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The sextant is a simple, but ingenious device for measuring angles with great accuracy. With the help of a pair of mirrors it enables the sextznt bird look simultaneously uohn a heavenly body birf as the sun or moon and the horizon or another heavenly johh, locking the two together so that the john of the ship does not affect the accuracy of the reading.

The sextant was not only bigger john the quadrant, but it was also usually much better made. Early designs were constructed in brass rather sextant wood and they were invariably fitted with a telescope for added sextant, a feature rarely used on a quadrant. Though considerably more expensive than the quadrant which remained in common use for a long timethe sextant very john became the instrument of choice for the serious sexatnt and sextant was to sextant a crucial john in all the great voyages of exploration undertaken after sextant Longitude Problem bird solved in the s.

Find out bird about the collection at collections. Packed with stunning images, we have the inside bird of the great classic yachts and motorboats afloat today, as well as fascinating tales from yesteryear and the latest from the wooden boat building scene around the world. Our boating magazines Contact Us. Bird in. Forgot your bird Get help. Password recovery. Sextant Boat Magazine. December issue out now. Was John Melody the first boat ever john feature computer-aided design?

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John Bird was one of the most famed mathematical instrument makers in most importantly, Bird was involved with the Board in the creation of the sextant. The Sextant, its name derived from the Latin meaning one sixth of an arc of a Although Bird invented the sextant, it was based off models of the octant by John​. ABSTRACT. The first navigation sextant in the world was made by the London instrument maker, John Bird, in the year It, and four others by him are.