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Les Plantes Etudiees Au Microscope [FRE]

Excerpt from Les Plantes Etudiees au Microscope Quand on veut observer, on place l'instrument fixe ment sur sou pied, generalement rempli de plomb s'il est construit a bascule, ce qui lui donne du poids et assure sa fixite. Le tube porte l'oculaire a sa partie supe rieure, et l'objectif au bas; il est construit de facon qu'on puisse eloigner a volonte de l'objet soumis a l'observation l'ensemble de lentilles auxquelles il sert de monture; un frottement doux ou une cremaillere permet d'atteindre ce but. Au-dessous se trouve une petite tablette, la platine, qui est destinee a recevoir les sujets soumis a l'observation. Elle porte deux pinces, dites valets, delicate miniature de ceux des menuisiers, pour fixer le porte-objet. L'eclairage, point capital dans l'usage de l'instrument, se fait au moyen d'un miroir plan pour les faibles grossissements, concave pour les plus forts; ses articulations sont disposees de telle sorte qu'il soit aise de lui faire prendre toutes les positions. On aura soin de graduer l'eclairage de facon qu'il ne soit ni trop faible ni tr0p intense; dans le premier cas on voit mal, dans le second il blesse la vue. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
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