Excerpt from Annales de Chimie Et de Physique, 1851, Vol. 32 Une premi???re Op???ration consiste ??? mesurer le diam???tre du tube au point o??? s'arr???te l'ascension du liquide. Une lunette microm???trique, ou cath???tom???tre, qui rendait appr??? ciable un centi???me de millim???tre, a servi ??? mesurer les diam???tres des plus gros tubes. A cet effet, on pla???ait la section du tube au foyer de la lunette, et l'on mesurait exactement le diam???tre vertical. En changeant le tube de position et en mesurant ainsi ...
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Excerpt from Annales de Chimie Et de Physique, 1851, Vol. 32 Une premi???re Op???ration consiste ??? mesurer le diam???tre du tube au point o??? s'arr???te l'ascension du liquide. Une lunette microm???trique, ou cath???tom???tre, qui rendait appr??? ciable un centi???me de millim???tre, a servi ??? mesurer les diam???tres des plus gros tubes. A cet effet, on pla???ait la section du tube au foyer de la lunette, et l'on mesurait exactement le diam???tre vertical. En changeant le tube de position et en mesurant ainsi plusieurs diam???tres, on en concluait le diam???tre moyen. Pour les tubes fins on a successivement essay??? et rejet??? diff???rents proc???d???s, et, apr???s plusieurs essais on a donn??? la pr???f???rence au microscope arm??? d'un microm???tre par faitement divis???. Quelque confiance que paraisse m???riter le mode de mesure qui consiste ??? calculer le diam???tre d'a pr???s la longueur et le poids d'une colonne de mercure ia troduite dans le tube on a cru devoir le rejeter, parce qu'il ne fait pas reconna???tre l'ellipticit??? presque constante des tubes, non plus que les l???g???res irr???gularit???s d???pendantes de leur fabrication. Le microscope, au contraire, ampli fiant la section du tube ??? volont???, permet de la dessiner exactement au moyen de la chambre claire; et, en substi tuant au tube un disque de verre sur lequel est trac??? un millim???tre divis??? en 100 parties, on superpose, toujours au moyen de la chambre claire l'image du millim???tre di vis??? sur celle du contour de l'ouverture trac???e sur le papier. 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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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.