. comptesrendusheb1051887acad. es naturelles. ( (569 ) » La fig. 1 correspond au cas où le plan île jirojeclion e';l vertical et perpendicu- laire au méridien magnétique. Fig. --. » Dans la fig. 3, le plan de projection est horizontal e't passe par l'axe de rotation de l'aiguille. Fis. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original nce Periodicals; dicals.

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Keywords: ., book, bookcentury1800, bookdecade1880, bookpublisher, bookyear1887