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Antique Spencer Barrett Sextant 19TH Cent Henry Glover Label

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This Fine Instrument Has Been Sold. Thank you!
 
LARGE SPENCER BARRETT SEXTANT 19TH Cent 
Henry Glover, New York label

 
Presented is an ebony frame, ivory arc, antique sextant made by the quality maker Spencer Barrett & Co. of London. It is Ca 1850 - 1870. The instrument is in sound condition with well made metal machinery, and Spencer Barrett's signature sharply engraved ivory. It is housed in a keystone case which is in good condition considering its age. The arc measures from - 3 to plus 105 degrees. The ivory plate on a cross bar between the two limbs is engraved "Spencer Barrett & Co. London".
 
The label is that of Henry Glover who was active in New York as a chronometer and instrument maker in many locations there until 1872. He is listed in Webster's database of instrument makers.  It was priced at $18.00.
 

There are many examples of Spencer Barrett instruments in museums, and they are listed in Webster's Database of Instrument Makers, but little is known of their history other than they were active between about 1830 - 1880. A similar example of this instrument in the Smithsonian Museum. See http://americanhistory.si.edu/collections/navigation/object.cfm?recordnumber=1197564
Spencer Barrett was in business in London from about 1830 to 1880, specializing in instruments for navigational use. There is no connection between them and the more prolific Spencer Browning & Rust Co. which ceased business in 1870.
This well made instrument has a ribbed brass index arm measuring over 12 3/4" long with a diameter of arc of 10 1/2". The horizon mirror is on an adjustable turntable. There are three rectangular sun shades and a single circular horizon shade. This sets this instrument apart from others which were only fitted sun shades. Note the early form ivory vernier scale, reading from right to left from 0 to 20 arc seconds, two hole peep sight with "flap", and three sun shades all of which date the instrument. Its larger size and lack of  a handle on this instrument mark it as a transitional piece between an octant and a sextant.

Some time after 1780, the addition of a tangent screw, as fitted to this instrument, allowed for fine adjustment and represents one of the two major changes in the basic operation of the octants and sextants for the next 150 years! The second was the fitting of telescopes. As was the practice with octant's of larger size, this sextant was not fitted with a handle which indicates it is one of the earliest of that type made by this maker.

INSTRUMENT CONDITION: The index mirror is degraded around the edge, but has a good center reflective surface. The horizon mirror is in good condition. All the ivory is in perfect condition, and the engraving is sharp and distinct. Missing is a small ivory pencil which is typical and may never have been present. The index arm clamp, and shade glasses are complete and in good working order. One spring clip on the tangent clamp is broken off. This is insignificant. The ebony frame is without cracks. The instrument has its original machinery, and a two hole peep sight. Everything is original and in good working order. There is green verdigris over much of the brass indicating its years at sea.

THE CASE & LABEL: The "keystone" solid Mahogany case is in good solid condition. It is very clean inside with a small hole, and the lower right hand corner has been replaced. There is a lock, but no key. The label is that of Henry Glover who was active in New York as a chronometer and instrument maker in many locations there until 1872. He is listed in Webster's database of instrument makers.
                          Maker's Name
                            Vernier scale

              Peep sight and horizon mirror
                   Machinery and index mirror

All in all, a highly desirable and worthwhile example from one of the higher quality English instrument makers
 
DIMENSIONS:
 
Length of frame 12 3/4"
Width of frame at arc 10 1/2"
Index mirror 45 x 30 mm
Horizon mirror 24 x 20 mm
Weight 2 Lbs 2 oz
 
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 Symposium Board, 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 Tamaya of Japan 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 a retired Master Mariner, and held a U.S. Navy "D" Qualification as a Senior Skipper - Oceans. For six years he was a Varsity Offshore Sailing Team Coach at the U.S. Naval Academy. 
 
Some of his memberships include the: Association of Naval Aviation, Silver Wings, The Tailhook Association, Naval Academy Sailing Squadron, McCampbell's Aces Squadron, Naval Historical Foundation, and the Naval Order of the United States. 
Rarely do you find an instrument that is that is 166 years old in this original condition with a perfect case. A superior addition to any collection
OUR UNCONDITIONAL 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. A prior email authorization by us for the return is required. Unfortunately, shipping charges are not included in this offer and are non-refundable unless due to our error.

International buyers welcome, but inquire first. We have satisfied customers in Argentina, Australia, Austria, Belgium, Bermuda, British Virgin Islands, Canada, Chile, China, Democratic Republic of Congo, Democratic Republic of Congo, Denmark, England, France, Germany, Greece, Holland, Iceland, Ireland, Israel, Italy, Japan, Kuwait, Mexico, New Zealand, Norway, Nova Scotia, Saudi Arabia, Scotland, Singapore, Spain, Sweden, Thailand, United Arab Emirates, USVI and the Eastern Caribbean.

ACCEPTED 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. No credit cards or PayPal accepted on big ticket items.

Buy this very special article of maritime history Now!

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