. comptesrendusheb1201131895acad. es naturelles. ( 3i3 ) » IjA ftg. I représente schématiqiiement l'applicntion de la méthode à la mesure du flux d'un projecteur M, éclairé par un arc électrique A, dont un petit écran B empêche les rayons directs de tomber snr l'écran dif- Fis Fig. â \. 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, bookdecade1890, bookpublisher, bookyear1895