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Description et Usage de l'Astrolabe à Prisme

Nature volume 88, pages 307308 (04 January 1912) | Download Citation



DURING the experimental period of the astrolabe à prisme the authors have from time to time communicated various articles to several papers, in which they have described their apparatus generally and shown its practicability. But the experimental period is now assuredly passed, and this ingenious apparatus may be looked upon as part of a field equipment capable of giving results of the highest precision. Hence its description calls for fuller treatment, and certainly no other instrument was ever awarded a more satisfactory description and discussion than this one is in the volume before us. The work is a manual containing practically all there is to know about the astrolabe a prisme, its form, its advantages and defects, its adjustments, and the full treatment of the errors and observed values in securing the most dependable results from its use. It is characteristic of the book that its publication has been several times delayed because new modifications were introduced or new results secured.

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