Portland Course Plotter
Dit is een kartonnen zelfbouw pakket.
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This is a very clever laminated cardboard kit with real mirrors and an adjustable sun shade.
It should take a little more than an hour to construct, and when done yields a remarkably accurate instrument. The manufacturer claims an accuracy of better than 8 minutes of arc. It is certainly not weatherproof, but should be fun and educational to build. It comes with a very good brochure explaining the uses of the sextant, and includes a perpetual almanac of the sun. Thus, you have everything you need to build it and use it.