Ship's Bell Clock Hinged Bezel 5 Stars
SHIPS LIGHTING LANTERNS NAVIGATION LAMPS BRASS by Land And Sea Collection™
Perkins Marine Combination Navigation Lamp
ABOUT OUR MODELS by Land And Sea Collection™
HALF HULL MODELS by Land And Sea Collection™
CONTEMPORARY NAUTICAL ART, MARINE PAINTINGS OF CLASSIC SEASCAPES by Land And Sea Collection™
WOOLWORKS BRITISH WOOLIES by Land And Sea Collection™
#Woolie of Sail Assisted Four Masted British Steamship Sailor Made Wool Work
ARCHIVES of Land And Sea Collection™ raytest
LINKS

Large Hadley Style Three Mirror Backsight Octant Ca 1745

 

THREE MIRROR BACK SIGHT
EARLY HADLEY STYLE OCTANT
Ca 1745 - 1755

Early backsight octannt image
 
 

Presented is a very large octant with Mahogany frame and an index arm of 16 inches long that has an unnamed cross bar.  It is the same design, and only one inch smaller than Hadley's “double reflecting principal” octant which was submitted to the Royal Society in London in 1731. Shortly thereafter, Hadley began selling octants with a vertical dimension of 17 inches compared to this instruments 16 inches. We can conclude that this example is one of the first to adopt the Double Reflecting principal in its design. The carefully incised scribing of the numbers on the arc show they were done by hand. The clamp that releases the index arm, predates the use of a tangent screw which was introduced in the 1820's. Mahogany was used before the change to ebony which also indicates its age. A unique feature of this instrument, which we have not seen before, is the raised platform upon which two horizon mirrors and the shades are mounted.

 
Hadley style octant in case image
                                               Hadley style octant Housed in a keystone, stair step case of the period



It has the characteristics of a very early octant consisting of: 

  • An early style Mahogany frame

    • Three mirrors

      • Two peep sights

        • Cross member on frame

          • pencil holder receptical (missing) and ivory tab on back

            • Flat wood index arm 16 inches or longer

              • Graduated arc from - 5 degrees to + 100 degrees

                • Vernier reading from right to left, 0 to 20 minutes 

                  • Precisely machined bronze fittings

                    • Single set of three movable shades (filters)

 

The three shade glass assembly is movable for placement at either the index mirror position or below at the secondary position where the third mirror allows for the taking of "back sights".

The large size numerals on the arc and their minor variations indicate they were done by hand and not by an "Index Machine" This suggests it was made by a superior instrument maker, standing at the top of his trade. In our opinion, it is the equal in quality of any instrument of this early period.

MARKINGS: The cross member has no maker's name nor is there a maker's mark on the ivory arc. Inside the case on the left top in large script is, "Daniel". On the left inside top are various mathematical calculations which are seemingly meaningless. They do not represent the steps to figure Local Apparent Noon.                  

Index
     Index mirror, peep sight and three shade glasses 

 

    The unique platform upon which the shades and twin horizon mirrors are mounted

   
 
The vernier of the large Hadley style octant image
    The octant's vernier scale reading right to left in 0 to 20 arc minutes, Note the verdigris and the finger clamp 

 

Hadley style octant's back sight mirror image
The degraded backsight mirror
   
 

The brass fittings are precisely machined, which make this instrument a work of manufacturing excellence for this early a period.
 

DIMENSIONS: 

  • Arc reads - 5 to +95 degrees

  • Length of index arm 16" long

  • Width of frame at arc 13 1/2 " wide

  • Index mirror 48 x 30 mm

  • Horizon mirror - 24 x 21 mm

  • Back sight mirror - 24 x 21 mm

  • Three movable shade glasses

  • Two Peep sights

  • Weight 2 Lbs 11 oz octant and case each. Total  5 lbs. 6 oz
     

DATING THE INSTRUMENT: The arc measures from minus 5 to 95 degrees on the scale. It is inlaid in the mahogany frame which is in excellent condition. It is known that mahogany went out of use in favor of Ebony some time after 1750.  The octant has a flat mahogany index arm measuring 16 inches long with a finger clamp. Tangent screws began replacing finger clamps in the last quarter  of the 18th Century. The horizon mirror is mounted on an adjustable turntable. Its base can be rotated by loosening a screw which locks the mirror's position. A third mirror is below it for taking back sights and is also adjustable. The ivory vernier scale reads from right to left from 20 to 0 arc minutes, a two hole peep sight, and movable three sun shades which serve both mirrors on the frame. 

All of these features date the instrument to likely Ca 1774 -1775. Some time after 1780, the index arm clamp was superseded by an adjustable tangent screw, which also helps date this octant. 

Ref. Peter Ifland's comprehensive sextant work, "Taking the Stars". particularly figure 64, page 57.
 

Closed
    Closed keystone case with stair step image of the Period

 

Back of Hadley style octant image
   The back of the Hadley style octant. Two legs are missing
 

CONDITION: The instrument is in good condition except for some minor faults.  On the back, some of the machinery has a deep patina of age and some doesn't. The graduated arc is excellent, and all the hardware is present. Missing are all three bronze legs. It has a keystoneivory pad on back, but the original small ivory scribe is missing. The index and primary mirrors are in very good condition considering their age. The backsight mirror has lost most of its silvering. There are two spots of green verdigris on the vernier around the pins holding the scale.

The Case is  the typical stair step, keystone design, of this period.  It has been with the octant for a long time, but the carved out section at the lower right front may indicate it is not the original. There is a missing piece of wood at the bottom of the left front and some  scratches and wear marks, all around, but it is strong and sturdy. With the index arm set to the far right, the octant fits as it should. There is no lock, but there a period hook to hold it closed. 


All in all, a rare, desirable, and special example of an early Hadley style octant by England's early largest instrument maker.

OUR QUALIFICATIONS: We are one of the few company's still selling navigation instruments that know anything about them. For purposes of judging whether Joel's opinion counts, he was the editor of the chapter on sextants of the 1977 Edition of "Bowditch", The American Practical Navigator, NAVPUB 9; a member of the U.S. Naval Academy Navigation Syscratchesoard, 1975 -1978; the author of a book on marine sextants, Cornell Maritime Press,1975, and the founding president of Nautech Maritime Corporation which partnered with Tamayr in the introduction of the MS 733 Spica, the MS 833, Jupiter, MS 933 Venus sextants and the famous NC-2 navigation computer, in the U.S. market. Joel is also a retired Master Mariner, and held a U.S. Navy "D" Qualification as a Senior Skipper - Oceans. From 1995 through 2000, he served as a Varsity Offshore Sailing Team coach at the U.S. Naval Academy.

OUR UNCONDITIONAL NO NONSENSE GUARANTEE: If not completely satisfied with your purchase it may be returned, if without damage, within three days of receipt in its original packaging. Return items must be insured for their full value. Only a prior email authorization by us for the return is required. Shipping charges are  included in this offer if the error is due to our fault.  

International buyers welcome, but inquire first. We have satisfied customers in Argentina, Australia, Austria, Belgium, Bermuda, British Virgin Islands, Canada, Chile, Republic of China, Czech Republic, Democratic Republic of Congo, Denmark, Estonia, England, France, Germany, Greece, Holland, Hong Kong, Hungary, Iceland, Indonesia, Ireland, Israel, Italy, Japan, Kuwait, Latvia, Luxembourg, Malaysia, Martinique, Mexico, New Hebrides (Vanuatu), New Zealand, Nigeria, Norway, Nova Scotia, Panama, Philippines, Poland, Portugal, Puerto Rico, Romania, Russia, Saudi Arabia, Scotland, Singapore, South Africa, Spain, St. Maarten, Sweden, Switzerland, Thailand, Turkey, United Arab Emirates, USVI, Vanuatu (New Hebrides) and the Eastern Caribbean.

STANDARD FORMS OF PAYMENT are Bank wire transfer, cashier's check, money order, or personal check in which case the item will be held until cleared. Our prices are quoted net to us so that the use of credit cards or PayPal for lesser value items incur extra charges. Terms on overseas sales may be different. 

This is a very special early Hadley style octant! It is a perfect find for your collection or a special gift.

Copyright 2016 by Land And Sea Collection™, All Rights Reserved