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 Minature Brass Sextant US $120.00 
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 10" SEXTANT SOLID BRASS NAUTICAL Survey, Ship Telescope - PIRATE NAVIGATION b US $42.99
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 4" German BRASS SEXTANT NAUTICAL MARINE INSTRUMENT Maritime Marine gifts, US $23.99
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 50 x NAUTICAL BRASS SEXTANT FOR KEY CHAIN COLLECTIBLE MARINE Fancy Keychain Gift US $81.99
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 1.5" Solid Brass Pocket Compass and 3" Brass SEXTANT Lowest Discount Price 6 c US $24.99
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 MARITIME GERMAN MARINE SEXTANT, 8" BRASS SEXTANT US $59.00
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 GERMAN MARINE BRASS NAUTICAL SEXTANT, BRASS SEXTANT US $55.00
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 4" BRASS NAUTICAL GERMAN MARINE SEXTANT, BRASS SEXTANT US $49.99
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 GREAT MARITIME BRASS SEXTANT WITH WOODEN B0X, 3" SOLID BRASS SEXTANT NAVIGATION US $49.00
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 SEXTANT 4" BRASS ~ NAUTICAL ~ MARITIME DECOR ~ NAVIGATION TOOL ~ PIRATE US $27.25
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 8" SEXTANT BRASS IN WOODEN BOX ~ NAUTICAL ~ MARITIME DECOR ~ PIRATE ~ US $84.99
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 6" SEXTANT BRASS IN WOODEN BOX ~ NAUTICAL ~ MARITIME DECOR ~ PIRATE ~ US $59.99
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 9" SEXTANT BRASS IN WOODEN BOX ~ NAUTICAL ~ MARITIME DECOR ~ PIRATE ~ US $92.50
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 7" SEXTANT BRASS IN WOODEN BOX ~ NAUTICAL ~ MARITIME DECOR ~ PIRATE ~ US $72.99
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 Nautical Sextant -solid brass nautical sextant- 3" pocket German Pattern sextant US $24.99
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 Nautical Sextant Brass Navigational Tool-5" x 4.5" x 2.5" in Nice Wooden Case US $64.95
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 BRASS SEXTANT/ESSEX BRASS CLASSIC NAUTICAL TOOL/NEW IN BOX/BOX WEAR/MADE IN INDI US $34.77
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 9" solid brass sextant in wooden case. Half price sale!!! US $38.00
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 German Brass Slow Motion Sextant with Box & Two Lenses US $89.00
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 6" NAUTICAL-BRASS SEXTANT WITH WOODEN BOX US $49.99
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 HENRY BARROW & Co. Marine Sextant - BRASS - Best for Marine/Nautical Collector US $139.99
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 4" Nautical Brass Sextant w/ Box - Sextent Astrolabe US $29.99
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 1.5" Solid Brass Pocket Compass and 3" Brass SEXTANT Lowest Discount Price 6 b US $24.99
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 10" SEXTANT SOLID BRASS NAUTICAL Survey, Ship Telescope - PIRATE NAVIGATION a US $42.99
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 3 x GERMAN BRASS SEXTANT 3" HOME Office DECOR COLLECTIBLE NAUTICAL Colletibles US $83.99
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 3" SEXTANT SOLID BRASS NAUTICAL Survey, Ship Telescope - PIRATE NAVIGATION Gift US $19.99
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 4" BRASS SEXTANT German NAUTICAL Survey MARINE INSTRUMENT Maritime Gift items US $44.00
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 4" SEXTANT SOLID German BRASS NAUTICAL,MARINE INSTRUMENT,Martitme Gifts! US $39.99
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 4" SEXTANT German SOLID BRASS NAUTICAL Survey,MARINE INSTRUMENT, #Maritime Gift* US $28.99
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 6" BRASS SEXTANT - with Wood Box Collectible, Colletable NAUTICAL ASTROLABE Gift US $59.99
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 6" SEXTANT SOLID BRASS NAUTICAL MARINE INSTRUMENT, Fancy Marine Maritime Gift US $59.99
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 9 x GERMAN BRASS COLLECTIBLE SEXTANT 3" NAUTICAL Colletable HOME Office DECOR US $215.99
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 SEXTANT 4" BRASS IN WOODEN BOX NAUTICAL MARITIME DECOR COLLECTIBLE ASTROLABLE US $69.99
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 LARGE 8" ANTIQUE BRASS NAUTICAL SHIP SEXTANT WITH WOOD CASE NAUTICAL SEXTANTS US $119.00
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 Buy Now New Sextant Brass On Compass To Impress The Guests US $41.90
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 Buy Now New Sextant Brass With Wooden Box Nautical Beauty Easy To Use US $45.05
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 ANTIQUE BRASS NAUTICAL LIFEBOAT SEXTANT WITH WOOD CASE US $59.00
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 Buy Now New Sextant Brass With Wooden Case All Time Craze Of Maritime Collectors US $84.00
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 Buy Now New Nautical Sextant - Solid Brass Stand Alone Navigational Sextant US $63.00
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 4" Brass Sextant Nautical Instrument For Maritime US $26.68
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 Antique Maritime brass sextant 6" kelvin hughes replica US $29.99
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 Buy Now New Sextant Brass With Wood Case All Time Nautical Gift For Anyone US $124.74
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 BRASS SHIP SEXTANT NAUTICAL SEXTANT WITH BEAUTYFULL WOODEN BOX US $65.99
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 COLLECTABLE BRASS NAUTICAL GERMAN MARINE SEXTANT 3" US $29.99
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 COLLECTABLE BRASS NAUTICAL GERMAN MARINE SEXTANT 4" US $44.99
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 Brass Sextant Late 1800's Early 1900's Buff & Buff Boston US $190.99
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 Scout's Brass Sextant 4" Brass Sextant Cape Cod Decor US $29.99
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 BRASS 4" SEXTANT w/Wooden Box ASTROLABE - BARGAIN! US $9.99
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 9in Brass ROSS LONDON Micrometer Working Sextant in Box US $159.99
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 Working ROSS LONDON Brass 9in Slow Motion Sextant wBox US $138.99
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 Slow/Fast Motion 6in WORKING Brass ROSS LONDON Sextant US $109.99
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 5 in Brass Working Rack Pinon Sextant NICE GIFT Item US $39.99
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 Slow/Fast Motion 6in WORKING Brass ROSS LONDON Sextant with Box US $69.99
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 BRASS NAUTICAL 4" ANTIQUE GERMAN MARINE SEXTANT GIFT 1917 Kalvin & Hughes London US $39.99
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 NAUTICAL MARITIME BRASS SEXTANT ` BRASS NAUTICAL GERMAN MARINE SEXTANT US $29.99
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 4 " NAUTICAL MARITIME BRASS SEXTANT ` BRASS NAUTICAL GERMAN MARINE SEXTANT US $35.00
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 watking & sons Brass ship Nautical sextant LONDON 1905 -SHINY SEXTANT FOR XMAS US $49.99
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 Antique Reproduction Vernier Readout Serialized British Captain's Brass Sextant US $89.00
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 BRASS NAUTICAL 3" ANTIQUE GERMAN MARINE SEXTANT GIFT 1917 Kalvin & Hughes London US $39.99
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 4" NAUTICAL-BRASS SEXTANT WITH WOODEN BOX US $25.00
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 9" NAUTICAL-BRASS SEXTANT WITH WOODEN BOX US $77.99
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 10" NAUTICAL BRASS SEXTANT WITH WOODEN BOX US $121.99
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 Beauteous Brass Sextant US $70.00
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 NICE BRASS SEXTANT 7x7 INCHES US $9.99
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 EB- VINTAGE BRASS ROSS LONDON SEXTANT US $895.00
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 CASED BRASS & GLASS SEXTANT MARKED STANLEY 1884 US $74.95
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 6" BRASS SEXTANT with Wood Box Collectible, Colletable NAUTICAL Hobby Gift Item US $59.99
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 Vintage British Navy Ship's Nautical Brass Sextant Box Surveying instrument rep US $49.99
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 BRASS NAUTICAL SEXTANT W/WOODEN BOX MARINE COLLECTIBLE SEXTANT W/BOX PROP GIFT US $43.65
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 4" SEXTANT - Brass with Wood Box - ASTROLABE SEXTENT US $38.21
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 BRASS GERMAN SEXTANT IN ANTIQUE STYLE NAUTICAL NAVIGATIONAL COLLECTIBLE PROP US $100.53
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 NAUTICAL BRASS GERMAN SEXTANT WITH GLASS WOODEN BOX COLLECTIBLE GIFTS US $42.95
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 3" WILLIAM JONES POCKET LIFEBOAT BOX SEXTANT. HEAVY BRASS - FULLY FUNCTIONAL US $99.99
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 NAUTICAL BRASS SEXTANT WITH GLASS WOODEN BOX COLLECTIBLE NAUTICAL/DECORE US $27.51
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 VINTAGE BRASS SEXTANT WITH LEATHER CASE COLLECTIBLE US $21.11
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 NAUTICAL BRASS SEXTANT WITH WOODEN BOX COLLECTIBLE NAUTICAL/DECORE US $18.33
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 Nautical Solid Brass Sextant With Inlaid Wooden Box US $12.83
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 Nautical Solid Brass Sextant on Compass Antique US $19.27
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 NAUTICAL BRASS SEXTANT WITH LEATHER CASE COLLECTIBLE GIFTS US $18.33
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 VINTAGE BRASS STANLEY SEXTANT LONDON,ENGLAND US $93.00
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 ROYAL NAVY Marine Sextant - BRASS - Best for Marine/Nautical Collector US $99.99
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 Polished Solid Brass Rack and Pinion Sextant- 8 Inch Nautical Sextant in shiny US $49.99
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Brass Sextant
Graceful Drawing & Engineering Surveying by Ibrahim
Engineering surveys are particularly useful to gain the actual values of variables under study, and the relationship bonding among them. Surveys are suitable as a balance to other observations. This adds knowledge through "triangulation" as one of several methods.
Survey approach has the following strengths and weaknesses:
Strengths:
Surveys are easy to administer.
Surveys are simple to score and code.
Surveys determine the values and relations of variables and constructs.
Surveys can be reused easily, and provide an objective way of comparing responses over different groups, times, and places.
Weaknesses:
Surveys are just a snapshot of behavior at one place and time.
They do not provide as rich or "thick" description of a situation as a case study. They do not provide as strong evidence for causality between surveyed constructs as a well designed experiment.
The survey activities can be considered with the need of a detailed check list to be followed in the development and use of necessary survey instruments.
Among these significant steps are:
Determination of the unit of analysis (e.g., the individual, group, or organization)
Pre-testing and use of pilot data
Assessment of reliability
Random sampling from a defined sample frame.
Determination of statistical power of the final analysis.
Instruments used in Surveys:
Aluminum Sextant
Anchor Clock
Antique Compass
Antique Magnifier
Antique Survey Instrument
Ball Watch
Binoculars
Brass Diver's Helmet
Brass Nautical Lamp
Brass Sand Timer
Hand Kaleidoscope
Magnifying Glass
Marine Binocular
Marine Clock
Navigation Telescopes And Binocular
Nautical Lantern
Nautical Microscope
Nautical Mirror
Theodolites
Wooden Binocular
There are very few repair centers for the survey instruments because many instruments are imported from different countries or the qualified engineers are called from Western countries.
One of the few repair centers of survey instruments is 'Graceful Drawing & surveying'. This repair center deals in almost all kinds of survey instruments, for purchase of survey instruments, repairs and also updating in the hardware of the instrument. Having state of the art equipments to quickly diagnose and repair instruments and skillful and experienced working staff to give 100% quality service to not to let down customers' immediate demands rental rates.
'Graceful Drawing & Surveying' also handles orders relating to repairs of Multimedia Projectors, Overhead Projectors, Digital Cameras and other Commercial Electronic equipments.
GDS is a well known Survey equipment sales and service provider, and experts in all kind of survey and multimedia equipments. GDS provides the solution for GPS, Theodolites and etc. Khizer Hayat is owner of the GDS, and one of the best Engineer in Pakistan. Call Now. for more details. Tel: GDS +92-21-2028051 & Cell: +92-0321-2491691
Article Source: http://www.earticlesonline.com/Article/Graceful-Drawing---Engineering-Surveying/160846
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Frequently Asked Questions...
Antique brass sextant marked "Allan London"?
Trying to find any information on this particular sextant that would help me determine when it was made and ultimately, its value.
Thank you, I am already aware that James Allan was an instrument maker from London. For some time, there was a partnership between Worthington and Allan but this instrument is signed simply "Allen London". I am wondering at what time did Allan produce sextants on his own? Are there any good references that I could find out more details about Allan's work?
Please note: the signature is "Allan" not "Allen"
Answer:
Check Google first:
http://historydb.adlerplanetarium.org/signatures/edit.pl?edit_id=270
I know it says planerarium... but it is about your sextant
