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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























































































