How to Make a Sextant

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  • Pub No.: 5572

From everyday materials. Two designs by W.E. Partridge and Sam Rabl

From the Partridge Article: "Owing to the increase of offshore racing and cruising the practice of navigation has begun to interest numbers of yachtsmen, and the study of the art is becoming a popular form of amusement. But in order to thoroughly study the art, it is necessary to have certain tools, the chief of which being what is called a sextant or  quadrant, an instrument employed to measure angles. The whole science of navigation is based upon the measurement of angles. But unfortunately these instruments are, owing to delicacy of construction, extremely expensive, especially in the United States, where their manufacture is heavily taxed. This prevents the average young yachtsman from having one. Had he such an instrument he would soon become familiar with its use and find the employment of it giving added pleasure to his voyaging. It is impossible to make a cheap sextant that can be relied upon to give accurate service under all conditions, especially if the frame is of wood, as the expansion and contraction of the material will affect the reading of the arc to the extent of several minutes, if not degrees. And it is not to be expected that one built from these plans will successfully compete with a Kew certificate machine, but by making and using it, you will thoroughly learn what a sextant is  and how it is employed. " Includes full-size plate for vernier.

58 pages, 1 plate(s)

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