. Annual report of the American Scenic and Historic Preservation Society to the legislature of the State of New Astrolabe The above drawing is based on Champlains astrolabe which is in thevaluable private collection of Mr. Samuel V. Hoffman, President of theNew York Historical Society. The original instrument, which is 5% inchesin diameter, is too dark with age to be photographed satisfactorily. Seepage 278. s Plumb-line Quadrant of Early Seventeenth Century. Quadrant and photograph by author. Impersonation by Mr. ReginaldPelham Bolton. This quadrant is made after a figure in The Seaman
. Annual report of the American Scenic and Historic Preservation Society to the legislature of the State of New Astrolabe The above drawing is based on Champlains astrolabe which is in thevaluable private collection of Mr. Samuel V. Hoffman, President of theNew York Historical Society. The original instrument, which is 5% inchesin diameter, is too dark with age to be photographed satisfactorily. Seepage 278. s Plumb-line Quadrant of Early Seventeenth Century. Quadrant and photograph by author. Impersonation by Mr. ReginaldPelham Bolton. This quadrant is made after a figure in The SeamansSecrets by Capt. John Davis (1G07). By sighting on an object throughthe two sights affixed to one side of the quadrant, the angle is indicatedby the plumb-line on the graduated arc. This quadrant is graduated fromzero (nearest the observer) to 90° and indicates the angle from the figure of a similar quadrant in Les Usages du Quadrant by JeanTarde (1627) is graduted in the opposite direction and indicates the anglefrom the horizon. Davis method saves one step in computing page 279. Fiftee
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmonumen, bookyear1901
